Carpelimus (Bucephalinus) koreanus Lee and Ahn

Lee, Jae-Seok & Ahn, Kee-Jeong, 2019, Description of a New Species of Carpelimus Leach (Coleoptera: Staphylinidae: Oxytelinae) in Korea, The Coleopterists Bulletin 73 (4), pp. 1093-1097 : 1093-1095

Carpelimus (Bucephalinus) koreanus Lee and Ahn , new species

Zoobank.org/ urn:lsid:zoobank.org:act:B868AF7D-B0FC-4CA9-8057-11C1559BA64F ( Figs. 1–4 )

Type Material. Holotype. ♂, labeled as follows: “ KOREA: Daejeon-si , Dong-gu , Secheon-dong, Mt. Sikjangsan, N36°19’18.48” E127°29’00.73”, 168 m, 19 VII 2018, IS Yoo, JS Lee, near stream, floatation; HOLOTYPE Carpelimus (Bucephalinus) koreanus Lee and Ahn 2019 ”. Desig. J.-S. Lee and K.-J. Ahn 2019. ( CNUIC) . Paratypes: 23 exx. ( CNUIC): 5♂ 6♀, same data as holotype; 5♂ 5♀, same data as holotype except “ 24 VI 2019, JS Lee, near stream, floatation”; 2 exx., “ KOREA: Chungnam Prov., Daejon [Daejeon]-City, Sechon[Secheon]- dong, Sechon[Secheon]-Park, 17 VIII 1999, H.-J. Kim ,

1.28 mm.

ex near stream”. 1 ex. ( HNHM): 1♂, “ KOREA: Chungnam Prov., Daejon [Daejeon]- City, Sechon [ Secheon ]-dong, Sechon [ Secheon ]- Park , 17 VIII 1999, H.-J. Kim, ex near stream” .

Other Material Examined. 19 exx. ( CNUIC): 1 ex., “ KOREA: Chungnam Prov., Daejeon-city, Sutonggol , 26 VI 1999, H-J Kim, ex near stream”; 2 exx., same data as former except “ Daejon [Daejeon]- City, Sechon[Secheon]-dong, Sechon[Secheon]-Park, 17 VIII 1999, H.-J. Kim, ex near stream” ; 3♀, “ KOREA: Gangwon Prov., Wonju-si, Socho-myeon, Hakgok-ri , Mt. Chiaksan , Guryong-valley , N37°23’48” E128°03’05”, 10 VIII 2015, IS Yoo, near mountain stream” ; 1♂ 4♀, “ KOREA: Gyeongbuk Prov., Ulreung-gun, Seo-myeon, Namseo-ri , Namseo-stream , N37°28’40.98” E130°50’07.29” 38 m, 17 X 2014, IS Yoo, JS Lee, ex near stream” ; 1♂ 3♀, same data as former except “ N37°29’16.11” E130°50’02.67” 176 m, 17 X 2014, IS Yoo, JS Lee, ex near stream” ; 1♀, same data as former except “ Namyang-ri, Namyangstream , N37°27’58.04” E130°50’17.45” 0 m, 18 X 2014, IS Yoo, JS Lee, ex near stream” ; 1♀, same data as former except “ N37°28’33.36” E130°51’03.21” 101 m, 18 X 2014, IS Yoo, JS Lee , ex near stream”; 2 exx, same data as former except “ N37°28’49.08” E130°51’11.56” 137 m, 18 X 2014, IS Yoo, JS Lee, ex near stream” .

