Lathrobium (Lathrobium) amasiacum, Anlaş, 2022

Anlaş, Sinan, 2022, On the microphthalmous Lathrobium Gravenhorst species of Turkey III. Two new species from central northern Anatolia, and an updated key to Turkish species (Coleoptera: Staphylinidae: Paederinae), Zootaxa 5124 (2), pp. 216-222 : 219-221

Lathrobium (Lathrobium) amasiacum sp. n. ( Figs. 12−22 )

urn:lsid:zoobank.org:act:DA8DEA0D-9CD3-4EA5-9CE3-E2AF25E3390D

Type material. Holotype: Turkey: ♂, “TR. Amasya, Taşova, Borabay Gölü 8 km SE, 1059 m, 40°51'02''N, 36°06'55''E, 24.IV.2021, leg. Anlaş, Kacar & Çelik. / Holotypus ♂, Lathrobium (Lathrobium) amasiacum sp. n. det. S. Anlaş 2021 ” ( AZMM) . Paratypes: 2 ♂♂, 2 ♀♀, same data as holotype ( AZMM) . 1 ♀, Amasya, Taşova, Borabay Gölü 7 km SE, 1100 m, 40°51'17''N, 36°07'16''E, 17.VI.2020, leg. Örgel & Kacar ( AZMM) . 1 ♂, 2 ♀♀, Amasya, Taşova, Küpecik 7 km NW, 1015 m, 40°51'17''N, 36°07'15''E, 24.IV.2021, leg. Anlaş, Kacar & Çelik ( AZMM) . 1 ♂, 3 ♀♀, Amasya, Taşova, Borabay Gölü 7 km NW, 1100 m, 40°51'17''N, 36°07'16''E, 24.IV.2021, 16.XI.2021, by MSS traps ( AZMM) . 2 ♀♀, Amasya, Taşova, Tatlıpınar 3 km NE, 1159 m, 40º39'20"N, 36º14'54"E, 16.XI.2021, by MSS traps ( AZMM) . 1 ♂, 1 ♀, Amasya, Taşova, Boraboy Gölü 3 km SE, 1148 m, 40º49'14"N, 36º09'41"E, 16.XI.2021, by MSS traps ( AZMM) .

Description. Measurements (in mm) and ratios (range, n = 17): AL: 1.32-1.38, 1.36; HL: 0.55-0.62, 0.58; HW: 0.46-0.54, 0.50; PL: 0.63-0.71, 0.67; PW: 0.44-0.50, 0.47; EL: 0.30-0.36, 0.33; EW: 0.50-0.57, 0.54; AW: 0.54- 0.62, 0.57; ML: 1.02-1.09, 1.05 (n=6); FL: 3.6-3.8, 3.7; TL: 4.1-4.5, 4.3; HL/HW: 1.15-1.20, 1.17; PW/HW: 0.93- 0.96, 0.95; PW/PL: 0.70-0.71, 0.70; EL/PL: 0.48-0.51, 0.49; EW/PW: 1.13-1.14, 1.14; EL/EW: 0.60-0.63, 0.62; AW/EW: 1.08-1.09, 1.09.

Habitus as in Figure 12 . Body 4.1−4.5 mm long. Colouration: whole body uniformly rufous, posterior margin of abdominal segments III–VI distinctly blackish; antennae and legs reddish brown.

In general appearance similar to L. tokatense , but it can be distinguished as follows: colouration of posterior margin of abdominal segments III–VI darker than in L. tokatense ; head approximately 1.15–1.20 times as long as wide ( Figs. 12−13 and see ratios HL/HW), punctation slightly denser and much more distinct than that in L. tokatense , antennae 1.32−1.38 mm long; eyes strongly reduced, with indistinct cornea lenses, but with pigmentation, slightly larger than those in L. tokatense ( Fig. 14 ); pronotum longer than wide, approximately 1.4 times as long as wide, punctation much more distinct than that of L. tokatense ( Figs. 12−13 and see ratios PW/PL); elytra broader than pronotum ( Figs. 12−13 and see ratios EW/PW); abdomen slightly wider than elytra approximately 1.1 times as wide as elytra ( Fig. 12 and see ratios AW/EW).

Male: sternite VII with a conspicuous clusters of dense dark setae and slightly concave middle of the posterior margin ( Fig. 15 ), posterior incision of sternite VIII distinctly asymmetrical, less than 1/3 as long as length of the sternite; pubescence unmodified ( Fig. 16 ). Aedeagus large, almost symmetrical, with a protrusion bent apically in ventral view ( Figs. 19−22 ).

Female: posterior margin of tergite VIII weakly angled in middle, pubescence unmodified ( Fig. 17 ), sternite VIII oblong, its posterior margin convex, pubescence unmodified ( Fig. 18 ).

Comparative notes. This new species can be distinguished from the geographically closest congeners, i.e., other species with similarly reduced eyes and without cornea lenses, by different shapes of the male and female primary and secondary sexual characters (see key to the microphthalmous Lathrobium species of Turkey).

Etymology. The name refers to Amasya, the type locality.

Distribution and bionomics. This species was collected at six localities in Borabay lake environs in Amasya province of the central northern Anatolia. The type specimens were collected in various kinds of forest by sifting litter at altitudes of 1015 and 1100 m and some specimens were found in MSS traps at altitudes of 1100 and 1160 m.

Figures

FIGURES 12–22. Lathrobium amasiacum sp. n. 12—habitus; 13—forebody; 14—head in lateral view; 15—male sternite VII; 16—male sternite VIII; 17— female tergite VIII; 18— female sternite VIII; 19, 20— aedeagus in lateral view; 21, 22— aedeagus in ventral view. Scale bars: 1.0 mm (Figs. 12−13); 0.2 mm (Figs. 14−22).