Trechus sanettii 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 sanettii

description: Trechus sanettii sp. nov.
urn:lsid:zoobank.org:act: ED365F36-D797-498A-AE53-46C389582C7C
Figs 81, 85, 89, 126–127
Diagnosis
Externally, this new species is very similar to T. ericalis, and the below newly described T. abalkhasimi sp. nov., T. angovaensis sp. nov., T. grandipennis sp. nov. and T. fisehai sp. nov., but it differs by the elytra which are not iridescent, and by the elytral microsculpture which consists of larger, less transverse meshes with more deeply engraved lines. It differs additionally by the median lobe with endophallic copulatory piece located in the centre of the median lobe while in the aforementioned species this piece is shifted more apicad and differently shaped. For additional differential characters see Identification chapters of the respective species below.
Etymology
The specific epithet is derived from the Sanetti Plateau of the Bale Mts, of which the southeastern margin is the type locality of the new species.
Material examined
Holotype
ETHIOPIA: ³, Bale Mts, Sanetti Plateau, near Mt Abalk-hasim, alt. 3600–3800 m, 06°45′12″ N, 39°49′36″ E, Feb. 2007 (CSCHM, registration number ZSM _COL_2018_018).
Paratypes
ETHIOPIA: 20 ³³, 13 ♀♀, same data as for holotype (CAF, CSCHM); 197 exx (³³, ♀♀), same data as for preceding but alt. 3760 m, 10 Dec. 2017, 06°45′10″ N, 39°49′36″ E (NHMUK, CAF, CDH, CSCHM, MNHN, ZMAA).
Description
BODY LENGTH. 3.7–4.6 mm (Ø = 4.2 mm, n = 20).
PROPORTIONS (n = 10). PW/HW = 1.41–1.47 (Ø = 1.44); PW/PL = 1.31–1.44 (Ø = 1.36); PW/PBW = 1.23–1.29 (Ø = 1.26); EW/PW = 1.54–1.69 (Ø = 1.64); EL/EW = 1.30–1.40 (Ø = 1.35).
COLOUR. Head, pronotum and elytra blackish brown, elytra silk-shiny, not iridescent, lateral margins of labrum and elytra reddish brown lightened. Basal maxillary palpomere, apex of apical palpomere, antennal base and legs light brown; middle portion of palps dark brown, antennae distally darkened beginning from second antennomere.
MICROSCULPTURE. Same in males and females. Head with rather large, deeply engraved, almost isodiametric meshes on disc and supraorbital area, and smaller, slightly engraved meshes on clypeus. Pronotum with moderately large, slightly transverse meshes. Elytra with rather large, more deeply engraved, slightly transverse meshes.
HEAD. Size average for Trechus. Mandibles moderately short. Labrum with apical margin widely emarginated. Eyes moderately large, moderately convexly protruded. Tempora moderately short, convex, markedly wrinkled to the neck, about 0.6 times as long as eyes, very sparsely and very finely pubescent. Frons and supraorbital area strongly convex, with supraorbital furrows almost uniformly bent on disc, deep throughout. Length of antennae average for Trechus, proportions of the first four antennomeres as follows: 1/0.8/0.95/0.95.
PROTHORAX. Pronotum comparatively small, transverse, suggestively discoidal, broadest portion distinctly before middle, base distinctly wider than apical margin. Disc moderately convex. Anterior margin moderately concave with anterior angles slightly protruded, rounded. Sides almost evenly rounded throughout, laterobasal angles very obtuse, marked as a very small blunt tooth. Marginal gutter narrow in anterior 4 /5, slightly widened near laterobasal angles. Base straight in middle, markedly bent anteriorly at outer quarters. Median longitudinal impression very fine, not deepened near base, disappearing at apex; anterior transverse impression very shallow or indistinct, smooth; posterior transverse impression moderately shallow, smooth or finely rugose; laterobasal foveae moderately deep, roundish, smooth. Pronotum with laterobasal setae present.
PTEROTHORAX. Elytra markedly convex on disc, not or very slightly flattened if viewed from behind, in dorsal view broad oval, broadest in mid-length, with shoulders shallowly rounded; apex rounded. Striae impunctate or suggestively punctate, parascutellar stria short, shallow, striae 1–3 moderately finely impressed, 4 and 5 very fine, 6–7 usually absent, 8 deeply impressed from level of the middle group of the marginal umbilicate pores towards apex. Internal three intervals very slightly convex. Recurrent preapical stria deep, moderately short, slightly curved in front, directed to the seventh stria. Third stria with two setiferous dorsal pores, the anterior one near the end of the elytral anterior fifth, the posterior one slightly before middle, and with preapical seta which is situated at the apical anastomosis of second and third striae, almost as close to the elytral apex as to the suture. Number and positions of the setae of the marginal umbilicate series as in Trechus s. str.
LEGS. Moderately short and thin; protibia slightly dilated towards apex, almost straight, distinctly grooved on external surface. Two basal protarsomeres of male dilated.
MALE GENITALIA. EL/AL = 2.54–2.89 (Ø = 2.73, n = 8). Aedeagal median lobe moderately short, in lateral view more markedly bent behind basal bulb, its ventral margin somewhat straight in middle, bent downward before apex, its dorsal margin convex; apical lamella moderately long, slightly bent upward at tip; basal bulb large, sagittal aileron markedly small. Endophallic copulatory piece moderately sclerotized, moderately small, located in centre of median lobe, in lateral view sloping, in dorsal view sickle-shaped.
Distribution
Endemic to the southeastern margin of the Sanetti Plateau of the Bale Mts near Mt Abalk-hasim. The species was collected at altitudes between 3600 m and 3800 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 52-53, DOI: 10.5852/ejt.2018.446, http://zenodo.org/record/3829902