Lathrobium (Lathrobium) tokatense, 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 : 217-219

Lathrobium (Lathrobium) tokatense sp. n. ( Figs. 1−11 )

urn:lsid:zoobank.org:act:6D47B9D6-F8A0-4830-9256-B1DBB420A726

Type material. Holotype: Turkey: ♂, “TR. Tokat, Topçam Dağı, Çamdere 6 km S, 1484 m, 40°25'38''N, 36°33'08''E, 28.IV.2021, leg. Anlaş, Kacar & Çelik. / Holotypus ♂, Lathrobium (Lathrobium) tokatense sp. n. det. S. Anlaş 2021 ” ( AZMM) . Paratypes: 4 ♀♀, same data as holotype ( AZMM) . 1 ♂, 1 ♀, Tokat, Çamlık 7 km SE, 1240 m, 40°27'19''N, 36°33'09''E, 07.VII.2021, leg. Örgel, Kacar & Çelik ( AZMM) . 1 ♂, 3 ♀♀, Tokat, Çamlık 6 km E, 1508 m 40º25'37"N, 36º33'07"E, 19.XI.2021, by MSS traps ( AZMM) . 1 ♂, 2 ♀♀, Tokat, Şehitler 2 km NE, 1338 m, 40º31'16"N, 36º35'31"E, 19.XI.2021, by MSS traps ( AZMM) .

Description. Measurements (in mm) and ratios (range, n = 14): AL: 1.25-1.32, 1.29; HL: 0.58-0.64, 0.60; HW: 0.46-0.54, 0.50; PL: 0.63-0.70, 0.66; PW: 0.41-0.49, 0.45; EL: 0.32-0.37, 0.34; EW: 0.50-0.60, 0.56; AW: 0.58- 0.69, 0.63; ML: 1.11-1.18, 1.14 (n=4); FL: 3.7-3.8, 3.8; TL: 4.3-4.5, 4.4; HL/HW: 1.19-1.26, 1.24; PW/HW: 0.89- 0.91, 0.90; PW/PL: 0.65-0.70, 0.68; EL/PL: 0.51-0.53, 0.52; EW/PW: 1.22-1.22, 1.22; EL/EW: 0.62-0.64, 0.63; AW/EW: 1.15-1.16, 1.16.

Habitus as in Figure 1 . Body 4.3−4.5 mm long. Colouration: whole body uniformly rufous, posterior margin of abdominal segments III–VI more or less blackish; antennae and legs reddish brown.

Head oblong, ( Figs. 1−2 and see ratios HL/HW); integument with shallow fine microreticulation; punctation non-umbilicate, sparse and smaller in median dorsal area; interstices on average slightly wider than diameter of punctures in lateral areas and wider in median dorsal area; pubescence reddish brown and very sparse; eyes strongly reduced, not clearly visible in dorsal view; ommatidia indistinct but darkly pigmented ( Fig. 3 ). Antennae long and slender ( Fig. 1 ), approximately 1.3 mm long, all antennomeres oblong.

Pronotum distinctly oblong approximately 0.9 times as wide as head and narrowed posteriorly ( Figs. 1−2 , see ratios PW/PL and PW/HW); punctation similar to that of head, but slightly denser and larger, medial line impunctate; pubescence reddish brown and very sparse; microsculpture absent.

Elytra distinctly shorter than pronotum, and widened posteriad, approximately 1.2 times as wide as pronotum ( Figs. 1−2 and see ratios EW/PW), punctation rather sparse, shallow, and irregularly spaced; microsculpture absent. Hind wings completely reduced.

Abdomen wider than elytra, approximately 1.15 times as wide as elytra ( Fig. 1 and see ratio AW/EW), widest at segment VII; puncturation mixed large and small; large punctures sparse, small ones shallow, moderately dense and well-defined; microsculpture present, composed of dense and fine transverse meshes and striae; posterior margin of tergite VII without palisade fringe.

Male: sternite VII unmodified, without modified setae, posterior margin shallowly concave ( Fig. 4 ), posterior incision of sternite VIII in the middle increasingly narrowed and deep, pubescence unmodified ( Fig. 5 ). Aedeagus large, approximately 1.10−1.15 mm long, almost symmetrical, with a small protrusion apically in ventral view, ventral process apically acute in lateral view ( Figs. 8−11 ).

Female: tergite VIII unmodified, without modified setae ( Fig. 6 ); sternite VIII strongly modified but without modified setae, posterior margin of sternite VIII distinctly asymmetrical, with three unequal protrusions, spineshaped one on the right ( Fig. 7 ).

Comparative notes. This new species is the ninth representative of the microphthalmous Lathrobium recorded from Turkey. The species can be distinguished from all its congeners except L. brignolii Bordoni, 1980 , L. distortum Assing, 2007 and L. deforme Assing, 2007 , by the strongly reduced eyes, without ommatidia. It differs from L. brignolii , L. distortum and L. deforme in the aedeagal structures, and the following features:

- from L. brignolii Bordoni , in a much more elongate head ( L. brignolii : head approximately 1.10 times as long as wide), and pronotum ( L. brignolii : pronotum approximately as wide as long); longer antennae ( L. brignolii : 0.85‒0.90 mm long); larger aedeagus ( L. brignolii : approximately 0.80‒0.85 mm long); a different shape of the male sternite VIII ( L. brignolii : deeply and rather sharply incised posteriorly); the female tergite VIII ( L. brignolii : posterior margin distinctly pointed); and the female sternite VIII ( L. brignolii : posterior margin distinctly convex).

- from L. distortum Assing in a much more elongate head ( L. distortum : head approximately 1.08 times as long as wide); less pronounced microreticulation of the head; a larger aedeagus ( L. distortum : 0.60‒0.65 mm long), a different shape of the male sternite VIII ( L. distortum : posterior excision very broad and not very deep); and the female sternite VIII ( L. distortum : posterior margin obtusely pointed).

- from L. deforme Assing in a much more elongate head ( L. deforme : head approximately as wide as long) and pronotum ( L. deforme : pronotum approximately 1.3 times as long as wide); a larger aedeagus ( L. deforme : 0.90 mm long); a different shape of the male sternite VIII ( L. deforme : posterior excision broad and moderately deep); the female tergite VIII ( L. deforme : posterior margin weakly angled in the middle); and the female sternite VIII ( L. deforme : posterior margin strongly convex).

For descriptions and illustrations of the above species, see Bordoni (1980), and Assing (2001, 2007).

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

Distribution and bionomics. This new species was collected on Topçam Mountain, in Tokat province. Beetles were collected in mixed forest by sifting litter at altitudes of 1240 and 1480 m, and some of them were collected using subterranean pitfall traps at altitudes of 1340 and 1510 m.

Figures

FIGURES 1–11. Lathrobium tokatense sp. n. 1—habitus; 2—forebody; 3—head in lateral view; 4—male sternite VII; 5—male sternite VIII; 6— female tergite VIII; 7— female sternite VIII; 8, 9— aedeagus in lateral view; 10, 11— aedeagus in ventral view. Scale bars: 1.0 mm (Figs. 1−2); 0.2 mm (Figs. 3−11).