taxonID	type	description	language	source
C694BCF99B665CD3B9EEA2AE31C1F10E.taxon	description	Figs 15 C, 16 C, 17 C, 20 A, 21 A ‒ D	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
C694BCF99B665CD3B9EEA2AE31C1F10E.taxon	etymology	Etymology. The specific name is derived from the Latin bi - (two) and macula (spot), referring to its elytra with two black spots.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
C694BCF99B665CD3B9EEA2AE31C1F10E.taxon	diagnosis	Diagnosis. The species can be easily distinguished from all other species of Microichthyurus by the characteristic body coloration, in which elytra mostly yellow, black at humeri, and having a pair of small oblong black spots on disc. Also, its aedeagus is distinctive, with median lobe long sac-shaped, longer than left ventral paramere.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
C694BCF99B665CD3B9EEA2AE31C1F10E.taxon	description	Description. Body length: 5.2 mm; body width: 1.0 mm. Male (Fig. 20 A). Coloration. Body black, antennomeres I ‒ IV yellow ventrally, prothorax yellow, pronotum with a large black marking in center of disc; scutellum yellow; elytra brown at the part which near pronotum posterior margin and yellowed posteriorly, with a pair of black oblong spots in the middle. Eyes moderately large, interocular distance about 0.7 times as wide as diameter of an eye. Antennae extending to posterior margin of abdominal tergite IV, antennomeres II about 1 / 3 length of I, III about twice longer than II, IV ‒ X subequal and about 1.5 times longer than III. Pronotum 1.1 times wider than long, anterior margin slightly arcuate and posterior margin strongly bisinuate, lateral margins subparallel, anterior angles rounded, and posterior angles nearly rectangular. Elytra 1.2 times longer than wide, 1.7 times longer than pronotum, with lateral margins subparallel, sutures slightly dehiscent from the base, distance between sutures slightly wider than width of the elytron, apices rounded. Abdominal tergite VIII (Fig. 15 C) 1.3 times longer than wide, with lateral margins slightly arcuate, postero-lateral projections about half length of the tergite, and feebly sinuate at inner margins. Abdominal sternite VIII (Fig. 16 C) bilobed, with lateral portions nearly inverted triangular, as long as wide, broadly fused at basal half part, inner apical angles rounded and outer apical angles acute, each with a finger-like projection in middle of posterior margin. Proctiger (Fig. 17 C) semicircular, almost surrounded by paraproct and covered with a few long pubescence on surface. Paraproct (Fig. 17 C) subsquare and slightly emarginate in middle and dentated on both sides of posterior margin, around which covered with long pubescence, with tergal flange long and about 4.2 times as long as paraproct, basal 1 / 4 part strongly broadened and rhombic, nearly as long than wide, apical 3 / 4 part slender and bent inwards. Aedeagus (Fig. 21 A ‒ D): left ventral paramere rod-like, slender, and progressively thinned apically, rounded at apex (Fig. 21 A, D); left dorsal paramere short and lamellar, about half length of left ventral paramere, widely rounded at apical margin (Fig. 21 B); right paramere rod-like, as long as and thicker than left ventral paramere, acute at apex (Fig. 21 D); median lobe strongly sclerotized and 1.5 times longer than parameres, grooved at basal part, elongate sac-shaped at apical part, rounded at apex (Fig. 21 A ‒ D). Female. Unknown.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
C694BCF99B665CD3B9EEA2AE31C1F10E.taxon	distribution	Distribution. China (Hainan).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
2D2BB1BC180A5DB094D2ACB95EAB6E9B.taxon	description	Figs 6 B, 7 B, 8 B, 9 B, 10 E ‒ H	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
2D2BB1BC180A5DB094D2ACB95EAB6E9B.taxon	etymology	Etymology. The specific name is derived from the Latin crassus (thick) and cornus (horn), referring to its antennae broaden.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
2D2BB1BC180A5DB094D2ACB95EAB6E9B.taxon	diagnosis	Diagnosis. The species resembles M. quadratus sp. nov. in the shape of abdominal sternite VIII but can be easily distinguished from the latter by the following characters: abdominal sternite VIII of male (Fig. 8 B) with lateral portions converging posteriorly to each other, middle portion subparallel-sided and as long as wide; aedeagus with median lobe (Fig. 10 E, H) strongly sclerotized, pocket-shaped at apical part, strongly protruding at latero-apical portions. Unlike in M. quadratus sp. nov., abdominal sternite VIII of male (Fig. 8 A) with lateral portions diverging posteriorly from each other, middle portion slightly narrowed posteriorly and 1.5 times as long as wide; aedeagus with median lobe (Fig. 10 D) slightly sclerotized, stout tube-shaped at apical half, rounded at apex.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
