Diochus caudapiscis Shuai, Nozaki & Tang, 2021

Shuai, Qi, Nozaki, Tsubasa & Tang, Liang, 2021, Notes on the genus Diochus Erichson, with descriptions of two new species from China (Coleoptera, Staphylinidae), Zootaxa 4908 (2), pp. 276-282 : 280-282

3. Diochus caudapiscis Shuai, Nozaki & Tang , new species

( Figs 3 , 23–29 )

Type material. Holotype. China: Yunnan: ♁, glued on a card with labels as follows: “ China: Yunnan Province, Dehongmang , Yingjiang County, Nabang Town , 24°42’59.10’’N, 97°35’04.54’’E, 356m, mixed leaf litter, sifted, 23.VII.2019, Cheng & Shen leg.” “ Holotype / Diochus caudapiscis / Shuai, Nozaki & Tang” [red handwritten label] ( SHNU) . Paratypes. 1♁ 2♀♀, same data as for the holotype ( SHNU) ; 1♁ 2♀♀, Dehongmang, Yingjiang County, Tongbiguan Town , 24°36’13.78’’N, 97°39’50.41’’E, 1407m, mixed leaf litter, sifted, 20.VII.2019, Cheng & Shen leg. ( SHNU) ; 1♁, Dehongmang, Yingjiang County, Nabang Town , 24°42’05.46’’N, 97°34’25.18’’E, 369m, mixed leaf litter, sifted, 24.VII.2019, Cheng & Shen leg. ( SHNU) ; 1♀, Dehongmang, Yingjiang County, Taiping Town , Near Mangna Road , 24°37’42.99’’N, 97°45’34’’E, 1471m, mixed leaf litter, sifted, 28.VII.2019, Cheng & Shen leg. ( SHNU) ; 4♀♀, Dehongmang, Yingjiang County, Tongbiguan Town , near Mangna Road , 24°36’59.75’’N, 97°44’30.89’’E, 1550m, mixed leaf litter, sifted, 29.VII.2019, Cheng & Shen leg. ( SHNU) ; 1♁, Lushui County, Liuku, Qingshan Park , 7.VII.2010, Liang Tang leg. ( SHNU) .

Description. Body dark brown with pronotum and portions along posterior margins of abdominal segments lighter, appendages reddish yellow with antennal segments 4–11 slightly darker.

Similar to Diochus guizhouensis sp. nov. except for the measurements and sexual characters. BL: 4.8–5.8 mm, FL: 2.7–2.9 mm. HL: 0.68–0.80 mm, HW: 0.57–0.62 mm, EyL: 0.17–0.21 mm, TL: 0.43–0.47 mm, PL: 1.01–1.07 mm, PW: 0.72–0.89 mm, EL: 0.98–1.09 mm, EW: 1.05–1.12 mm, SL: 0.68–0.76 mm. Head 1.28–1.36 times as long as wide; pronotum 1.17–1.23 times as long as wide; elytra 0.88–0.99 times as long as wide.

Male. Head with a small round elevation between eyes; sternite VIII ( Fig. 28 ) with posterior margin emarginate at middle, lateral corner produced apicolaterad; sternite IX ( Fig. 27 ) symmetrical, widest near the middle; aedeagus ( Figs 23–25 ) with parameres as long as 1/3 length of the median lobe, internal structures sclerotized, consisting of paired apical sclerites and a long basal plate.

Female. Head without a small round elevation between eyes; sternite VIII with posterior margin rounded; spermatheca ( Fig. 29 ) sclerotized, very long, with three bends.

Distribution. China (Yunnan).

Remarks. The new species is similar to D. guizhouensis sp. nov. in appearance, but can be distinguished from the latter by produced apical angles of male sternite VIII and different morphology of aedeagus and spermatheca.

Etymology. The specific name caudapiscis means fish tail, which is derived from the shape of male sternite VIII.

Figures

FIGURES 1–3. Habitus. 1—Diochus japonicus; 2—D. guizhouensis; 3—D. caudapiscis. Scale bars: 1 mm.

FIGURES 16–29. Sexual characters. 16–22—Diochus guizhouensis; 23–29—D. caudapiscis; 16, 18, 23—aedeagus in dorsal view; 17, 24, 25—aedeagus in ventral view; 19, 26—mandibles; 20, 27—male sternite IX; 21, 28—male sternite VIII; 22, 29—spermatheca. Scale bars: 0.25 mm.