Morphostenophanes furvus Zhou

Zhou, De-Yao, 2020, A revision of the genus Morphostenophanes Pic, 1925 (Coleoptera, Tenebrionidae, Stenochiinae, Cnodalonini), Zootaxa 4769 (1), pp. 1-81 : 59-62

Morphostenophanes furvus Zhou , new species ẈŖẎȐAEƤ

( Figs. 37 A–D; 39C, G, K, O; 40C, E, F, P–R; 41C, G)

Type materials. CHINA: Yunnan: ♂ (Holotype, SNUC) , Diqing Prefecture, Weixi County, above Puduoluo , 27°7’58.27’’N, 99°6’26.39’’E, ca. 2900 m, 2017. xii–2018.ii, native collector. Paratypes (21♂♂, 19♀♀) : CHINA: Yunnan: 1♀ ( SNUC) , 2♂♂, 2♀♀ ( MHBU) , 7♂♂, 2♀♀ ( CZDY, one female was disassembled for generic char- acters examined, one male was preserved in 99.7% ethanol at –18 °C) , Diqing Prefecture , Weixi County, above

Puduoluo, 27°7’58.27’’N, 99°6’26.39’’E, ca. 2900 m, 2017. xii–2018.ii, native collector; 1♂, 1♀ ( CQL), Weixi County, Zhonglu Country , Lagaluo Village, 2018.vii.10, native collector ; 2♂♂, 8♀♀, Nujiang Prefrecture , Gong- shan County , Puladi Country, Xiqieluo, 2512 m, 2019.ii, native collector ; 9♂♂, 5♀♀ ( CZDY), Deqin County, Yunling Country , Yongzhi Village, 2019.iv, native collector .

Diagnosis. Body medium-sized to large, greyish-black, weakly shiny. Pronotum barrel-shaped. Elytra elongate oval, widest near middle, with aspect ratio about 1.83, with rows of round or oval segments of striae, some interrupted, each encircled area strongly or moderately convex. Female much wider than male, with aspect ratio of elytra about 1.73–1.84. Protibiae markedly thickened apically; inner margins of pro- and mesotibiae of male pubescent along apical half.

Description. Male ( Fig. 37A, C ). Color black, weakly shiny; antennae and claws reddish brown. Body elongate, length 20.5–22.8 mm, width 7.2–8.5 mm, strongly convex, markedly constricted between pronotum and elytra.

Head ( Fig. 39C, G ) transversely subquadrate, cephalic punctures small, sparsely scattered on frons, and becoming slightly denser on clypeus and genae; outer margin distinctly notched between genae and clypeus; clypeus transversely hexagonal, width-length ratio about 1.75, gently bent downwards in front, convex before middle of the frontoclypeal suture, anterior margin weakly emarginate in middle, clypeal transverse impression short, marked to absent; frontoclypeal suture deeply grooved, becoming weaker laterad, widely U-shaped; genae strongly raised, depressed before eyes, roundly produced anterolaterally; frons broad, vaguely wrinkled, anterior part gradually sloping forwards; eyes transversely reniform, strongly convex laterally; inner ocular sulci finely depressed along inner margins; tempora moderately convex. OI = 49.5–51.3. Antennae ( Fig. 40C ) slender, reaching basal third of elytra, with antennomeres weakly thickened to apices; relative lengths of antennomeres: 0.66: 0.34: 1.12: 1.19: 1.24: 1.21: 1.19: 1.14: 1.09: 1.00: 1.11. Mentum ( Fig. 39G ) square, lateral margins straight or weakly rounded; medial surface sparsely and coarsely punctate, with several large pores bearing long setae; gradually rising anteriorly, depressed along both sides.

Pronotum ( Fig. 39K ) barrel-shaped, PW/PL = 1.12–1.21, widest near middle, anterior margin nearly straight, slightly projecting in middle, with thin marginal border, interrupted in middle; lateral margins weakly rounded, lateral marginal borders thin, visible in dorsal view along anterior half; posterior margin emarginate in middle, posterior marginal border markedly presented; anterior angles rounded; posterior angles obtuse; disc strongly convex, shagreened, finely and sparsely punctate. Scutellum widely triangular, glossy, finely punctate.