2D2BB1BC180A5DB094D2ACB95EAB6E9B.taxon	description	Description. Body length: 4.0 ‒ 4.1 mm (4.0 mm in holotype); body width: 0.9 mm (0.9 mm in holotype). Male (Fig. 6 B). Coloration. Body black, but yellow at antennomeres I ‒ VI, clypeus, pro- and meta-coxae and trochanters, meso-coxae, trochanters, and basal half parts of femora. Eyes large, interocular distance about 0.6 times as wide as diameter of an eye. Antennae cylindrically thickened and extending posterior margin of abdominal tergite II; antennomeres II ‒ III subequal and about 1 / 3 length of I, IV ‒ XI subequal in length and about twice longer than III. Pronotum 1.1 times wider than long, anterior margin slightly arcuate and posterior margin nearly straight, lateral margins parallel, anterior angles rounded, and posterior angles rectangular. Elytra 1.3 times longer than wide, 1.8 times longer than pronotum, with lateral margins subparallel, sutures dehiscent from the base, distance between sutures nearly as wide as width of the elytron, apices rounded. Abdominal tergite VIII (Fig. 7 B) about 1.2 times longer than wide, with lateral margins slightly arcuate, postero-lateral projections about · 2 / 5 length of the tergite and nearly straight at inner margins. Abdominal sternite VIII (Fig. 8 B) trilobed, with lateral portions converging posteriorly to each other, very slender and about 4.0 times as long as basal width, hardly hooked at apex; middle portion nearly parallel-sided, as long as wide, slightly arcuate at posterior margin and rounded at latero-apical angles. Proctiger (Fig. 9 B) semioval, almost surrounded by paraproct and densely covered with long pubescence on surface. Paraproct (Fig. 9 B) semicircular and obviously bordered at lateral margins, slightly emarginate in middle of posterior margin, around which covered with long pubescence, with tergal flange long and about 3.0 times as long as paraproct, basal half part strongly broadened and 1.2 times longer than wide, acute at apical outer angles, bisinuate at outer margin and nearly straight at inner margin, present with an oblong bubble-shaped convex on surface, apical half part slender and bent inwards. Aedeagus (Fig. 10 E ‒ H): left ventral paramere slender and feebly bisinuate in dorsal and ventral views (Fig. 10 E, H), sharply hooked at apex (Fig. 10 E); left dorsal paramere extremely short and lamellar, about 2 / 5 length of left ventral paramere, rounded at apical margin (Fig. 10 E); right paramere nearly as long as left ventral paramere, slender and nearly straight in dorsal and ventral views, sharply hooked at apex (Fig. 10 E, H); median lobe as long as parameres, strongly sclerotized, grooved at basal part, pocket-shaped at apical part, distinctly protruding at latero-apical portions, both protrusions very slender and nearly straight, subequal in length and acute at apices (Fig. 10 E, H). Female. Unknown.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
2D2BB1BC180A5DB094D2ACB95EAB6E9B.taxon	distribution	Distribution. China (Yunnan).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
61E6F902105852AF8B13EABBB366371E.taxon	description	Figs 1 C, D, 2 C, D, 3 B, 4 E ‒ H, 5 C, D	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
61E6F902105852AF8B13EABBB366371E.taxon	etymology	Etymology. The specific name is derived from the Latin falcatus (sickle-shaped, hooked, curved), referring to its median lobe of aedeagus with a horn-shaped protrusion.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
61E6F902105852AF8B13EABBB366371E.taxon	diagnosis	Diagnosis. The species resembles M. flavicollis Y. Yang, Liu & X. Yang, 2024, in the general shape of male abdominal sternite VIII and aedeagus, but can be easily distinguished from the latter by the following characters: pronotum dark brown (Fig. 1 C ‒ D); abdominal sternite VIII of male (Fig. 2 D) with lateral portions acute at latero-apical angles; median lobe of aedeagus (Lin et al. 2024 a: fig. 2 a, b) present with a horn-shaped protrusion (Fig. 4 E, H). Unlike in M. flavicollis, pronotum is uniformly yellow; abdominal sternite VIII of male (Lin et al. 2024 a: fig. 3 a) is rounded at latero-apical angles; median lobe of aedeagus (Lin et al. 2024 a: fig. 6 a) is present with a fork-shaped protrusion.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
61E6F902105852AF8B13EABBB366371E.taxon	description	Description. Body length (both sexes): 4.9 ‒ 6.8 mm (6.8 mm in holotype); body width (both sexes): 1.0 ‒ 1.6 mm (1.6 mm in holotype). Male (Fig. 1 C). Coloration. Body black, but yellow at antennomeres I ‒ II, coxae, trochanters, and bases of femora and apical parts of elytra, forming a pair of triangular yellow areas, as well as lateral margins of abdominal ventrites II ‒ VI. Eyes large, interocular distance about half as wide as diameter of an eye. Antennae extending to posterior margin of abdominal tergite II, antennomeres II about 1 / 3 length of I, III ‒ XI subequal in length and about twice longer than II. Pronotum 1.1 times wider than long, anterior margin arcuate, posterior margin slightly bisinuate, lateral margins subparallel, anterior angles rounded, and posterior angles nearly rectangular. Elytra 1.3 times longer than wide, 1.8 times longer than pronotum, with lateral margins sinuate, sutures slightly dehiscent from posterior 2 / 3 part, distance between sutures slightly wider than width of the elytron, apices rounded. Abdominal tergite VIII (Fig. 2 C) as long as wide, with lateral margins moderately arcuate, postero-lateral projections about 1 / 4 length of the tergite and straight at inner margins. Abdominal sternite VIII (Fig. 2 D) trilobed, with lateral portions nearly inverted triangular, as long as wide, inner and outer apical angles sharply