Stenothemus davidi ( Pic, 1926 ) Yang & Yang & Liu, 2021

Yang, Yuxia, Ge, Shujuan, Yang, Xingke & Liu, Haoyu, 2021, Taxonomic revision of the species of Stenothemus from Southwest China (Coleoptera, Cantharidae), with the descriptions of five new species, European Journal of Taxonomy 757 (1), pp. 1-36 : 6-8

Stenothemus davidi ( Pic, 1926) comb. nov.

Figs 1C , 2D‒F , 3B , 4B

Anolisus davidi Pic, 1926: 357 .

Stenothemus dinshuiensis Švihla, 2011: 18 , fig. 20. syn. nov.

Podabrus (Dichelotarsus) davidi – Delkeskamp 1977: 32.

Dichelotarsus davidi – Kazantsev & Brancucci 2007: 236.

Malthacus davidi – Takahashi 2007: 249.

Material examined

Holotype

CHINA • ♀; [p] “MUSEUM PARIS // MOU. PIN / A. DAVID 1870”, [h] “1233”, “818”, “Alle Klauen // einfach”, [h-p] “ Det. M. Pic (Digoin) // Anolisus / Davidi Pic // n. sp.”, [p] “HOLOTYPE”, [h-p] “ Stenothemus // davidi (Pic) // det. Y.X.Yang, 2009”; MNHN.

Additional material

CHINA – Shaanxi • 1 ♂; Daguping Protection Station ‒ Yueba Protection Station ; 30 Jun. 2012; W.G. Liu leg.; IZAS • 1 ♀; Qinling, Zhouzhi, Houzhenzi ; 1276 m a.s.l.; 2 Jul. 2008; W.G. Liu leg.; IZAS . – Sichuan • 1 ♂; Emei Shan, Baoguosi ; 550‒750 m a.s.l.; 10 May 1957; K.R. Huang leg.; IZAS • 1 ♂; same collection data as for preceding; 5 Jun. 1957; F.X. Zhu leg.; IZAS • 1 ♂; Emei Shan, Qingyin’ge ; 800‒1000 m a.s.l.; 7 May 1957; Z.Y. Wang leg.; IZAS • 1 ♂; same collection data as for preceding; 9 May 1957; Y.C. Lu leg.; IZAS • 1 ♂; Emei Shan ; 1100‒1800 m a.s.l.; 23 Jun. 1955; Z.L. Ge leg.; IZAS • 1 ♂; Qingcheng Shan, Shangqinggong ; 6600 m a.s.l.; 27 May 1979; P. Gao leg.; IZAS .

Descriptive notes

Body length (both sexes): 5.5‒8.3 mm; width: 0.9‒1.5 mm.

Male

AEDEAGUS ( Fig. 2D‒F ). Moderately swollen laterally at basal part, moderately reduced apically in diameter; basal piece nearly as long as dorsal plate of each paramere, with a small, bifurcate conjoined middle nodule at base of ventral side; ventral processes of parameres nearly parallel to each other, moderately long and slightly thickened apically, bent ventrally in lateral view; dorsal plates slightly longer than ventral processes, strongly narrowed near base and approaching each other, apex acute and directed ventrally; apical parts of laterophyses depressed and separated from each other, apex acute and bent dorsally, roughly reaching middle emargination between dorsal plates.

Female ( Fig. 1C ) ABDOMINAL STERNITE VIII ( Fig. 3B ). Moderately narrowed posteriorly, lateroapical angles widely rounded, posterior margin widely and roundly emarginate in middle and feebly sinuate on both sides,

behind the notch with a membrane which is sclerotized and triangularly bilobed at apex.

INTERNAL ORGAN OF REPRODUCTIVE SYSTEM ( Fig. 4B ). Vagina stout, with median oviduct situated at ventroapical part, vagina abruptly narrowed in apical part and extended into a short duct which diverticulum and spermathecal duct are arising from; diverticulum moderately long, about 0.85 times adult body length, evenly thinned apically, slender tube-shaped and spiral; spermathecal duct slightly long but much shorter than diverticulum; spermatheca slender tube-shaped and spiral, obviously thinner than spermathecal duct and slightly shorter than diverticulum, with basal part extended into a short tube, at opening of accessory gland. Accessory gland thin in basal part and the remaining parts thick, much shorter than spermatheca.

Distribution

China (Sichuan, Shaanxi). New record for Shaanxi Province.

Remarks

The type ( Fig. 1C ) is seriously damaged, with right antenna, all legs except the left proleg one and abdomen missing, and with “alle Klauen einfach” [‘all claws simple’] label attached, written by Dr W.Wittmer. Fortunately, some additional material including males and females was available, enabling us to recognize it. The genitalia of both sexes are illustrated and described for the first time. Based on the structure of the aedeagus ( Fig. 2D‒F ) and all simple claws, it definitely belongs to Stenothemus .

Furthermore, no difference is found from S. dinshuiensis , including overall appearance and structure of aedeagus, so it is considered to be a junior synonym of S. davidi .

Figures

Fig. 1. Habitus, dorsal view.A. Stenothemus benesiŠvihla, 2004, holotype, ♂ (NMPC). B. S. shaanxiensis Švihla, 2004 stat. nov., holotype, ♂ (NMPC). C. S. davidi (Pic, 1926) comb. nov., holotype, ♀ (MNHN). D. S. diffusus Wittmer, 1974, paratype, ♂ (NHMB CANTH00003518). E. S. dundai Švihla, 2004. holotype, ♂ (NMPC). F. S. grahami Wittmer, 1974, paratype, ♂ (NHMB CANTH00003898). Scale bars = 1.0 mm.

Fig. 2. Aedeagus(A, D, G = ventral view; B, E, H = dorsal view; C, F, I = lateral view). A‒C. Stenothemus shaanxiensis Švihla, 2004 stat. nov. (CQNU, Chongqing). D‒F. S. davidi (Pic, 1926) comb. nov. (IZAS, Sichuan). G‒I. S. diffusus Wittmer, 1974 (MHBU, Sichuan). Scale bars = 0.5 mm.

Fig. 3. Abdominal sternite VIII of female, ventral view. A. Stenothemus shaanxiensis Švihla, 2004 stat. nov. (IZAS, Shaanxi). B. S. davidi (Pic, 1926) comb. nov. (IZAS, Shaanxi). C. S. diffusus Wittmer, 1974 (MHBU, Sichuan). D. S. dundai Švihla, 2004 (MHBU, Sichuan). E. S. grahami Wittmer, 1974 (IZAS, Gansu). F. S. jindrai Švihla, 2004 (IZAS, Sichuan). Scale bars = 1.0 mm.

Fig. 4. Female reproductive system, ventral view. A. Stenothemus shaanxiensis Švihla, 2004 stat. nov. (IZAS, Shaanxi). B. S. davidi (Pic, 1926) comb. nov. (IZAS, Shaanxi). C. S. diffusus Wittmer, 1974 (MHBU, Sichuan). D. S. dundai Švihla, 2004 (MHBU, Sichuan). Abbreviations: see Material and methods. Scale bars = 0.5 mm.