Trechus depressipennis, 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 : 32-34

Trechus depressipennis sp. nov.

urn:lsid:zoobank.org:act:6FEF0E44-C6B1-4C6A-93CA-4C3F0F8757C4

Figs 67 , 71 , 75 , 115

Diagnosis

Within the Trechus fauna of the study area this species is easily recognizable by the combination of the following characters: elytral microsculpture consists of rather large, very slightly transverse meshes; eyes moderately large; pronotal laterobasal angles large and acute; sides of pronotal base not protruded posteriorly; two basal protarsomeres of male dilated.

Etymology

The specific epithet refers to the depressed elytra which is a distinctive character of the new species.

Material examined

Holotype

ETHIOPIA: ³, Oromia, env. Wasama Camp , alt. 3900–4150 m, 23–25 Feb. 2013, 06°55′ N, 39°46′ E, ( CSCHM, registration number ZSM _COL_2018_013).

Paratype

ETHIOPIA: 1 ♀, same data as for holotype ( CSCHM).

Description

BODY LENGTH. 4.2–4.6 mm (n = 2).

PROPORTIONS (n = 2). PW/HW = 1.33–1.34; PW/PL = 1.33–1.38; PW/PBW = 1.25–1.30; EW/PW = 1.51–1.54; EL/EW = 1.44.

COLOUR. Head, pronotum and elytra blackish brown, moderately shiny; lateral margin of labrum, palpi, antennal base and legs middle brown; antennae distally darkened beginning from the second or third antennomere.

MICROSCULPTURE. Same in male and female. Head with rather large and deeply engraved almost isodiametric meshes on neck and in supraorbital furrows, more slightly engraved meshes on disc, and smaller meshes on clypeus. Pronotum with rather small, very finely engraved slightly transverse meshes on disc, and deeply engraved meshes near base. Elytra with rather large and deeply engraved, slightly transverse or somewhat irregularly formed meshes.

HEAD. Size normal for Trechus . Mandibles moderately short. Labrum with apical margin widely emarginated. Eyes moderately large, moderately convex. Tempora convex, markedly wrinkled to the neck, almost half as long as eyes, very finely and very sparsely pubescent. Frons and supraorbital area strongly convex, with supraorbital furrows somewhat unevenly bent on disc, deep in middle, shallower near posterior supraorbital seta. Antennae moderately slender, proportions of the first four antennomeres as follows: 1/0.8/0.9/0.8.

PROTHORAX. Pronotum average for Trechus , moderately transverse, broadest portion slightly before middle, base slightly wider than apical margin. Disc slightly convex. Anterior margin slightly concave with anterior angles slightly protruded, rounded. Sides convexly rounded in anterior 4 /5, concave before base. Laterobasal angles moderately large, slightly acute, slightly protruded laterally. Marginal gutter moderately narrow, distinctly widened near laterobasal angles. Base straight in middle, slightly bent anteriorly at outer quarter. Median longitudinal fine, not deepened near base, disappearing at apex; anterior transverse very shallow, smooth; posterior transverse impression moderately shallow; laterobasal foveae moderately large, roundish, moderately deep, smooth. Pronotum with laterobasal setae present.

PTEROTHORAX. Elytra distinctly flattened on disc, in dorsal view oval, broadest in mid-length, with shoulders and apex broadly rounded. Striae very finely punctate, parascutellar stria moderately long, deep, striae 1–4 deeply impressed, 5 and 6 finer, 7 and anterior part of 8 indistinct, 8 deeply impressed from level of the middle group of the marginal umbilicate pores towards apex. Internal 3 intervals moderately convex. Recurrent preapical stria deep, long, curved in front, directed to the end of the seventh stria. Third stria with two setiferous dorsal pores, the anterior one near the end of the anterior elytral quarter, the posterior one slightly behind middle, and with preapical seta which is situated at the apical anastomosis of second and third striae, somewhat closer to elytral apex than to suture. Number and positions of the setae of the marginal umbilicate series as in Trechus s. str.

LEGS. Moderately short and comparatively thin; protibia slightly dilated towards apex, almost straight, distinctly grooved on external surface. Two basal protarsomeres of male dilated.

MALE GENITALIA. EL/AL = 2.73 (n = 1). Aedeagal median lobe moderately large, in lateral view with ventral margin more markedly bent behind basal bulb, almost straight towards apex; apical lamella moderately short, very oblique, button-like, pointed with tip shortly bent upward; basal bulb average with sagittal aileron small. Endophallic copulatory piece moderately large, somewhat cone-shaped, but with upward bent tip.

Distribution

Endemic to the northern slope of the Bale Mts; only known from the Wasama Valley. The species was found at altitudes of 3900–4150 m.

Figures

Figs 67–70. Trechus spp., habitus. 67. T. depressipennis sp. nov., holotype. 68. T. mekbibi sp. nov., paratype, ³. 69. T. hagenia sp. nov., paratype, ³. 70. T. colobus sp. nov., paratype, ³.

Figs 71–74. Trechus spp., head, pronotum. 71. T. depressipennis sp. nov., holotype. 72. T. mekbibi sp. nov., paratype, ³. 73. T. hagenia sp. nov., paratype, ³. 74. T. colobus sp. nov., paratype, ³.

Figs 75–78. Trechus spp., elytra. 75. T. depressipennis sp. nov., holotype. 76. T. mekbibi sp. nov., paratype, ³. 77. T. hagenia sp. nov., paratype, ³. 78. T. colobus sp. nov., paratype, ³. The arrows point to the insertions of the discal setae and the preapical seta (if present).

Figs 115–125. Trechus spp., aedeagal median lobe, left lateral view (115–116, 118, 120, 122, 124–125) and dorsal view (117, 119, 121, 123). 115. T. depressipennis sp. nov., holotype. 116–117. T. mekbibi sp. nov., paratypes. 118–119. T. hagenia sp. nov., paratypes. 120–121. T. colobus sp. nov., paratypes. 122–123. T. wiersbowskyi sp. nov., paratypes. 124. T. haggei sp. nov., paratype. 125. T. grandipennis sp. nov., holotype.