projecting, each with an obtuse tooth at posterior margin; middle portion about 1.5 times as long as wide, feebly narrowed posteriorly, nearly straight at posterior margin, and acute and feebly projecting at latero-apical angles. Proctiger (Fig. 3 B) semicircular, slightly exceeding over paraproct, covered with short pubescence on surface. Paraproct (Fig. 3 B) twice wider than proctiger and feebly narrowed posteriorly, covered with slightly long pubescence along posterior margin, with tergal flange long and almost 4.0 times as long as paraproct, basal 2 / 5 part strongly broadened and subquadrate, which heart-shapely convex near outer apical angles, apical 3 / 5 part slender and bent inwards. Aedeagus (Fig. 4 E ‒ H): left ventral paramere rod-like, progressively thinned apically and feebly hooked at apex, moderately sinuate (Fig. 4 F, H); left dorsal paramere about 1.1 times longer than left ventral paramere, rod-like, progressively thinned apically and rounded at apex, feebly sinuate (Fig. 4 F, H); right paramere nearly as long as left ventral paramere (Fig. 4 F, G), abruptly thinned near apex and sharply hooked at apex (Fig. 4 E, H); median lobe strongly sclerotized, about 1.2 times longer than parameres, grooved at basal part, long cone-shaped at apical half, rounded at apex, present with a strongly sclerotized and horn-shaped protrusion on ventro-lateral part (Fig. 4 E, H). Female (Fig. 1 D). Similar to males, but body larger. Abdominal tergite VIII (Fig. 5 C) about 1.2 times longer than wide, with lateral margins arcuate at base, lateral projections about 1 / 4 length of the tergite, and slightly sinuate at inner margins. Abdominal sternite VIII (Fig. 5 D) about 1.2 times longer than wide, with lateral margins moderately converging posteriorly, posterior margin concave in middle, and latero-apical angles rounded.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
61E6F902105852AF8B13EABBB366371E.taxon	distribution	Distribution. China (Yunnan).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
DB1EED3CD7245C95A15FA89584795A84.taxon	description	Figs 14 C, 15 B, 16 B, 17 B, 18 E ‒ H	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
DB1EED3CD7245C95A15FA89584795A84.taxon	etymology	Etymology. The specific name is derived from the Latin flavus (yellow) and penna (feather), referring to its mostly yellow elytra.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
DB1EED3CD7245C95A15FA89584795A84.taxon	diagnosis	Diagnosis. The species resembles M. villosipes Y. Yang, Liu & X. Yang, 2024, in the habitus and the general shape of aedeagus but could be easily differentiated from the latter by the following characters: antennae normally filiform in male (Fig. 14 C); mesotibiae never covered with longer hairs in male (Fig. 14 C); abdominal sternite VII without any bulges or long setae in male; aedeagus with left dorsal paramere (Fig. 18 E) about 0.7 times length of left ventral paramere. Unlike in M. villosipes, antennae cylindrically thickened in male (Lin et al. 2024 a: fig. 9 a); male mesotibiae densely covered with longer and erected hairs in male (Lin et al. 2024 a: fig. 8 a); abdominal sternite VII with one bulge covered with long setae in male (Lin et al. 2024 a: fig. 8 b); aedeagus with left dorsal paramere 1.1 times longer than left ventral paramere (Lin et al. 2024 a: fig. 6 e, f).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
DB1EED3CD7245C95A15FA89584795A84.taxon	description	Description. Body length: 5.2 ‒ 5.6 mm (5.6 mm in holotype); body width: 1.0 ‒ 1.3 mm (1.3 mm in holotype). Male (Fig. 14 C). Coloration. Body black, but yellow at clypeus, antennomeres I ‒ III, scutellum, and apical half part and outer half part of elytra. Eyes large, interocular distance about half as wide as diameter of an eye. Antennae extending to the middle of abdominal tergite II, antennomeres II about half length of I, III ‒ X subequal in length and about half length of I, XI about 1.3 times longer than X. Pronotum 1.1 times wider than long, anterior margin slightly arcuate, posterior margin bisinuate, lateral margins subparallel, anterior angles rounded, and posterior angles nearly rectangular. Elytra 1.3 times longer than wide, 2.3 times longer than pronotum, with lateral margins sinuate, sutures strongly dehiscent from the base, distance between sutures wider than width of the elytron, apices rounded. Abdominal tergite VIII (Fig. 15 B) about 1.3 times longer than wide, with lateral margins slightly arcuate, postero-lateral projections about 1 / 3 length of the tergite and arcuate at inner margins. Abdominal sternite VIII (Fig. 16 B) bilobed, with lateral portions diverging posteriorly from each other, broadly fused at basal half part, each with a sharply hooked projection at apex, a triangular protuberance at middle of inner margin, surface coarsely punctate and covered with a few erected and stout setae in middle part. Proctiger (Fig. 17 B) semicircular, almost surrounded by paraproct and covered with a few long pubescence on surface. Paraproct (Fig. 17 B) semicircular and obviously bordered at lateral margins, slightly emarginate in middle of posterior margin, around which covered with long pubescence, with tergal flange long and about 3.5 times as long as paraproct, basal 1 / 3 part strongly broadened and nearly oval, nearly as long than wide, apical 2 / 3 part slender and bent inwards. Aedeagus (Fig. 18 E ‒ H): left ventral paramere slender and bisinuate in dorsal and ventral views, rounded at apex (Fig. 18 F, G); left dorsal paramere conical tube-shaped, short and about 0.6 times length of left ventral paramere, pointed at apex (Fig. 18 F); right paramere 1.1 times as long as left ventral paramere, narrowest in middle part, rounded at apex (Fig. 18 E, H); median lobe moderately sclerotized and as long as parameres, lamellar at basal part and elongate-tube shaped at apical half, rounded at apex (Fig. 18 F, G). Female. Unknown.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
