Trechus eremita Schmidt 2009, sp. n.
Creators: name: Schmidt, Joachim
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Trechus
Trechus eremita

description: Trechus eremita sp. n.   
(Figs. 29, 45, 46)  
 Type material: Holotype male, with label data “ NEPAL oc. Karnali Prov., 34 km NE Jumla, Bachtal SE Taka, 29°30’12’’N, 82°24’20’’E, 3800 m, 01.VII.1999 leg. A. Weigel ” (NME).   
Paratypes: 1 male, 2 females, with same label data as holotype (CSCHM, CWG).  
 Description: Body length: 3.1–3.4 mm.   
Colour: Dorsal surface brown, moderately shiny, head distinctly darker than pronotum, palpi, three or four basal antennal segments and legs yellowish brown.  
Microsculpture: Head with slightly engraved slightly transverse meshes on disc, and with deeply engraved almost isodiametric meshes in frontal furrows and on neck; pronotum with faintly engraved slightly transverse meshes on disc but with deeply engraved meshes throughout basal depressions. Elytra with moderately engraved slightly transverse meshes in both sexes.  
 Head: As described in T. muguensis sp. n.   
 Pronotum: Proportions: WP/LP = 1.18–1.26, WP/WPB = 1.35–1.43, WP/WH = 1.23–1.24, WE/WP = 1.58–1.65. In all other pronotal characters agreeing with T. muguensis sp. n.   
 Elytra: Proportion WE/LE = 1.42–1.52. Striae impunctate, two or three inner stria slightly stretched on elytral disc, absent at base and flattened on apex; fourth stria only suggested as a fine incomplete line, outer striae completely reduced. In all other elytral characters completely agreeing with T. muguensis sp. n.   
Male genitalia: Aedeagal median lobe elongate (LE/LA = 1.63–1.65), in lateral view strongly curved behind basal bulb, almost straight in the middle portion, distinctly bent upwards at the beginning of distal quarter, with undulate curve at apex; ventral side slightly widened in middle. In dorsal view, right side of median lobe slightly widened at the beginning of distal quarter; tip of terminal lamella produced, rounded. Internal sac with sclerotized portion relatively small, strongly flattened in lateral view.  
 Etymology: The specific epithet is used as a noun in apposition, and refers to the Latinized Greek word ‘eremita’, a hermit.   
 Identification: In external characters almost identical to T. franzianus Mateu & Deuve, 1979 and the forgoing described T. muguensis sp. n., but elytral micromeshes in females not so deeply engraved. In addition, T. eremita sp. n. differs from both these species by its aedeagal characters: The median lobe is more elongated than in T. muguensis sp. n., with its basal bulb not so strongly bent downwards, but with its apical portion more distinctly curved upwards. In dorsal view, the median lobe is more slender than that of T. franzianus, and not widened behind middle on its left side. For differentiation with the newly described species T. aedeagalis sp. n. and T. sculptipennis sp. n. see diagnosis of the latter below.   
 Relationships: See remarks in chapter Relationships of T. tilitshoensis Schmidt, 1994.   
 Distribution: Fig. 98. North slope of Sisne Himal, Western Nepal Himalaya. Up to now only known from the southern side valley of Mugu Karnali River South East of Taka.   
 Habitat: The few specimens of the type series were found under big stones on subalpine meadows beside a brook at an altitude of 3800 m. However, the vertical distribution of the species truly extends to the alpine zone.
description: Published as part of Schmidt, Joachim, 2009, Taxonomic and biogeographical review of the genus Trechus Clairville, 1806, from the Tibetan Himalaya and the southern central Tibetan Plateau (Coleoptera: Carabidae: Trechini) 2178, pp. 1-72 in Zootaxa 2178 (1) on pages 28-29, DOI: 10.11646/zootaxa.2178.1.1, http://zenodo.org/record/5312276