Elmomorphus schoenmanni, Selnekovič & Jäch & Kodada, 2024

Selnekovič, Dávid, Jäch, Manfred A. & Kodada, Ján, 2024, Taxonomic revision of the genus Elmomorphus Sharp, 1888. II. Redescription of the genus and review of the species from India, Nepal, Bhutan, Myanmar, China, Thailand, Laos, Cambodia, and Vietnam (Coleoptera: Dryopidae), European Journal of Taxonomy 957, pp. 1-229 : 182-184

Elmomorphus schoenmanni sp. nov.

urn:lsid:zoobank.org:act:8483BE43-4C4C-430D-B7B0-06A1E29A3564

Figs 89 , 91A , 114E

Differential diagnosis

Elmomorphus schoenmanni sp. nov. ( Fig. 89 ) is characterised by having the dorsal plastron confined to small areas around the antennal insertions. The elytral striae are distinctly impressed. The pronotal surface is smooth, not microreticulate as in E. schillhammeri sp. nov. and E. globosus sp. nov. The absence of microgranules on the pronotal disc and elytra and the absence of long erect setae on the labrum, prosternal process, and metaventrite in males distinguishes this species from E. ovalis sp. nov. and E. minutus sp. nov. The surface of the vertex is smooth, not microreticulate as in E. jii sp. nov. The microreticulation of the elytra is formed by relatively coarse transverse lines, whereas in E. jii and E. vietnamensis sp. nov. it is formed by irregular polygonal meshes. The pronotum is strongly convex, with the anterior angles strongly deflexed. The phallobase is rather long, and the parameres are strongly narrowed apically ( Fig. 91A ), PhL/PrL: 2.03 (n=1).

Etymology

The epithet is a proper noun in the genitive case honouring the exceptional collecting efforts of Dr Heinrich Schönmann (†), an Austrian entomologist of the NMW, who collected 18 new species of Elmomorphus in China, which equals 60% of the total number of species known from this country.

Type material

Holotype

CHINA – Guangxi Autonomous Region • ♂; “CHINA: SE-Guangxi Distr. Yulin Liuwan Mts . SW Yulin | 20.11.1993 120m, (26) [CWBS 49], leg. Schönmann ”; IAECAS.

Paratypes

CHINA – Guangxi Autonomous Region • 1 ♀; “CHINA, Guangxi 1993 10km N Liuzhou 10.11., 200m leg. Schillhammer (17) [CWBS 38]”; NMW • 1 ♀; same label data as for preceding, but “leg. L. JI ”; NMW .

Type locality

China, Guangxi Autonomous Region, Yulin Prefecture, Liuwan Da Shan; stream, ca 0.3–0.5 m wide, flowing through a rather flat area, rather sandy, ca 500 m a.s.l. (CWBS 49; Jäch & Ji 1995).

Description

Measurements (mm): TL: ♂ 2.98 (n =1), ♀♀ 3.07–3.21 (n=2); PL: ♂ 0.80 (n =1), ♀♀ 0.73–0.77 (n=2); PW: ♂ 1.53 (n =1), ♀♀ 1.55–1.63 (n =2); EL: ♂ 2.18 (n=1), ♀♀ 2.34–2.44 (n=2); EW: ♂ 1.74 (n=1), ♀♀ 1.79–1.91 (n= 2); PhL: 0.67 (n =1); PrL: 0.33 (n=1).

Body broadly oval, strongly convex dorsally ( Fig. 89 ). Integument black; mouthparts, antennae, and legs reddish brown. Pubescence consisting of very short, almost inapparent yellowish setae. Plastron covering anterolateral portions of frontoclypeus and ventral surface, except prosternal process, and median parts of metaventrite and ventrite 1.

Head on dorsal surface finely microreticulate, without microgranules, with small round punctures smaller than an eye facet, distance ca 0.5–1.0× puncture diameter. Labrum transverse, anterior margin broadly emarginate; surface microreticulate, with small round setiferous punctures; setae equal in length in both sexes. Anterior margin of clypeus straight. Eyes oval, interfacetal setae short; ID: ♂ 0.56 mm (n=1), ♀♀ 0.52–0.58 mm (n=2); APD/ID: ♂ 1.55 (n=1), ♀♀ 1.61–1.63 (n=2). Antennae 11-segmented, densely setose.

Pronotum transverse, strongly convex, PW/PL: ♂ 1.92 (n=1), ♀♀ 2.11–2.13 (n= 2); rim of anterior margin as wide as three eye facets, interrupted in middle; anterior angles strongly deflexed, prominent; lateral pronotal sides convergent, rounded; surface smooth, with round punctures, microgranules present in lateral portions. Prosternal process wider than long, lateral edges divergent, straight, posterior edge rounded; lateral portions rather wide, raised, without longer setae in males; median keel moderately arcuate. Scutellum as long as wide, with round punctures. Median part of metaventrite slightly convex, posteriorly widened; groups of long setae absent in both sexes. Elytra oval, strongly convex, widest at base of second fourth; EL/EW: ♂ 1.25 (n=1), ♀♀ 1.28–1.30 (n= 2). Dorsal surface with coarse microreticulation formed by short transverse lines and with small scattered punctures, and large deep punctures arranged in nine striae, punctures separated by about half a puncture diameter. Tibiae slightly curved; protibia ca 1.5× as long as protarsus, PrTL/PL: ♂ 0.90 (n= 1), ♀♀ 0.95–1.01 (n =2). Terminal protarsomere as long as three preceding tarsomeres combined.

Ventrites entirely covered with plastron, except for median part of ventrite 1 between two admedian keels. Ventrite 5 in males with triangular excision at apex, in females rounded. Aedeagus ( Fig. 91A ): phallobase expanded proximally, PhL/PrL: 2.03 (n =1); parameres curved ventrad, apices narrow, pointed (lateral aspect); penis apically rounded in lateral aspect.

Secondary sexual dimorphism

Ventrite 5 in males with triangular excision at apex, in females rounded.

Distribution

China (Guangxi) ( Fig. 114E ).

Figures

Fig. 89. Elmomorphus schoenmanni sp. nov., holotype, male (IAECAS), TL: 2.98 mm.

Fig. 91. A. Elmomorphus schoenmanni sp. nov., holotype (IAECAS), aedeagus, lateral aspect. B. E. vietnamensis sp. nov., paratype from type locality (CKB), aedeagus, lateral aspect. C. Same, ventral aspect. Scale bar: 0.1 mm.

Fig. 114. Distribution maps. A. Elmomorphus globosus sp. nov. B. E. ovalis Kodada, Selnekovič & Jäch sp. nov. C. E. minutus sp. nov. D. E. jii sp. nov. E. E. schoenmanni sp. nov. F. E. vietnamensis sp. nov.