DB1EED3CD7245C95A15FA89584795A84.taxon	distribution	Distribution. China (Guangxi).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
84107380FC6959D6BEEF836C05C973DD.taxon	description	Figs 14 A, B, 15 A, 16 A, 17 A, 18 A ‒ D, 19 A, B	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
84107380FC6959D6BEEF836C05C973DD.taxon	etymology	Etymology. The specific name is derived from the name of the type locality, Guangxi, China.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
84107380FC6959D6BEEF836C05C973DD.taxon	diagnosis	Diagnosis. The species resembles M. hubeiensis Y. Yang, Lin & Liu, 2024, in the habitus and the general shape of aedeagus but could be easily differentiated from the latter by the following characters: abdominal tergite VIII of male (Fig. 15 A) 1.1 times wider than long; abdominal sternite VIII of male (Fig. 16 A) with lateral portions phone-shaped, moderately emarginate in middle of inner margins, without any protrusions at apices; aedeagus with median lobe acute at one latero-apical portion and rounded at the opposite portion (Fig. 18 A, D). Unlike in M. hubeiensis, abdominal tergite VIII of male (Lin et al. 2024 a: fig. 4 c) is 1.1 times longer than wide; abdominal sternite VIII of male (Lin et al. 2024 a: fig. 3 c) with lateral portions is slender and bisinuate at inner margins, each present with a small and sharply hooked protrusion at apex; aedeagus with median lobe rounded at latero-apical portions (Lin et al. 2024 a: fig. 10 a ‒ d).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
84107380FC6959D6BEEF836C05C973DD.taxon	description	Description. Body length (both sexes): 4.5 ‒ 4.8 mm (4.8 mm in holotype); body width (both sexes): 0.9 ‒ 1.1 mm (0.9 mm in holotype). Male (Fig. 14 A). Coloration. Body black, but yellow at antennomeres I ‒ II and III ventrally, apical 1 / 3 parts of elytra, pro- and meso-coxae, trochanters, basal half parts of femora, meta-coxae, and trochanters. Eyes large, interocular distance about 0.4 times as wide as diameter of an eye. Antennae extending to posterior margin of abdomen tergite IV, antennomeres II about 1 / 3 length of I, III ‒ X subequal and about twice longer than II, XI about 2 / 3 length of X. Pronotum nearly as long as wide, anterior margin arcuate, posterior margin bisinuate, lateral margins subparallel, anterior angles rounded, and posterior angles nearly rectangular. Elytra 1.3 times longer than wide, 1.9 times longer than pronotum, with lateral margins subparallel, sutures slightly dehiscent from the base, the distance between sutures narrower width of the elytron, apices rounded. Abdominal tergite VIII (Fig. 15 A) 1.1 times wider than long, with lateral margins arcuate, postero-lateral projections about 1 / 3 length of the tergite, and feebly arcuate at inner margins. Abdominal sternite VIII (Fig. 16 A) trilobed, with lateral portions converging posteriorly to each other, phone-like and about 2.5 times as long as basal width, roundly emarginate in middle of inner margins, nearly rectangular at apices; middle portion 1.1 times wider than long, widened posteriorly, nearly straight at posterior margin, and rounded at latero-apical angles. Proctiger (Fig. 17 A) semicircular and narrowed posteriorly, completely surrounded by paraproct, obviously bordered along lateral margins. Paraproct (Fig. 17 A) semicircular and obviously bordered along lateral margins, slightly emarginate in middle of posterior margin, around which covered with a few slightly long pubescence (with tergal flange destroyed). Aedeagus (Fig. 18 A ‒ D): left ventral paramere strongly twisted, bisinuate in dorsal and ventral views (Fig. 18 A, D), bifurcate at apex (Fig. 18 A ‒ D); left dorsal paramere half-length of left ventral paramere, lamellar and widely rounded at apex (Fig. 18 B, D); right paramere about 4 / 5 length of left ventral paramere, strongly twisted, compresses laterally and abruptly thinned near apex, acute at apex (Fig. 18 A ‒ D); median lobe moderately sclerotized and 1.2 times longer than parameres, grooved at basal part and pocket-shaped at apical part, distinctly protruding on latero-apical portions, the protrusions stout (Fig. 18 A, D). Female (Fig. 14 B). Similar to males, but body larger, abdominal tergite VIII (Fig. 19 A) about 1.5 longer than wide, lateral projections about 1 / 6 length of the tergite and slightly arcuate at inner margins; abdominal sternite VIII (Fig. 19 B) about 1.2 times longer than wide, with lateral margins slightly converging posteriorly, posterior margin slightly arcuate, and latero-apical angles rounded.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
