Lathrobium (Lathrobium) corumense, Anlaş, 2024

Anlaş, Sinan, 2024, On the microphthalmous Lathrobium Gravenhorst species of Turkey V. A new species from Çorum province and an updated key for the microphthalmous Lathrobium species of Turkey (Coleoptera: Staphylinidae: Paederinae), Zootaxa 5447 (3), pp. 433-438 : 434-435

Lathrobium (Lathrobium) corumense sp. n.

( Figs. 1−10 )

Type material. Holotype: Turkey: ♁, “ Çorum, Çağşak 5 km SE,, 40°22’18’’N, 34°31’43’’E, 1416 m, 09.V.2022, leg. Kacar & Çelik. / Holotypus ♁, Lathrobium (Lathrobium) corumense sp. n. det. S. Anlaş 2024” <red printed label> ( AZMM) . Paratypes: 1♁, 2 ♀♀, same data as holotype ( AZMM) . 1 ♀, Çorum, Çağşak , 40°21’22’’N, 34°33’47’’E, 1100 m, 03.IV.2022, leg. Örgel, Kacar & Çelik. <all paratypes with red printed label> ( AZMM) .

Description. Habitus as in Figure 1 . Body 5.8−6.2 mm long. Colouration: forebody uniformly reddish brown, abdominal segments III–VI more or less blackish, abdominal segments VII–X reddish brown; antennae reddish brown, and legs light rufous.

Head oblong, 1.15−1.18 times as long as wide and widened posteriad ( Figs. 1−2 ); integument with shallow fine microreticulation; punctation coarse and sparse, interstices on average slightly wider than diameter of punctures in lateral areas and wider in median dorsal area; pubescence brownish and very rare; eyes partially reduced but clearly visible in dorsal view and slightly protruding from lateral contours of head. Antennae long and slender ( Fig. 1 ), approximately 2 mm long, all antennomeres distinctly oblong.

Pronotum distinctly oblong, 1.35 times as long as wide and approximately 0.95 times as wide as head ( Figs. 1−2 ); punctation similar to that of head, but slightly denser; pubescence reddish brown and very sparse; microsculpture absent.

Elytra at suture distinctly shorter than pronotum, at suture 0.70−0.75 times as long as pronotum and approximately 1.2 times as wide as pronotum ( Figs. 1−2 ), punctation similar to that of pronotum, but well-defined and slightly smaller; microsculpture absent. Hind wings reduced.

Abdomen wider than elytra, 1.10−1.15 times as wide as elytra ( Fig. 1 ), widest at segment VII; punctation fine, well-defined and moderately dense; all tergites with fine interstices; posterior margin of tergite VII without palisade fringe.

Male terminalia and genitalia: Sternite VII transverse and distinctly modified, with semi-circular median impression and broadly concave posterior margin, median impression bearing short, stout and black setae ( Fig. 3 ); sternite VIII as long as wide, posterior margin of sternite VIII with triangular median emargination, without modified pubescence along median line ( Fig. 4 ). Aedeagus large ( Figs. 7−10 ), approximately 1.3 mm long, ventral process long, basally broad and increasingly narrowed apically in ventral view, with a hook-shaped protrusion apically in lateral view; apical sclerotized structure of internal sac shaped like a basally and apically curved and elongated spine in lateral view ( Fig. 7−8 ).

Female terminalia: Tergite VIII slightly oblong, without modified pubescence, posterior margin of tergite VIII distinctly convex ( Fig. 5 ); sternite VIII slightly oblong and increasingly narrowed, with convex projection, and fine and dense micro-pubescence in median posterior area ( Fig. 6 ).

Comparative notes. This new species is similar to L. newtoni Anlaş, 2018 (Yozgat province) and L. celiki Anlaş, 2021 (Amasya province) but can be distinguished from these species by the different morphology of the aedeagus. It differs from L. newtoni and L. celiki by presence of a basally and apically slightly curved spine in lateral view. Additionally, this new species is distinguished from these species by the relatively larger body, by the lighter colouration of abdominal segments III–VI, by the slightly smaller concavity in the posterior margin of male sternite VIII, and by the slightly larger aedeagus.

Etymology. The name is derived from Çorum province, where the type localities are situated.

Distribution and bionomics. This new species was collected from Çağşak village environs in Çorum province ( Table 1 ). The type specimens were collected under stones in various grassland areas at altitudes of 1100−1400 m.

Figures

FIGURES 1–10. Lathrobium corumense sp. n. 1—habitus; 2—forebody; 3—male sternite VII; 4—male sternite VIII; 5— female tergite VIII; 6—female sternite VIII; 7, 8—aedeagus in lateral view; 9, 10—aedeagus in ventral view. Scale bars: 1 mm (Figs. 1−2); 0.5 mm (Figs. 3−10).