Trechus wiersbowskyi Schmidt & Faille 2018, sp. nov.
Creators: name: Schmidt, Joachim
name: Faille, Arnaud
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Trechus
Trechus wiersbowskyi

description: Trechus wiersbowskyi sp. nov.
urn:lsid:zoobank.org:act: 4C6B2D23-ED5D-4A29-840E-4D9F927E3A88
Figs 79, 83, 87, 122–123
Diagnosis
Due to the broad oval elytra with markedly convex disc, and the laterally rounded pronotal base, this new species is very similar to T. ericalis, however, it is easily distinguishable due to the very different shape of aedeagal median lobe which is markedly tube-like in middle portion. Based on male genital morphology, T. wiersbowskyi sp. nov. seems closely related to T. bastianinii, however, it differs by the more markedly bent base of median lobe (lateral view), the truncate apical lamella (dorsal view), the dorsal surface of median lobe which is not markedly sclerotized near apical ostium, and the shape of the endophallic folding structures. In external characters, the new species differs additionally from T. bastianinii and the above-described T. colobus sp. nov. and T. hagenia sp. nov. by the shape of the pronotum with pronotal base markedly bent anteriorly at outer quarters.
Etymology
Dedicated to Mr. Daniel Wiersbowsky, Addis Ababa, for his interest in the biodiversity of Ethiopia, and for his longstanding support to entomological researches in this wonderful country.
Material examined
Holotype
ETHIOPIA: ³, Oromia, Bale Mts, S slope above Rira, alt. 3150–3250 m, 06°46′30″ N, 39°44′31″ E, Dec. 2006 (CSCHM, registration number ZSM _COL_2018_017).
Paratypes
ETHIOPIA: 19 ³³, 8 ♀♀, same data as for holotype (CAF, CSCHM); 11 ³³, 5 ♀♀, Oromia, Bale Mts, S slope above Rira, alt. 3240 m, 06°46′39″ N, 39°44′52″ E, 15 Dec. 2017 (NHMUK, CDH, CSCHM, ZMAA).
Description
BODY LENGTH. 3.8–4.5 mm (Ø = 4.26 mm, n = 20).
PROPORTIONS (n = 10). PW/HW = 1.38–1.42 (Ø = 1.40); PW/PL = 1.41–1.48 (Ø = 1.45); PW/PBW = 1.23–1.27 (Ø = 1.25); EW/PW = 1.54–1.60 (Ø = 1.57); EL/EW = 1.30–1.38 (Ø = 1.36).
COLOUR. Head, pronotum and elytra blackish brown, elytra markedly shiny, iridescent. Lateral margin of labrum, palpi, antennal base and legs light brown; antennae distally darkened beginning from second antennomere.
MICROSCULPTURE. As described in T. colobus sp. nov.
HEAD. Tempora 0.4 times as long as eyes, proportions of the first four antennomeres as follows: 1/0.9/1/0.8. In all other characters as described in T. colobus sp. nov.
PROTHORAX. Pronotum markedly transverse, broadest portion distinctly before middle, base distinctly wider than apical margin. Anterior margin concave with anterior angles slightly protruded, broadly rounded. Sides almost rounded throughout, laterobasal angles very obtuse but pointed as a small laterally protruded tooth. Marginal gutter slightly widened near laterobasal angles. Laterobasal foveae moderately large and deep. In all other characters as described in T. colobus sp. nov.
PTEROTHORAX. As described in T. colobus sp. nov.
LEGS. As described in T. colobus sp. nov.
MALE GENITALIA. EL/AL = 2.38–2.50 (Ø = 2.45, n = 8). Aedeagal median lobe elongated, in lateral view moderately bent behind basal bulb, tube-like in middle, with dorsal and ventral margins parallel, similar so in dorsal view, but slightly widened before apex; apical lamella short, broad and truncated in dorsal view, with tip distinctly bent upward in lateral view; basal bulb average, sagittal aileron large. Endophallus with two short, more markedly sclerotized folding structures, which lie on top of each other just below apical ostium, the dorsal one in dorsal view much broader, trapezoidal, in lateral view markedly bent backwards.
Distribution
The new species seems endemic to the upper Rira valley on the southern slope of the Bale Mts. It was found at altitudes of 3150–3250 m.
description: Published as part of Schmidt, Joachim & Faille, Arnaud, 2018, Revision of Trechus Clairville, 1806 of the Bale Mountains and adjacent volcanos, Ethiopia (Coleoptera, Carabidae, Trechini), pp. 1-82 in European Journal of Taxonomy 446 on pages 49-50, DOI: 10.5852/ejt.2018.446, http://zenodo.org/record/3829902