Androsus pullus Ando & Yuan, 2021

Ando, Kiyoshi & Yuan, Cai-Xia, 2021, Nine new species of Cnodalonini (Coleoptera: Tenebrionidae) from Hainan Island with additional records of other Tenebrionidae, Zootaxa 4965 (2), pp. 321-338 : 326-328

Androsus pullus Ando & Yuan , sp. n.

( Figs. 11–13 , 15 )

Type material. Holotype: ♂, China, Hainan Is.: Main peak, Mt. Jianfengling , Jianfeng Township , Ledong County, 18˚42′N/108˚52′E, Alt. 1,000–1,300 m, Ɨ南省乐东s尖峰•尖峰岭主峰, 13–15.VII.2017, Local collector leg. ( HBUM).

Description. Body length: 5.0 mm in ♂ (n = 1). Proportions ♂ (n = 1): IE/TD 4.21; PW/PL 1.92; EL/EW 1.56.

Male. Oblong-oval, weakly convex above, subshiny. Colour dark reddish brown; dorsal surface black; mouthparts and basal seven antennomeres paler.

Head transverse, weakly convex posteriorly, with punctures very dense, large on frons and vertex, slightly smaller on clypeus and genae, piligerous on anterior portion of clypeus; mCG weakly sinuate; clypeus weakly and transversely convex, produced forwards, weakly rounded at apex; frontoclypeal suture rounded, rudimental in middle; genae depressed, distinctly reflexed along outer margins; frons broadened, gently convex, not elevated laterally along inner ocular sulci; eyes small, weakly convex, with inner ocular sulci short and tenuous, moderately deep. Antennae slender, reaching before base of pronotum; 7th to 10th antennomeres triangularly dilated and 11th short-oval; distal five antennomeres forming weak club. Ultimate maxillary palpomeres thick, weakly securiform. Mentum transversely subquadrate ( Fig. 11 ), depressed, with large and coarse setiferous punctures. Submentum inverted triangular, flattened, with coarse punctures.

Pronotum transverse, nearly twice as wide as long, widest at basal third, with fine microsculpture; disc weakly convex, feebly depressed along lateral margins, with punctures piligerous, dense and coarse, slightly larger than on frons; anterior margin roundly and deeply emarginate, not beaded; lateral margins evenly and steeply convergent forwards from the widest point and roundly convergent in basal third, gently and slightly coarsely beaded; basal margin gently bisinuate, not beaded; anterior angles acute, strongly produced, posterior ones obtusely angulate and not produced. Scutellum small, slightly convex, with coarse punctures.

Elytra oblong, gently convex, densely microsculptured, with base depressed beside humeral calli; striae weakly impressed; strial punctures dense and rather large, becoming finer and somewhat obsolete apically; intervals slightly to weakly convex, very densely and coarsely punctate, the punctures slightly smaller than on striae, becoming larger than on striae in apical portions of elytra; humeral calli short, distinctly humped; elytral epipleura depressed and coarsely microsculptured, with moderately dense piligerous punctures.

Prothoracic hypomera weakly depressed, cribrous by dense microsculpture and dense and coarse punctures. Prosternum densely microsculptured, very feebly beaded at apex in part, with coarse, large and piligerous punctures; prosternal process broad linguiform ( Fig. 12 ), almost horizontal, rounded at apex, coarsely and densely punctate. Mesoventral ridge short, U-shaped, with anterior angles obtusely rounded and not produced in lateral view. Metaventrite strongly convex in middle, with punctures piligerous and dense, larger on antero-median portion, and becoming smaller posteriad, smaller and sparser laterad. Abdomen weakly convex, with an oval depression at middle of 1st ventrite; punctures very dense, piligerous, coarse on basal three ventrites and fine on apical two.

Aedeagus short ( Fig. 13 ); basale distinctly curved ventrad, 1.84 times as long as apicale, widest at basal third; apicale depressed dorsally, slightly curved ventrad, weakly convergent in middle and subtruncate at apex.

Legs short. Femora pubescent, moderately dilated towards apical third. Tibiae short and slender, scarcely incurved and unarmed. Tarsi slender, and rather long.

Female. Unknown.

Distribution. China (Hainan Is.).

Etymology. The specific epithet is named after the blackish dorsal colour of the new species.

Differential diagnosis. This new species is very similar to Androsus taiwanus Masumoto et al., 2012 from Taiwan, but is clearly separable from the latter in having the body subshiny, without metallic sheen; frontoclypeal suture not arcuate in middle; inner ocular sulci clearly engraved; pronotum wider, more coarsely and densely punctate, with anterior margin evenly and arcuately emarginate, not straight in middle; elytra with intervals more coarsely and densely punctate; and mesoventral ridge broadened U-shaped.

Figures

FIGURES 8–13. Tenebrionidae spp. 8–10. Tetraphyllus hlaicolus sp. n.; 11–13. Androsus pullus sp. n.—8 & 11. mentum (with submentum in fig. 11); 9 & 12. prosternal process; 10 & 13, aedeagi (right: in lateral view; left: in dorsal view). Scale bars. 0.2 mm for fig. 8, 11–13, 0.5 mm for figs. 9–10.

FIGURES 14–21. Tenebrionidae spp. 14. Tetraphyllus hlaicolus sp. n., holotype; 15. Androsus pullus sp. n., holotype; 16. Tetragonomenes sylvestris sp. n., holotype; 17. Taichius caeruleopunctatus sp. n., holotype; 18. Hemicera (Hemicera) viridula sp. n., paratype; 19. Euhemicera hirtipes sp. n., holotype; 20. ditto, venter, showing femoral pubescence and tibial emargination; 21. venter of Euhemicera gebieni (Kaszab, 1941) from Taiwan.