Trechus oppositus 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 oppositus

description: Trechus oppositus sp. nov.
urn:lsid:zoobank.org:act: 71A0EAC2-C525-4C4D-A685-0BEC8A8911E7
Figs 15, 19, 23, 48–49
Diagnosis
In external characters very similar to T. relictus and T. iridescens sp. nov., both from the eastern part of Bale Mts. Trechus oppositus sp. nov. differs from these species by distinctly more robust aedeagal median lobe with broader copulatory piece of endophallus. It differs additionally from T. relictus by iridescent and broader elytra, and from T. iridescens sp. nov. by less dark colour of body, smaller pronotum with lateral margin less markedly bent anteriorly and with base approximately as broad as apical margin.
Etymology
The specific epithet is derived from the Latin adjective“ oppositus ” and refers to the particular distributional patterns of this species with respect to its probable close relatives, T. relictus and T. iridescens sp. nov., which both occur on the eastern and thus opposite site of the Bale Mts.
Material examined
Holotype
ETHIOPIA: ³, Oromia, western Bale Mts, above Dodola, alt. 3400–3700 m, 06°51′ N, 39°14′ E, Dec. 2006 (CSCHM, registration number ZSM _COL_2018_007).
Paratypes
ETHIOPIA: 9 ³³, 5 ♀♀, same data as for holotype (CAF, CSCHM).
Description
BODY LENGTH. 2.6–3.1 mm (Ø = 2.9 mm; n = 15).
PROPORTIONS (n = 10). PW/HW = 1.30–1.40 (Ø = 1.34); PW/PL = 1.41–1.51 (Ø = 1.45); PW/PBW = 1.21–1.29 (Ø = 1.25); EW/PW = 1.51–1.63 (Ø = 1.56); EL/EW = 1.27–1.36 (Ø = 1.32).
COLOUR. Head, pronotum, and elytra blackish brown. In all other characters as described in T. iridescens sp. nov.
MICROSCULPTURE. As described in T. iridescens sp. nov.
HEAD. Tempora 1.15 times longer than eyes. In all other characters as described in T. iridescens sp. nov.
PROTHORAX. Pronotum moderately large, with broadest portion distinctly before middle and with base as wide as apical margin. In all other characters as described in T. rira sp. nov.
PTEROTHORAX. As described for T. iridescens sp. nov.
LEGS. As described for T. iridescens sp. nov.
MALE GENITALIA. EL/AL = 2.83–3.03 (Ø = 2.94, n = 6). Aedeagal median lobe moderately small, moderately robust, in lateral view more markedly bent in basal half, with ventral margin almost straight in middle; apical lamella moderately long with distinct button-like apical capitulum; basal bulb and sagittal aileron average. Endophallus with copulatory piece bag-like, triangular in lateral and dorsal view, arcuate towards apex, slightly sclerotized throughout.
Distribution
Known only from the type locality, the western part of Bale Mts, on the northern slope of the mountain range south of the city Dodola, at altitudes of 3400–3700 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 21-22, DOI: 10.5852/ejt.2018.446, http://zenodo.org/record/3829902