84107380FC6959D6BEEF836C05C973DD.taxon	distribution	Distribution. China (Guangxi).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
312CE2DEEEAA59EDA3F0D2818695398E.taxon	description	Figs 7 C, 8 C, 9 C, 11 A ‒ B, 12 A ‒ D, 13 A, B	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
312CE2DEEEAA59EDA3F0D2818695398E.taxon	etymology	Etymology. The specific name is derived from the Latin niger (black), referring to its black body.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
312CE2DEEEAA59EDA3F0D2818695398E.taxon	diagnosis	Diagnosis. The species resembles M. crassicornis sp. nov. in the general shape of abdominal sternite VIII and aedeagus but can be easily distinguished from the latter by the following characters: abdominal tergite VIII of male as long as wide (Fig. 7 C); abdominal sternite VIII of male (Fig. 8 C) with lateral portions less slender and about 3.0 times as long as basal width; aedeagus with median lobe moderately sclerotized, one protrusion slender and bent, distinctly longer than the other (Fig. 12 A, D). Unlike in M. crassicornis sp. nov., abdominal tergite VIII of male 1.2 times longer than wide (Fig. 7 B); abdominal sternite VIII of male (Fig. 8 B) with lateral portions is slenderer and about 4.0 times as long as basal width; aedeagus with median lobe strongly sclerotized, both protrusions subequal in length and nearly straight (Fig. 10 E, H).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
312CE2DEEEAA59EDA3F0D2818695398E.taxon	description	Description. Body length (both sexes): 5.5 ‒ 7.0 mm (5.7 mm in holotype); body width (both sexes): 1.0 ‒ 1.1 mm (1.1 mm in holotype). Male (Fig. 11 A). Coloration. Body black, only antennae and clypeus brown. Eyes large, interocular distance about half as wide as diameter of an eye. Antennae cylindrically thickened and extending to posterior margin of abdominal tergite II; antennomeres II about 1 / 3 length of I, III ‒ XI subequal in length and about twice longer than II. Pronotum 1.1 times wider than length, anterior margin strongly arcuate, posterior margin slightly arcuate, lateral margins parallel, anterior angles nearly rectangular, and posterior angles rounded. Elytra 1.4 times longer than wide, 1.6 times longer than pronotum, with lateral margins subparallel, sutures slightly dehiscent from the base, distance between sutures nearly as wide as width of the elytron, apices rounded. Abdominal tergite VIII (Fig. 7 C) as long as wide, with lateral margins slightly arcuate, postero-lateral projections about · 2 / 5 length of the tergite and straight at inner margins. Abdominal sternite VIII (Fig. 8 C) trilobed, with lateral portions converging posteriorly to each other, slender and about 3.0 times as long as basal width, feebly hooked inwards at apex; middle portion feebly longer than wide, feebly widened posteriorly, nearly straight at posterior margin, and rounded at latero-apical angles. Proctiger (Fig. 9 C) peach-like, almost surrounded by paraproct and covered with slightly long pubescence on surface. Paraproct (Fig. 9 C) semicircular and obviously bordered at lateral margins, slightly emarginate in middle of posterior margin, around which covered with slightly long pubescence (with tergal flange destroyed). Aedeagus (Fig. 12 A ‒ D): left ventral paramere slender and nearly straight in dorsal and ventral views (Fig. 12 A, D), obtusely hooked at apex; left dorsal paramere extremely short and lamellar, about half length of left ventral paramere, rounded at apical margin (Fig. 12 A); right paramere about 4 / 5 length of left ventral paramere, slender and nearly straight in dorsal and ventral views, sharply hooked at apex (Fig. 12 B, C); median lobe as long as parameres, moderately sclerotized, grooved at basal part, stout tube-shaped at apical part, distinctly protruding on one latero-apical portion, slightly protruding on the opposite portion, one protrusion slender and bent, distinctly longer than the other, both sharp at apices (Fig. 12 A, D). Female (Fig. 11 B). Similar to males, but body larger, antennae simple and filiform. Abdominal tergite VIII (Fig. 13 A) as long as wide, with lateral margins arcuate at base, lateral projections sharper, about 1 / 4 length of the tergite, and slightly sinuate at inner margins. Abdominal sternite VIII (Fig. 13 B) about 1.1 times longer than wide, with lateral margins slightly converging posteriorly, posterior margin straight in middle, and latero-apical angles nearly rectangular.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
312CE2DEEEAA59EDA3F0D2818695398E.taxon	distribution	Distribution. China (Yunnan).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
8DA99F50F1E550A2B7B9A5DAC1D08133.taxon	description	Figs 6 A, 7 A, 8 A, 9 A, 10 A ‒ D	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
8DA99F50F1E550A2B7B9A5DAC1D08133.taxon	etymology	Etymology. The specific name is derived from the Latin quadratus (square, squared), referring to its square pronotum.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
