Tetartopeus korgei, Assing, 2014

Assing, V., 2014, A revision of Tetartopeus IV. A new species from Turkey, new synonymies, and additional records (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 46 (2), pp. 1119-1131 : 1125-1127

Tetartopeus korgei nov.sp.

( Figs 11-16 , 18-19 )

Type material: Holotype: " Anatolia or., leg. H. Korge / Benliahmet sw. Kars, 31.VII.1967 / Lathrobium (Tetartopeus) nov.spec. / Holotypus Tetartopeus korgei sp.n., det. V. Assing 2014" ( MNHUB) . Paratypes: 1, 1 [both teneral]: same data as holotype .

Etymology: This species is dedicated to the late Horst Korge (Berlin), who collected the type material and who took a special interest in the Staphylinidae fauna of Turkey.

Description: Body length 6.2-6.8 mm; length of forebody 3.5-3.7 mm. Coloration: body (including apex of abdomen) black, except for the reddish posterior 3/5 of the elytra; legs yellowish; antennae dark-brown with antennomeres I-II dark-yellowish.

Head ( Fig. 11 ) approximately 1.1 times as long as broad; punctation rather sparse and relatively fine to moderately coarse; interstices on average distinctly broader than diameter of punctures, without microsculpture. Eyes moderately large and weakly convex, approximately half as long as distance from posterior margin of eye to posterior constriction in dorsal view. Antenna slender, approximately 2.2 mm long

Pronotum ( Fig. 11 ) approximately 1.2 times as long as broad and 1.15 times as broad as head; punctation moderately dense; interstices on average as broad as, or slightly narrower than, diameter of punctures, without microsculpture; impunctate midline moderately broad.

Elytra ( Fig. 11 ) short, 0.74-0.78 times as long as pronotum; punctation rather dense and coarse. Hind wings present, but possibly of reduced length. Metatarsomere I as long as II.

Abdomen approximately as broad as elytra; surface nearly completely matt due to extremely dense and fine punctation and distinct microsculpture; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII without appreciable sexual dimorphism, convex, indistinctly pointed in the middle ( Fig. 12 ).

: sternite VIII ( Fig. 13 ) approximately 1.2 times as broad as long, in postero-median portion with longer and denser dark pubescence, posterior margin slightly convexly projecting in the middle, this projection with minute median concavity; aedeagus ( Figs 14-16 ) 1.2 mm long; ventral process apically conspicuously bifurcate in lateral view; dorsal plate weakly sclerotized, apically convex in dorsal view.

: tergite VIII ( Fig. 18 ) weakly oblong, posterior margin nearly truncate in the middle; segments IX-X as in Fig. 19.

Comparative notes: Regarding the shape of the ventral process of the aedeagus, the new species is most similar to T. tezcani ANLAŞ, 2009 from central southern Anatolia, from which it differs by the dark apex of the abdomen ( T. tezcani : apex reddish), the anteriorly broadly blackish elytra ( T. tezcani : very narrowly infuscate at most), and by the straight ventral process of the aedeagus with two apical projections of similar length ( T. tezcani : ventral process of aedeagus distinctly curved in lateral view, dorso-apical projection much shorter than ventro-apical projection).

In order to account for T. korgei , the key to the Tetartopeus species recorded from Turkey in ASSING (2010) is modified as follows:

8. Elytra longer, more than 0.8 times as long as pronotum ( ASSING 2009: figure 25).: posterior margin of sternite VIII without median incision ( ASSING 2009: figure 26); ventral process of aedeagus basally stouter, straight and apically obliquely truncate ( ASSING 2009: figures 26-27). Turkey: Kastamonu ............................... T. inexcisus ASSING

- Elytra shorter, approximately 0.75 times as long as pronotum ( Fig. 11 ).: posterior margin of sternite VIII with small or minute median incision; ventral process of aedeagus of different shape.................................................................................................9

9. Head with slightly sparser punctation ( Fig. 11 ).: ventral process of aedeagus apically furcate (with a dorsal and a ventral projection of similar shapes) in lateral view ( Figs 14-16 ). Turkey: Kars ................................................................ T. korgei nov.sp.

- Head with denser punctation.: ventral process of aedeagus with a short tooth-shaped dorsal projection and with a hook-shaped ventral projection ( Assing 2010: figures 11- 12). Turkey: Kastamonu ............................................................................. T. vomer ASSING

Distribution and natural history: The type locality is situated to the southwest of Kars, Kars province, northeastern Anatolia. The paratypes are distinctly teneral.

Figures

Figs 11-17: Tetartopeus korgei nov.sp. (11-16) and paratype of Lathrobium maculatum LAST (17): (11) forebody; (12) female tergite VIII; (13) male sternite VIII; (14-15, 17) aedeagus in lateral and in ventral view; (16) apical portion of ventral process of aedeagus. Scale bars: 11: 1.0 mm; 12-15, 17: 0.5 mm; 16: 0.2 mm.

Figs 18-20: Tetartopeus korgei nov.sp. (18-19) and paratype of Lathrobium maculatum LAST (20): (18) female sternite VIII; (19) female tergites IX-X; (20) male sternite VIII. Scale bars: 0.5 mm.