Lathrobium (Lathrobium) geminum Kraatz, 1857

Haberski, Adam & Caterino, Michael S., 2024, A review of Nearctic Lathrobium (Coleoptera, Staphylinidae), with revision and descriptions of new flightless species from the mountains of the southeastern U. S., ZooKeys 1198, pp. 193-277 : 193

Lathrobium (Lathrobium) geminum Kraatz, 1857

Lathrobium bicolor Heer, 1839: 240 (junior homonym).

Lathrobium boreale Thomson, 1860: 198.

Lathrobium boreale Hochhuth, 1851: 41.

Lathrobium difficile Coiffait, 1953: 104.

Lathrobium fallaciosum Coiffait, 1953: 104.

Lathrobium obscuriceps Motschulsky, 1860: 564.

Lathrobium rufescens Motschulsky, 1860: 563.

Lathrobium volgense Hochhuth, 1851: 42.

Type material.

Types not examined.

Diagnosis.

In North America, this species is most similar to L. amplipenne . Males can be distinguished from L. amplipenne , and all other Nearctic species, by their distinctive aedeagus (Fig. 40D ), and females can be distinguished by their short gonocoxites, which are only ~ ½ as long as their paraprocts, rather than subequal as in L. amplipenne .

Description.

Large species, body length 8-11 mm; body coloration dark, appendages light brown, elytra bicolored with broad black base, rarely solid black. Gular converging, antennomeres V-VII 1.2 × as long as wide. Wing dimorphic, elytra approximately as long as pronotum. Females tergite IX with paraprocts undivided, apical lobes shorter than basal portion in dorsal view; sternite VIII with truncate apex; valvifers and coxites fused (Fig. 40A ). Male sternite VIII with two longitudinal patches of dark setae in posterior third, apex indistinctly emarginated. Ventral process of aedeagus distinctively shaped with apical tooth (Fig. 40D ) ( Assing and Schülke 2012).

Distribution.

Canada: BC ( Pentinsaari et al. 2019).

Remarks.

Native to the Palearctic and adventive in North America. Common in moist, open habitats ( Assing and Schülke 2012). Canadian specimens collected in wetland adjacent to lake ( Pentinsaari et al. 2019).

Figures

Figures 35 - 40. Lathrobium terminalia A female terminalia B male sternite VIII C aedeagus in ventral view D aedeagus in lateral view. 35 L. armatum 36 L. confusum 37 L. crurale 38 L. fauveli 39 L. fulvipenne 40 L. geminum. Scale bars: 1 mm.