Sinodorcadion liyanae, Wang & He, 2021

Wang, Cheng-Bin & He, Tian-Long, 2021, Sinodorcadion liyanae sp. n. from Guizhou, China (Coleoptera, Cerambycidae Lamiinae), Zootaxa 5039 (1), pp. 139-143 : 139-143

Sinodorcadion liyanae sp. n. 李Oi华ffiR牛

Figs. 1A–C ; 2A–F ; 3A–H

Type material. Holotype: ♂, CHINA, Guizhou, Tongren City, Jiangkou County, Fanjingshan [梵ớ山], alt. 2200 m, 17.VII.2017, Tian-Long He leg. (YZU) . Paratype: 2♂♂, same data as holotype except: alt. 2000 m, 2.VII.2021, Tian- Long He & Ping Wang legg. (YZU) .

Description. Holotype male. Body 7.8 mm long, widest around middle of elytra (2.7 mm). Length of particular body parts (mm): head (1.2), antenna (14.3), pronotum (1.9), elytra (4.7); width: head (1.9), pronotal apex (1.7), pronotal base (1.6), elytral humeri (2.2).

Habitus ( Figs. 1A–C ). Body oval. Integumentary color of body and appendages mostly dark brown; mandibles blackish; maxillary and labial palpi yellowish at apices; eyes blackish brown; antennomeres III–VIII orange-brown except apices, IX–XI almost orange-brown throughout. Body mostly clothed with dense, short, recumbent and yellowish pubescence, darker on scapes, pedicels and femora. Besides yellowish pubescence, prothorax inserted with several long, slender, erect and brown setae at lateral sides. Scutellum densely clothed with short, recumbent, golden-yellow pubescence. Elytra unevenly pubescent, partly denser, forming mottled maculae.

Head ( Figs. 1A–C ) subcylindrical, 1.5 times wider than long, widest after eyes, distinctly narrowed posteriorly. Vertex, frons and genae densely with coarse, deep and round punctures.Anteclypeus transverse, without setae or punctures; anterior margin straight. Frons wider than long, with a fine median groove extending from anterior margin to occiput. Eyes coarsely faceted, lower lobe suboval. Vertex moderately concave; antennal tubercles prominent, broadly separated.

Mouthparts. Labrum wider than long, convex and densely covered with yellowish setae dorsally; anterior margin emarginate. Mandible short, regularly arcuate at outer edge. Maxillary and labial palpi both with apices truncated, not expanded.

Antennae ( Figs. 1A–C ) rather long, 1.8 times as long as body, with apical six antennomeres exceeding elytral apices. Antennomeres with length ratio from scape to antennomere XI: 6.22: 1.00: 9.27: 6.45: 5.08: 4.17: 3.80: 3.36: 3.49: 3.03: 4.03. Scape subcylindrical, slightly thickening towards subapex, without coarse punctures, slightly shorter than antennomere IV. Pedicel knob-like, short, 1.1 times wider than long, distinctly thinner than scape. Antennomeres III–X straight, gradually decreasing in length, except IX longer than VIII and X. Antennomere III the longest, 1.4 times longer than pronotum, 1.5 times longer than scape, and 1.4 times longer than IV. Antennomere XI slightly arcuate, 1.3 times longer than X.

Pronotum ( Fig. 1A ) broader than long, 1.2 times as long as basal width, apex slightly wider than base, widest at lateral spines. Lateral spine mastoid, with rounded apex laterally directed. Surface convex, densely with coarse, deep and round punctures.

Scutellum ( Fig. 1A ) lingulate, apically rounded.

Elytra ( Fig. 1A ) oval, 2.2 times as long as humeral width, widest around middle. Humeral width 1.4 times wider than pronotal base. Lateral margins gently widened from humeri to middle, then gradually narrowing towards rounded apex. Surface with similar punctures as on head and pronotum, but sparser and coarser, attenuating apically. Metathoracic wings absent.

Legs ( Figs. 1A–C ). Femora fusiform, long; metafemora almost reaching abdominal apex. Tibiae sinuate, long, subequal to femora; mesotibia with a distinct indentation at apical 1/3. Tarsomere I the longest, but not longer than II+III; III deeply bilobed. Claws widely divergent.