8DA99F50F1E550A2B7B9A5DAC1D08133.taxon	diagnosis	Diagnosis. The species resembles M. flavifemur Y. Yang, Lin & Liu, 2024, in the general shape of abdominal sternite VIII of male, but can be easily distinguished from the latter by the following characters: abdominal sternite VIII of male (Fig. 8 A) with lateral portions diverging posteriorly from each other, very slender and about 3.0 times as long as basal width, hooked at apices; aedeagus with left dorsal paramere (Fig. 10 B, C) extremely short, without long setae at apical margin. Unlike in M. flavifemur, abdominal sternite VIII of male (Lin et al. 2024 b: fig. 3 B) with lateral portions are parallel to each other, axe-shaped, and about 1.5 times longer than basal width, terminally abruptly constricted into a small hook at apex; aedeagus with left dorsal paramere (Lin et al. 2024 b: fig. 4 A, C, D) long and covered with a tuft of long setae at apex.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
8DA99F50F1E550A2B7B9A5DAC1D08133.taxon	description	Description. Body length: 4.0 mm; body width: 0.9 mm. Male (Fig. 6 A). Coloration. Body black, but yellow at antennomeres I ‒ III, coxae, trochanters, femora, and apical 1 / 5 parts of tibiae yellow, as well as apices of elytra. Eyes moderately large, interocular distance about 0.8 times as wide as diameter of an eye. Antennae extending to posterior margin of abdominal tergite IV, antennomeres II about 1 / 3 length of I, III ‒ XI subequal in length and about 1.2 times longer than II. Pronotum as long as wide, anterior and posterior margins nearly straight, lateral margins straight and parallel, anterior angles nearly rectangular, and posterior angles rounded. Elytra 1.3 times longer than wide, 1.7 times longer than pronotum, with lateral margins subparallel, sutures slightly dehiscent from the base, distance between sutures slightly wider than the elytron, apices rounded. Abdominal tergite VIII (Fig. 7 A) about 1.2 times longer than wide, with lateral margins slightly arcuate, postero-lateral projections about 2 / 5 length of the tergite, and sinuate at inner margins. Abdominal sternite VIII (Fig. 8 A) trilobed, with lateral portions diverging posteriorly from each other, very slender and about 3.0 times as long as basal width, inner apical angles rectangular and outer apical angles feebly hooked outwards; middle portion 1.5 times longer than wide, slightly narrowed posteriorly and rounded at latero-apical angles. Proctiger (Fig. 9 A) semicircular, triangularly emarginate in middle of posterior margin, and covered with a few long setae on surface. Paraproct (destroyed with tergal flange missing). Aedeagus (Fig. 10 A ‒ D): left ventral paramere rod-like, moderately sinuate, feebly hooked at apex (Fig. 10 B, C); left dorsal paramere extremely short and about 1 / 3 length of left ventral paramere, lamellar and slightly sclerotized, rounded at apical margin (Fig. 10 B, C); right paramere rod-like, about 1.1 times longer than left ventral paramere, moderately sinuate and thinnest in middle part (Fig. 10 B, C), feebly double-hooked at apex (Fig. 10 C); median lobe (Fig. 10 D) short and about half length of parameres, slightly sclerotized, grooved at basal part, stout tube-shaped at apical half, rounded at apex. Female. Unknown.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
8DA99F50F1E550A2B7B9A5DAC1D08133.taxon	distribution	Distribution. China (Yunnan).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
DE9C8F8F17715BA9A9A953BAC619647C.taxon	description	Figs 1 A, B, 2 A, B, 3 A, 4 A ‒ D, 5 A, B	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
DE9C8F8F17715BA9A9A953BAC619647C.taxon	description	Re-description. Body length (both sexes): 3.5 ‒ 3.8 mm; body width (both sexes): 0.8 ‒ 0.9 mm. Male (Fig. 1 A). Coloration. Body black, head and pronotum with blue metallic luster; antennomeres I ‒ III yellow; elytra gray at apical 1 / 3 parts; legs gray at coxae and trochanters; abdomen light yellow at anterior and posterior margins of ventrites II ‒ VI. Eyes strongly large, interocular distance about half as wide as diameter of an eye, head width across eyes distinctly wider than anterior margin of pronotum. Antennae extending to posterior margin of abdominal tergite IV, antennomeres II ‒ III, V, and VII subequal in length and about half length of I, III ‒ IV, and VIII ‒ X cylindrically thickened, IV about 0.8 times as long as III, VI about 1.2 times as long as V, VIII ‒ X progressively shortened, XI fusiform and about twice longer than X. Pronotum 1.2 times wider than long, anterior margin slightly arcuate, posterior margin strongly bisinuate, lateral margins slightly converging posteriorly, anterior angles rounded, and posterior angles nearly rectangular. Elytra as long as wide, 1.5 times longer than pronotum, with lateral margins subparallel, sutures strongly dehiscent from the base, distance between sutures nearly as wide as width of the elytron, apices rounded. Abdominal tergite VIII (Fig. 2 A) about 1.1 times longer than wide, with lateral margins nearly straight, postero-lateral projections about 1 / 3 length of the tergite and nearly straight at inner margins. Abdominal sternite VIII (Fig. 2 B) bilobed, with lateral portions converging posteriorly to each other, sickle-shaped and acute at apices, slender and 4.0 times as long as basal width, bisinuately emarginate at basal parts of inner margin, where covered with a few erected and stout setae. Proctiger (Fig. 3 A) peach-like, completely surrounded by paraproct, covered with some slightly long setae on surface. Paraproct (Fig. 3 A) well-developed, narrowed posteriorly, and shallowly emarginate