Rhomphocallus coreanus, Assing, 2011

Assing, V., 2011, The fourth species of Rhomphocallus ASSING (Coleoptera: Staphylinidae: Aleocharinae: Oxypodini), Linzer biologische Beiträge 43 (1), pp. 279-282 : 280-282

Rhomphocallus coreanus nov.sp. ( Figs 1-10 )

T y p e m a t e r i a l: Holotype [apparently slightly teneral]: " 14.07.2010, Ulleongdo , Gyeongsangbukdo ( Südkorea), leg. T. Kölkebeck / 607 / Holotypus Rhomphocallus coreanus sp. n. det. V. Assing 2010".

D e s c r i p t i o n: Body length 5.7 mm. Habitus as in Fig. 1 . Coloration: head and pronotum blackish-brown; elytra bicoloured, dark-brown, with the humeral portion, the posterior 4/5 of the sutural portion, and the posterior margin broadly yellowish; abdomen blackish-brown, with the apex (posterior 1/3 of segment VII; segments VIII-X) reddishyellow; legs dark-reddish; antennae dark-brown, with the basal three antennomeres reddish.

Head ( Fig. 2 ) weakly transverse; punctation dense and coarse, but not areolate; interstices much narrower than diameter of punctures and with very shallow microsculpture visible only at high magnification ( Fig. 5 ). Eyes bulging, projecting from lateral contours of head, and slightly longer than postocular portion in dorsal view. Antenna ( Fig. 3 ) approximately 1.5 mm long and relatively slender; preapical antennomeres weakly transverse; antennomere XI constricted in the middle and strongly elongated, longer than the combined length of VIII-X, but shorter than the combined length of VII-X ( Fig. 4 ).

Pronotum ( Fig. 2 ) approximately 1.3 times as broad as long and 1.35 times as wide as head, widest approximately in the middle; posterior angles weakly marked; punctation and microsculpture similar to those of head ( Fig. 5 ).

Elytra 1.08 times as long and about 1.3 times as wide as pronotum ( Fig. 2 ); humeral angles marked; punctation and microsculpture similar to those of head and pronotum ( Fig. 6 ). Hind wings fully developed. Legs slender; metatarsomere I extremely elongated, much longer than the combined length of II-IV, almost as long as the combined length of II-V.

Abdomen with segments III-VI of subequal width ( Fig. 7 ); tergites III-V with moderately deep, tergite VI with very shallow anterior impression; punctation dense and distinct; interstices glossy, but with shallow microsculpture visible only at high magnification; posterior margin of tergite VII with palisade fringe.

: tergite VIII with very weakly and broadly concave posterior margin ( Fig. 7 ); sternite VIII posteriorly with fringe of dense, long, thin marginal setae, posterior margin produced in the middle ( Fig. 8 ); median lobe of aedeagus approximately 1 mm long; ventral process long and sickle-shaped ( Fig. 9 ); apical lobe of paramere as in Fig. 10 .

: unknown.

E t y m o l o g y: The specific epithet is an adjective derived from South Korea, where this species is currently the only known representative of the genus.

C o m p a r a t i v e n o t e s: In order to account for the new species, the key in

ASSING (2003) is modified as follows:

2 Apical antennomere shorter, shorter than the combined length of antennomeres VIII-X (ASSING 2003: Fig. 2 ). Aedeagus and spermatheca as in ASSING (2003: Figs 3-4, 6 ). Japan..................................................................................................... R. princeps (SHARP)

- Apical antennomere conspicuously long, longer than the combined length of antennomeres VIII-X ( Fig. 4 )..............................................................................................3

3 Antennomere XI as long as the combined length of antennomeres VII-X; preapical antennomeres more transverse (ASSING 2003: Fig. 11). Punctation of head and pronotum extremely dense and – at least partly – areolate, interstices reduced to very narrow ridges. Male tergite VIII weakly convex posteriorly (ASSING 2003: Fig. 16). Posterior margin of male sternite VIII as in ASSING (2003: Fig. 17). Aedeagus and spermatheca as in ASSING (2003: Figs 12, 14-15). Japan.................. R. maruyamai ASSING

- Antennomere XI shorter than the combined length of antennomeres VII-X; preapical antennomeres less transverse ( Fig. 4 ). Punctation of head and pronotum less dense and not areolate, interstices somewhat shiny ( Fig. 5 ). Male tergite VIII weakly concave posteriorly ( Fig. 7 ). Male sternite VIII as in Fig. 8 . Aedeagus as in Fig. 9 . South Korea..... .............................................................................................................. R. coreanus nov.sp.

D i s t r i b u t i o n: The type locality is situated in Ulleongdo [= Ulleungdo, = Ullung] island, some 130 km off the east coast of mainland South Korea. Bionomic data are not available.

Figures

Figs 1-10: Rhomphocallus coreanus nov.sp. (holotype): (1) habitus; (2) forebody; (3) antenna; (4) apical portion of antenna; (5) posterior median portion of head and anterior portion of pronotum; (6) sutural portion of elytra; (7) abdomen; (8) male sternite VIII; (9) median lobe of aedeagus in lateral view; (10) apical lobe of paramere. Scale bars: 1-2, 7: 1.0 mm; 3: 0.5 mm; 4-6, 8-9: 0.2 mm; 10: 0.1 mm.