The genus CrepidophorusMulsant and Guillebeau, 1853 was established by type species Crepidophorus anthracinus Mulsant and Guillebeau. But the genus and species were synonymized to Athous mutilatusRosenhauer, 1847 by Candèze (1860). After then, the type species of Crepidophorus, A. mutilatus, was subsequently designated by Reitter (1905). The genus is separately characterized from related genera, Athous and Hemicrepidius, and Elathous by as follows: 1) well carinated front margin of head. 2) pronotum with ocellated punctures; hind angles short and wide at base, with unicarina. 3) 5th interval of elytron with a ridged carina at base. 4) pronotosternal sutures simple, not groove at anterior. Members of Crepidophorus consist of three palaearctic species (Cate, 2007). In this study, a new species, C. bangtaesanensis sp. nov., discovered from Korea is described and also its photos are provided.

Materials and Methods

One male specimen was collected at Mt. Bangtae-san, Inje-gun, Gwangwon-do, Korea (Fig. 1). For morphological study, the general structures of specimens were observed under a stereoscopic microscope (MZ16A and MZ6; Leica, Solms, Germany). The holotype specimen was preserved at the insect collection of Applied Entomology Division, Department of Agricultural Biology, National Institute of Agricultural Science, Jeonju, Korea.

Result

Systematics

Family Elateridae Leach, 1815 방아벌레과

Subfamily Denticollinae Stein and Weise, 1877 주홍방아벌레과

Tribe Hemicrepidiini Champion 1894 다색방아벌레족

Genus CrepidophorusMulsant and Guillebeau, 1853 톱더듬이방아벌레속(신칭)

CrepidophorusMulsant and Cuillebeau, 1853: 189. Type species: Athous mutilatus Rosentauer, 1847: 16 (Europe), subsequently designation by Reitter, 1905: 32.

Diagnosis. Body medium; frontal margin of head distinctly, straightly expanded anteriorly, not obsolete in median; antennae strongly serrated from 3rd antennomere, with 3rd to 10th subtriangular; frontal groove broadly excaved at median; pronotal hind angle with a distinct carina; posterior margin of pronotum without basal incisures near hind angles; pronotosternal sutures simple; posterior margin of hypomeron nearly straight, not emarginated, or slightly convex at posterior angle; 7th strial interval of elytron clearly elevated, forming humeral carina form base to one fifth (Leseigneur, 1972).

Distribution. Three species in Palaearctic regions (Cate, 2007).

Remarks. This genus is new to fauna in Korea.

Crepidophorus bangtaesanensis sp. nov. 톱더듬이방아벌레 (신칭) (Fig. 2A~L)

Description. Body (Fig. 2A) length 12.8 mm, width 3.4 mm, rather stout, elongate; color black except for blackish brown femora and anterior part of each antennomere, dusky reddish brown base of each antennomere, tibia, hind angles of pronotum; pubescence pale reddish brown, short; punctures ocellate, large, distinct in head, pronotum, scutellum, and ventral surface. Head 1.44 times as wide as long, with subquadrate impression; frontal margin round, well developed ahead (Fig. 2C); puncture ocellate, large, dense, interval surface between punctures narrower than diameter of puncture. Antennae (Fig. 2B) sublamellate shaped from 3rd to 10th; length/width (mm) of all antennomeres as follows: 0.500/0.250, 0.163/ 0.195, 0.375/0.400, 0.425/0.450, 0.425/0.450, 0.475/0.450, 0.475/0.475, 0.475/0.450, 0.500/0.400, 0.500/0.350, 0.575/0.238; 11th longest. Pronotum convex, with a shallow median longitudinal furrows from posterior base to middle, with two small circular impressions at posterior 1/3; lateral margin slightly arched to anterior and then, distinctly convergent inwardly at anterior part, widest at base of hind angle; punctures large, dense; hind angle (Fig. 2D) short, stout, not divergent laterally, having short, distinctly ridged carina which not reaching to apex. Prosternum weakly convex ventrally; anterior rim expanded, round, well carinate; prosternal process slightly bent beyond procoxae, elongated (Fig. 2F); pronotosternal suture simple, weakly carinate anteriorly; posterior border of hypomeron almost straight; posterior margin of procoxa narrowly opened (Fig. 2E). Metasternum with simple, small punctures. Scutellum tongue shaped, 1.23 times as long as wide, feebly depressed at posterior part; anterior margin indistinct; punctures large, dense (Fig. 2G). Elytra 2.47 times as long as wide, anterior base well depressed; striae distinct, with large punctures; intervals well convex above, coarsely punctured; 5th interval with well ridged carina at anterior base. Legs moderate; tarsus with distinct lobes from 1st to 3rd beneath, 4th tarsomere smallest, simple; claws simple. Abdominal tergites 8 and 9 to 10 as figured (Fig. 2H and I); abdominal sternites 9 to 10 as figured (Fig. 2J). Aedeagus (Fig. 2K and L), clearly elongate; basimere longer than parameres, slightly sinuate; paramere parallel sided, with elongate triangular expansion bearing 8 to 11 long setae in dorsal surface as figured (Fig. 2L); median lobe a little longer than apex of paramere.

Female. unknown.

Specimen examined. Holotype. 1 male, Mt. Bangtae, Girin-myeon, Inje-gun, Gangwon-do, Korea. 5. VI. 2000. B. K. Byun.

Distribution. Korea.

Etymology. This new species is named from the collecting site, Mt. Bangtae, GW, Korea.

Remarks. This new species, Crepidophorus bangtaesanensis sp. nov., is extremely resemble C. rufiventrisGebler, 1833 known from Russia (Don’t confuse with a Nearctic species, Athous rufiventrisEschshcoltz, 1829, see Becker, 1979: 601), but can be easily distinguished by the subquadrate impression on the head, the semi-equal 3rd and 4th antennomeres in length, and the narrow triangular apico-lateral expansion of the paramere of the aedeagus. Whereas, C. rufiventris Gebler is characterized by the inverted triangular impression on the head, the distinctly longer 4th antennomere than 3rd one, and the broad triangular apico-lateral expansion of the paramere. The new species is also resemble C. expolitusGurjeva, 1987 known from the maritime province in Far East Russia by a homologous character, the subquadrate impression on the front of the head, which can be separated with other Palaearctic species, C. laetus (Candèze, 1879) known from Far East Russia (Gurjeva, 1989) and C. mutilates (Rosenhauer, 1847) known from Europe, having the inverted triangular impression on the head. However, this new species can be easily distinguished from them by more dark and blackish color of body, distinctly round frontal margin of the head, more sub-lamellate antennal segments, the longer basimere than the length of median lobe of male genitalia and differently expanded apico-lateral triangular lobes of the parameres.