Elytra elongate oval, widest near middle, EL/EW = 1.80–1.86; strongly convex, highest near basal 2/5; with rows of round or oval segments of striae, some interrupted or straight, encircled areas strongly or moderately convex; intervals shagreened and smooth, sparsely and finely punctate.

Prosternum ( Fig. 39O ) shagreened, finely and sparsely punctate; prosternal process declivous, apex truncate; hypomeron rugulose, shagreened. Metasternum finely wrinkled. Abdomen depressed, surface smooth, densely and finely punctate, with sternites III, IV and anterior 3/5 of V sulcate at both sides.

Legs slender. Protibiae ( Fig. 40P ) curved in apical third, apical half of inner margins pubescent; mesotibiae ( Fig. 40Q ) curved in apical third, apical half of inner margins pubescent, outer margins weakly depressed before apices; metatibiae ( Fig. 40R ) weakly sinuous, apical 3/5 of inner margins emarginate and pubescent, outer margins depressed before apices.

Aedeagus ( Fig. 41C ) elongate, curved in lateral view; parameres slender, ridged along dorsal midline, 0.21 as long as total length, with flabellate apex. Sternite VIII ( Fig. 41G ) with apical lobes each ovate in lateral view, superior margins projecting dorsad, exterior margins and inferior margins rounded.

Female ( Fig. 37B, D ). Wider than male, length 20.0– 23.1 mm. Distance between eyes wider, OI = 56.5; PW/PL = 1.16–1.24, elytra slightly wider than those of males, EL/EW = 1.73–1.84; much more convex, highest behind middle; abdomen straight in lateral view. Ovipositor elongate, gradually narrowing apically, apex of gonocoxite acute.

Comparative notes. Within the elegantulus -group, Morphostenophanes furvus is distinguished from M. gaoligongensis , and M. sinicus by its evenly black body without metallic luster, shorter antennae and legs, and more elongate basal piece. It is distinguished from M. elegantulus by its pronotum and elytra without reddish areas.

Distribution. ( Map 1 ). CHINA: Yunnan.

Etymology. The new species is named from a Latin epithet, ‘furvus’ referring to its dark body color.

Figures

Map 1. Distribution of the Morphostenophanes species. A. Enlargement of Central and Western Yunnan Province.

FIGURE 37. Habitus of Morphostenophanes furvus Zhou new species. Male (A, C), and female (B, D); in dorsal (A, B), and lateral view (C, D). Scale bars = 5 mm.

FIGURE 39. External characters of Morphostenophanes species in the elegantulus-group: M. gaoligongensis Zhou new species (A, E, I, M), M. sinicus Zhou new species (B, F, J, N), M. furvus Zhou new species (C, G, K, O), M. furvus weishanus Zhou new subspecies (D, H, L, P). Male heads in dorsal (A–D) and ventral view (E–H); male prothoraces in dorsal (I–L) and ventral view (M–P). Scale bars = 1 mm.

FIGURE 40. External characters of Morphostenophanes species in the elegantulus-group: M. gaoligongensis Zhou new species (A, H–L), M. sinicus Zhou new species (B, G, M–O), M. furvus Zhou new species (C, E, F, P–R), M. furvus weishanus Zhou new subspecies (D, S–U). Male antennae in dorsal view (A–D). Male elytra (E, F) and female elytra (G). Scutella (H, I). Male protibiae in dorsal view (J, M, P, S), mesotibiae in ventral view (K, N, Q, T), and metatibiae in dorsal view (L, O, R, U). Scale bars of A–G= 2 mm; H, I not to scale, J–U = 1 mm.

FIGURE 41. Anatomic structures of Morphostenophanes species in the elegantulus-group: M. gaoligongensis Zhou new species (A, E), M. sinicus Zhou new species (B, F), M. furvus Zhou new species (C, G), M. furvus weishanus Zhou new subspecies (D, H–K). Aedeagi (A–D) and male sternites VIII (E–H); in dorsal view (d), lateral view (l), and enlargements of paramere apices (p). Male spicula gastrale in lateral view (I, J). Ovipositors in lateral view (K, L). Scale bars = 1 mm; E, all paramere apices not to scale.