at posterior margin, covered with a few long setae, with tergal flange extremely long, almost 4.0 times as long as paraproct, slightly wider at base, and bent inwards. Aedeagus (Fig. 4 A ‒ D): left ventral paramere rod-like, straight and slender, slightly swollen at apex (Fig. 4 A, B); left dorsal paramere about 1.3 times as long as left ventral paramere, very slender and spiral, acute at apex (Fig. 4 C); right paramere short and lamellar, about 2 / 5 length of left ventral paramere, widely rounded at apical margin (Fig. 4 C); median lobe moderately sclerotized, grooved at basal part and conical tube-shaped at apical half, rounded at apex, about half length of parameres (Fig. 4 A, B); internal sac elongate tube-shaped, on which surface densely covered with numerous short setae. Female (Fig. 1 B). Similar to males, but antennae simple and filiform. Abdominal tergite VIII (Fig. 5 A) about 1.2 times longer than wide, with lateral margins arcuate, lateral projections about 1 / 4 length of the tergite and slightly arcuate at inner margins. Abdominal sternite VIII (Fig. 5 B) about 1.1 times longer than wide, with lateral margins moderately converging posteriorly, posterior margin nearly straight, and latero-apical angles rounded.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
DE9C8F8F17715BA9A9A953BAC619647C.taxon	distribution	Distribution. Laos, Vietnam.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
1C0BC614AE7D511E8F77486A7E3D7464.taxon	description	Figs 15 D, 16 D, 17 D, 19 C, 20 B, 21 E – H	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
1C0BC614AE7D511E8F77486A7E3D7464.taxon	etymology	Etymology. The specific name is derived from the Latin strictus (narrow) and penna (feather), referring to its elytra narrowed posteriorly.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
1C0BC614AE7D511E8F77486A7E3D7464.taxon	diagnosis	Diagnosis. The species resembles M. villosipes in the abdominal sternite VII with one bulge covered with long setae in male, but could be easily differentiated from the latter by the following characters: antennae normally filiform in male; mesofemora normally slender and tibiae without any longer hairs in male (Fig. 20 B); aedeagus with left dorsal paramere as long as left ventral paramere (Fig. 21 E ‒ H). Unlike in M. villosipes, antennae are cylindrically thickened in male (Lin et al. 2024 a: fig. 9 a); mesofemora moderately swollen, and tibiae densely covered with slightly longer and erected hairs in male (Lin et al. 2024 a: fig. 8 a); aedeagus with left dorsal paramere long, 1.1 times longer than left ventral paramere (Lin et al. 2024 a: fig. 6 e, f).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
1C0BC614AE7D511E8F77486A7E3D7464.taxon	description	Description. Body length: 4.3 ‒ 4.4 mm (4.3 mm in holotype); body width: 1.0 mm (1.0 mm in holotype). Male (Fig. 20 B). Coloration. Body black, antennomeres I ‒ II brown, elytra light brown at apical 1 / 3 part. Eyes strongly large, interocular distance about 0.3 times as wide as diameter of an eye. Antennae extending to posterior margin of abdominal tergite II, antennomeres II about 1 / 3 length of I, III ‒ V subequal in length and about twice longer than II, VI slightly shorter than V, VII ‒ XI subequal in length and about 4 / 5 length of VI. Pronotum 1.1 times wider than long, anterior margin slightly arcuate and posterior margin bisinuate, lateral margins subparallel, anterior angles rounded, and posterior angles nearly rectangular. Elytra 1.1 times longer than wide, 1.8 times longer than pronotum, with lateral margins slightly sinuate, sutures dehiscent from the base, tapered at apices. Abdominal sternite VII (Fig. 19 C) strongly widened posteriorly, bulging in middle of posterior part, coarsely punctate, and covered with long and stout setae. Abdominal tergite VIII (Fig. 15 D) 1.5 times longer than wide, with lateral margins slightly arcuate, postero-lateral projections about · 2 / 5 length of the tergite and nearly straight at inner margins. Abdominal sternite VIII (Fig. 16 D) bilobed, with lateral portions diverging posteriorly from each other, oval and 1.1 times longer than wide, surface coarsely punctate and covered with a few erected and stout setae in middle part, inner angles widely rounded and outer apical angles sharply projecting, outer apical angles surface covered with some short pubescence, each with a club-like projection in middle of apical margin, surface covered with some erected and stout setae in middle part. Proctiger (Fig. 17 D) looking like bilobed, extending over paraproct. Paraproct (Fig. 17 D) semicircular and roundly emarginate in middle of posterior margin, around which covered with a few long pubescence, with tergal flange long and about 3.5 times as long as paraproct, basal 1 / 3 part bifurcate, apical 2 / 3 part slender and nearly straight. Aedeagus (Fig. 21 E ‒ H): left ventral paramere rod-like, feebly bisinuate, feebly hooked at apex (Fig. 21 E, H); left dorsal paramere as long as left ventral paramere, moderately sinuate, thinnest in middle part, feebly hooked at apex (Fig. 21 E, H); right paramere nearly as long as left ventral paramere, strongly twisted and spiral in ventral view, acute at apex (Fig. 21 E), compressed laterally and distinctly broadened at apical part, axe-like in lateral view (Fig. 21 F, G); median lobe moderately sclerotized and nearly as long as parameres, grooved at basal part, flattened sac-shaped, apex widely rounded (Fig. 21 E, H). Female. Unknown.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