Ventral side ( Fig. 1B ). Prosternum inconspicuously wrinkled, with several shallow coarse punctures laterally; prosternal process almost smooth, apically truncated. Mesosternum without coarse punctures; mesepisternum with several shallow coarse punctures; mesosternal process slightly convex at apex, apically truncated. Metasternum without coarse punctures; metanepisternum wedge-like, slightly tapering posteriorly, about 3.4 times longer than wide; anterior margin almost straightly oblique; ventral margin gently bisinuate.

Abdomen. Abdominal tergite VII gently emarginate at posterior margin; tergite VIII ( Fig. 2A ) subhexagonal, gently emarginate at posterior margin, apical 1/8 of dorsal surface and apical 2/3 of lateral margins with long setae. Abdominal ventrites without coarse punctures; ventrite VII gently emarginate at posterior margin; ventrite VIII ( Fig. 2B ) with apical sclerotized area transversely oblong, substraight at posterior margin; spiculum relictum ( Figs. 2A–C ) slender, about 3.5 times as long as apical area. Spiculum gastrale ( Figs. 2D–F ) with stem 2.2 times longer than branches; stem gently curved in lateral view ( Fig. 2F ).

Male genitalia. Tegmen ( Figs. 3A–B ) widest at middle, moderately curved ventrally in lateral view ( Fig. 3C ); parameres 2/7 length of tegmen, distinctly elongate, gradually convergent towards round apices, each apex with short setae of various lengths and long ones near apices ( Fig. 3D ); tegminal struts of connected basally. Median lobe ( Figs. 3E–F ) shorter than tegmen, distinctly curved ventrally in lateral view ( Fig. 3G ); dorsal plate ( Fig. 3H ) truncated at apex; ventral plate ( Fig. 3H ) longer than dorsal plate, spatulate at apical margin; basal struts ( Figs. 3E–F ) half length of median lobe.

Female. Unknown.

Etymology. The specific epithet is dedicated to Ms. Yan Li, the wife of the second author, for her constant support and love.

Distribution. China (Guizhou).

Differential diagnosis. The male of Sinodorcadion liyanae sp. n. is easily distinguished from other members in this genus by the combination of the following characters: body mostly clothed with yellowish pubescence; scutellum clothed with signally golden-yellow pubescence; elytra mottled with irregular maculae, without transverse pubescent band (only present in S. subspinicolle and S. zenghuaae ); maxillary and labial palpi not expanded at apices; antennae rather long, 1.8 times as long as body (besides the new species, only S. chinense and S. zenghuaae with antennae longer than or equal to 1.8 times of body length, other species not more than 1.5 times); scape without coarse punctures (only punctate in S. chinense , S. punctuscapum and S. zenghuaae ); prosternum with several coarse punctures laterally (also punctate in S. chinense , S. jiangi , S. magnispinicolle , S. punctulatum and S. punctuscapum ); meso- and metasterna without coarse punctures (punctate in S. chinense , S. magnispinicolle , S. punctulatum and S. punctuscapum ); mesepisternum with several coarse punctures; abdominal ventrites without coarse punctures (laterally punctate on first one or two abdominal ventrites in S. chinense , S. jiangi , S. magnispinicolle , S. punctulatum and S. punctuscapum ); parameres distinctly elongate (male genitalia were examined and illustrated by previous authors only in S. jiangi and S. punctuscapum , both with stout parameres).

Figures

FIGURES 1A–C Habitus of Sinodorcadion liyanae sp. n., holotype, ♂. (A dorsal view; B ventral view; C lateral view)

FIGURES 2A–F Sinodorcadion liyanae sp. n., holotype, ♂: A–C segment VIII; D–F spiculum gastrale. (A, E dorsal view; B, D ventral view C, F lateral view)

FIGURES 3A–H Male genitalia of Sinodorcadion liyanae sp. n., holotype: A–C tegmen; D parameres; E–G median lobe; H apical part of median lobe. (A, E dorsal view; B, F ventral view; C, G lateral view; D, H apicodorsal view)