Trechus oppositus, Schmidt & Faille, 2018

Schmidt, Joachim & Faille, Arnaud, 2018, Revision of Trechus Clairville, 1806 of the Bale Mountains and adjacent volcanos, Ethiopia (Coleoptera, Carabidae, Trechini), European Journal of Taxonomy 446, pp. 1-82 : 21-22

publication ID	https://doi.org/ 10.5852/ejt.2018.446
publication LSID	lsid:zoobank.org:pub:56E50F4E-6A7E-4CE6-963E-3B49AA7A03B6
DOI	https://doi.org/10.5281/zenodo.3848517
persistent identifier	https://treatment.plazi.org/id/71A0EAC2-C525-4C4D-A685-0BEC8A8911E7
taxon LSID	lsid:zoobank.org:act:71A0EAC2-C525-4C4D-A685-0BEC8A8911E7
treatment provided by	Valdenar
scientific name	Trechus oppositus
status	sp. nov.

Treatment

Trechus oppositus View in CoL sp. nov.

urn:lsid:zoobank.org:act:71A0EAC2-C525-4C4D-A685-0BEC8A8911E7

Figs 15 View Figs 13–16 , 19 View Figs 17–20 , 23 View Figs 21–24 , 48–49 View Figs 37–56

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).

GoogleMaps

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.