1C0BC614AE7D511E8F77486A7E3D7464.taxon	distribution	Distribution. China (Hainan).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
67FF43DEB942550999F5CCD4D97E4023.taxon	description	Figs 7 D, 8 D, 9 D, 11 C, D, 12 E ‒ H, 13 C, D	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
67FF43DEB942550999F5CCD4D97E4023.taxon	etymology	Etymology. The specific name is derived from the Latin tertius (third), referring to its distinctive antennomere III.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
67FF43DEB942550999F5CCD4D97E4023.taxon	diagnosis	Diagnosis. The species resembles M. niger sp. nov. in the general shape of abdominal sternite VIII of male and aedeagus but can be easily distinguished from the latter by the following characters: basal antennomeres distinctly cylindrically thickened in male (Fig. 11 C); abdominal sternite VIII of male (Fig. 8 D) with lateral portions well delimited and keeled along inner margins, middle portion slightly narrowed posteriorly; aedeagus with right paramere beak-shaped at apex, median lobe with one protrusion (Fig. 12 E, H). Unlike in M. niger sp. nov., basal antennomeres moderately cylindrically thickened in male (Fig. 11 A); abdominal sternite VIII of male (Fig. 8 C) with lateral margins never ridged along inner margins, middle portion slightly widened posteriorly; aedeagus with right paramere acute at apex (Fig. 12 A, D), median lobe with two protrusions.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
67FF43DEB942550999F5CCD4D97E4023.taxon	description	Description. Body length (both sexes): 5.0 ‒ 6.5 mm (5.2 mm in holotype); body width (both sexes): 1.0 ‒ 1.1 mm (1.1 mm in holotype). Male (Fig. 11 C). Coloration. Body black, brown at antennomeres I ‒ IV, coxae, trochanters, and basal 1 / 3 parts of femora, as well as margins of abdominal segments II ‒ VI. Eyes large, interocular distance about half as wide as diameter of an eye. Antennae extending to posterior margin of abdominal tergite III, antennomeres I ‒ IV cylindrically thickened, III longest, I slightly shorter than III, II shortest and about 1 / 3 length of III, IV ‒ VII subequal in length and about 2 / 3 length of III, VIII ‒ XI subequal in length and slightly shorter than VII. Pronotum 1.1 times wider than length, anterior margin and posterior margin slightly arcuate, lateral margins parallel, anterior angles and posterior angles rounded. Elytra 1.4 times longer than wide, 1.8 times longer than pronotum, with lateral margins subparallel, sutures slightly dehiscent from the base, distance between sutures wider than the width of the elytron, apices rounded. Abdominal tergite VIII (Fig. 7 D) as long as wide, with lateral margins slightly arcuate, postero-lateral projections about half length of the tergite and straight at inner margins. Abdominal sternite VIII (Fig. 8 D) trilobed, with lateral portions converging posteriorly to each other, slender and about 4.0 times as long as basal width, acute at apex, well delimited and keeled along inner margins, inner apical angles feebly projecting and rounded; middle portion 1.2 times longer than wide, slightly narrowed posteriorly, tapered at posterior margin, and rounded at latero-apical angles. Proctiger (Fig. 9 D) weakly sclerotized and about half length of paraproct. Paraproct (Fig. 9 D) semicircular and obviously bordered around all margins, posterior covered with a few long pubescence around posterior margin (with tergal flange destroyed). Aedeagus (Fig. 12 E ‒ H): left ventral paramere slender and nearly straight in dorsal and ventral views (Fig. 12 E, H), sharply hooked at apex, strongly bent inwards and near parallel; left dorsal paramere extremely short and lamellar, about half length of left ventral paramere, rounded at apical margin (Fig. 12 E); right paramere about 4 / 5 length of left ventral paramere, slender and nearly straight in dorsal and ventral views, largely hooked and beak-like at apex (Fig. 12 E ‒ H); median lobe as long as parameres, moderately sclerotized, grooved at basal part, cone-shaped at apical part, distinctly protruding on latero-apical portion, the projection slender, bent, and acute at apex (Fig. 12 E, H). Female (Fig. 11 D). Similar to males, but body larger, antennae simple and filiform, I ‒ II yellow ventrally and black. Abdominal tergite VIII (Fig. 13 C) 1.1 times longer than wide, with lateral margins arcuate at base, lateral projections about 1 / 3 length of the tergite, and slightly sinuate at inner margins. Abdominal sternite VIII (Fig. 13 D) about 1.1 times longer than wide, with lateral margins slightly converging posteriorly, posterior margin straight in middle, and latero-apical angles rounded.	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
67FF43DEB942550999F5CCD4D97E4023.taxon	distribution	Distribution. China (Yunnan).	en	Lin, Hanqing, Liu, Haoyu, Yang, Xingke, Yang, Yuxia (2025): Taxonomy of the genus Microichthyurus Pic (Coleoptera, Cantharidae, Chauliognathinae), with descriptions of nine new species from China. Deutsche Entomologische Zeitschrift 72 (1): 27-56, DOI: 10.3897/dez.72.145885
