Thinodromus (Thinodromus) sericatus ( Sharp, 1889 )

Lee, Seung-Il & Ahn, Kee-Jeong, 2007, The Korean species of the genus Thinodromus Kraatz (Coleoptera: Staphylinidae: Oxytelinae), Zootaxa 1573 (1), pp. 39-50 : 47-48

Thinodromus (Thinodromus) sericatus ( Sharp, 1889)

( Figs. 3 , 7 , 13, 14, 19, 23, 27, 31, 35, 39, 43)

Trogophloeus sericatus Sharp, 1889: 415 .

Trogophloeus eminens Sharp, 1889: 416 (synonymized by Gildenkov, 2001).

Trogophloeus (Thinodromus) eminens: Bernhauer & Schubert, 1911: 94 .

Trogophloeus (Thinodromus) sericatus: Bernhauer & Schubert, 1911: 95 .

Carpelimus (Thinodromus) sericatus: Adachi, 1957: 6 .

Carpelimus sericatus: Nakane, 1963: 83 .

Thinodromus eminens: Herman, 1970: 387 .

Thinodromus sericatus: Herman, 1970: 387 ; Shibata, 1976: 145; Frank, 1982: 16; Watanabe, 1985: 273; Yuh et al., 1985: 227; Kim et al., 1994: 140; Cho & Ahn, 2001:43.

Thinodromus (Thinodromus) eminens: Gildenkov, 2000: 693 .

Thinodromus (Thinodromus) sericatus: Gildenkov, 2000: 693 ; 2001: 70; Smetana, 2004: 535.

Description. Body length 2.7–3.6 mm. Body weakly glossy. Color usually black, tip of tibia and tarsus brown ( Fig. 3 ).

Head: Slightly wider than long. Eyes large, convex, occupying almost entire lateral side of head. Median sclerotized plate of hologlossa ( Fig. 7 ) circular, about 1.1 times longer than wide. In male antenna slightly longer than female. Male antenna (Fig. 13): scape robust, about 2.7 times longer than wide; pedicel about 2.1 times longer than wide, shorter and narrower than scape; antennomere 3 slender, slightly dilated apically, 2.3 times longer than wide, slightly longer and narrower than pedicel; 4–7 about 2.2 times longer than wide; 8 about 2.0 times longer than wide; 9–10 about 1.7 times longer than wide. Female antenna (Fig. 14): antennomeres 4–7 about 1.8 times longer than wide; 8 about 1.5 times longer than wide; 9 about 1.3 times longer than wide; 10 about 1.1 times longer than wide.

Thorax: Pronotum ( Fig. 19 ) wider than long, widest at middle, narrowest at base. Intervals between punctures wider than puncture diameter, punctures very small. Scutellar impression ( Fig. 23 ) 1.4 times wider than long, shaped as broadly emarginated inverted triangle, with many short pubescence. Elytra wider than pronotum, each elytron with shallow diagonal groove in apical third.

Abdomen: Male sternite VIII ( Fig. 27 ) wider than long and more or less prolonged apically. Posterior margin of female sternite VIII ( Fig. 31 ) broadly round.

Aedeagus ( Figs. 35, 39 ) oval and more or less flattened, median lobe long, parameres slightly broad, wrapping around two-thirds of median lobe.

Spermatheca ( Fig. 43 ) in the middle very slightly curved.

Type material. Lectotype (designated by Gildenkov 2001), male, labeled as follows: ‘ Trogophloeus sericatus . Type D. S. Konose. Japan. 29.4.1881. Lewis, Type, Lectotypus Trogophloeus sericatus Sharp, Sharp Coll 1905 –313, Japan. G. Lewis., Thinodromus sericatus 2000 det. M. Gildenkov’ (Deposited in The Natural History Museum, London).

Additional materials (total 30 specimens). KOREA: Gangwon Prov. : 2 ex., Chugokcheon, Balsan-ri, Nam-myeon , Chuncheon City , 80 m, 24 VIII 2005, S.-I. Lee, S.-M. Choi and J.-S. Park, ex under stones near stream ; 9 ex., Mt. Chiaksan, Wonju City , 231 m, 8 VII 2005, K.-J. Ahn, S.-J. Park and S.-I. Lee, ex under stones near stream ; 5 ex., Yonsei University, Heungeop-myeon, Wonju City , 7 VII 2005, S.-J. Park & S.-I. Lee, ex under stones near stream (3 males and 2 females, on slide) ; Jeonnam Prov.: 6 ex. , Wolpyeong-ri, Jinan-gun , 24 IX 2005, S.-J. Park & D.-H. Lee, ex under stones near stream ; 4 ex., Mt. Duryunsan, Gurim-ri, Samsan-myeon , Haenam-gun , 46 m, 20 V 2005, S.-I. Lee & J.-S. Park ; Gyeongbuk Prov.: 1 ex. , Dongmyeong reservoir, Chilgok-gun , 23 VII 1986, Y.B. Cho ; Gyeongnam Prov.: 3 ex. , Jeongdong-myeon, Sacheon City , 10 VI 1986, K.S. Lee, ex light near stream .

Distribution. Korea and Japan.

Remarks. The species is very similar in appearance to T. bernhaueri , but can be distinguished by the circular median sclerotized plate of hologlossa (trapezoidal in T. bernhaueri ), shorter pubescence on abdomen, and longer antennomeres as well as a distinct structure of the aedeagus and spermatheca. Thinodromus sericatus is also different from T. deceptor and T. japonicus by the all antennomeres longer than wide, black coloration, and very short pubescence along the entire body.

Figures

FIGURES 1–4. Habitus of Thinodromus. 1: T. deceptor, 3.2 mm; 2: T. bernhaueri, 3.3 mm; 3: T. sericatus, 3.5 mm; 4. T. japonicus, 3.8 mm.

FIGURES 5–8. Median sclerotized plate of hologlossa of Thinodromus, ventral aspect. 5: T. deceptor; 6: T. bernhaueri; 7: T. sericatus; 8: T. japonicus. Scale bars: 0.1 mm.

FIGURES 17–20. Pronotum of Thinodromus, dorsal aspect, circle indicates punctures. 17: T. deceptor; 18: T. bernhaueri; 19: T. sericatus; 20: T. japonicus. Scale bars: 0.1 mm.

FIGURES 21–24. Scutellum of Thinodromus, dorsal aspect. 21: T. deceptor; 22: T. bernhaueri; 23: T. sericatus; 24: T. japonicus. Scale bars: 0.1 mm.

FIGURES 25–32. Abdominal sternite VIII of Thinodromus, (25–28) and female (29–32), ventral aspect. 25, 29: T. deceptor; 26, 30: T. bernhaueri; 27, 31: T. sericatus; 28, 32: T. japonicus. Scale bars: 0.1 mm.

FIGURES 33–40. Aedeagus of Thinodromus, dorsal (33–36) and lateral (37–40) aspect. 33, 37: T. deceptor; 34, 38: T. bernhaueri; 35, 39: T. sericatus; 36, 40: T. japonicus. Scale bars: 0.1 mm.

FIGURES 41–44. Spermatheca of Thinodromus. 41: T. deceptor; 42: T. bernhaueri; 43: T. sericatus; 44: T. japonicus. Scale bars: 0.1 mm.