Description. Length = 1.20–1.30 mm, width = 0.60–0.72 mm. Body ( Fig. 1 ) flattened, widest at posterior fifth of elytra, surface glossy and pubescent. Body brown to black; head black; pronotum, elytra, and abdomen dark brown to black; mouthparts, antennae, and legs brown. Head: Transverse and narrower than pronotum; widest across eye, arrow-shaped ( Fig. 2A ); clypeus transverse, antero-lateral margin rounded; eye moderately large and rounded in lateral aspect, with interfacetal setae; temple well-developed, diameter of eye in dorsal view about 2.0 times as long as temple; gular suture entire and broadly divergent posteriorly; neck constriction well-developed, setae present; intervals between punctures usually narrower than their diameter; antenna slender, moderately elongate and pubescent, antennomere 1 longest, 4 shortest, 1–11 elongate ( Fig. 2B ); anterior margin of antennomeres 9–10 with dense, short, and thick setae. Mouthparts: Labrum transverse, divided in middle, lateral margin rounded, anterior margin broadly emarginate; mandible triangle, apex bifid, with 2 subapical tooth, prostheca well-developed; maxillary palpus with 4 palpomeres, palpomere 1 small, 2 and 3 slightly dilated to apex, with dense setae, 4 short and slender; ligula not divided; mentum subquadrate, anterior margin emarginate. Thorax: Pronotum transverse, width = 0.45–0.50 mm, about 1.3 times as wide as long, widest at anterior third and with 5 grooves ( Fig. 2C ), surface pubescent; hypomera well-developed; scutellum an inverted triangle, posterior half with ovally impressed, impression about 1.38 times as wide as long ( Fig. 2E ); elytron elongate, pubescent, punctures distinctly smaller than those on pronotum, postero-outer margin rounded, posterior margin emarginate; posterior margin with membranous lobe ( Fig. 2G ); epipleural suture complete; procoxal rest W-shaped; mesoventral process extended to slightly less than half of mesocoxal cavity and pointed at apex; metaventral process short and broadly rounded ( Fig. 2D ); femur and tibia with long, slender pubescence, tibia with spines at apex; tarsal formula 4-4-4 ( Fig. 2F ). Abdomen: Slightly dilated to posterior margin of tergite V; tergites II–VII with 2 pairs of paratergites; posterior margin of tergite VII with fringe of short setae. Secondary sexual characteristics: Posterior-middle margin of male sternite VII emarginate and with many setae ( Fig. 3A ), posteriormiddle margin of male sternite VIII convex ( Fig. 3B ), posterior margin of female sternite VIII convex ( Fig. 3D ), male tergite IX with ventral struts, struts longer than other part, female tergite IX without ventral struts. Male sternite IX present. Genitalia: Aedeagus with 2 teeth ( Fig. 4A ); parameres long, slender and apex expanded ( Fig. 4C ); spermatheca as in Fig. 4D .

Distribution. Korea (South).

Remarks. This species is closely related to Carpelimus curvus Gildenkov from Taiwan but can be distinguished by the shape of parameres. Carpelimus curvus has an elongate, curved apex of the paramere, but C. koreanus has apically expanded parameres ( Fig. 4C ). Carpelimus koreanus is also similar to Carpelimus terribilus Gildenkov from the Philippines but can be distinguished by the shape of the parameres, the structure of the internal sac of the aedeagus, and the lateral margin of the pronotum. Carpelimus terribilus has a more elongate apex of the parameres and an angled lateral margin of the pronotum, but C. koreanus has a rounded apex of the parameres ( Fig. 4C ) and rounded lateral margin of the pronotum. In addition, the punctation on the lateral parts of the pronotum and elytra is about 1.3 and 1.0 times larger than the diameter of the eye facet in C. koreanus ( Fig. 1 ) but about 1.5 times larger in C. terribilus .

Figures

Fig. 1. Habitus of Carpelimus koreanus, male,

Fig. 2. Carpelimus koreanus. A) Head, dorsal aspect, B) Antenna, C) Pronotum, dorsal aspect, D) Meso- and metaventrites, ventral aspect, E) Scutellum, dorsal aspect, F) Mesotarsus, lateral aspect, G) Elytron, dorsal aspect. Scale bars = 0.1 mm.

Fig. 3. Carpelimus koreanus. A) Male abdominal sternite VII, ventral aspect, B) Male abdominal tergite VIII, dorsal aspect, C) Male abdominal sternite VIII, ventral aspect, D) Female abdominal tergite VIII, dorsal aspect. Scale bars = 0.1 mm.

Fig. 4. Carpelimus koreanus. A–B) Aedeagus, ventral and lateral aspects, respectively, C) Paramere, lateral aspect, D) Spermatheca, lateral aspect. Scale bars = 0.1 mm.