Trechosiella Jeannel, 1960: 48

Geginat, Gernot, 2013, Taxonomic revision of the African genus Trechosiella Jeannel (Coleoptera: Carabidae: Trechinae), Zootaxa 3716 (3), pp. 441-459 : 442

Trechosiella Jeannel, 1960: 48

Type species: Trechosiella basilewskyi Jeannel, 1960 ; fixation of type species by original designation.

Description. Body elongate ovoid, flattened, glabrous. Eyes glabrous, generally large, protruding, rarely reduced. Temporal lobes well developed, convex and protruding. Two supraorbital setiferous punctures present, anterior seta in the middle and posterior seta at posterior margin of temporal lobe, respectively. Frons with moderately deep furrows, not canaliculate, continued anteriad towards anterior margin of clypeus. Clypeus hexagonal, laterally with two setae projecting anteriad. Labrum oblong, anterior margin concave, with six setae projecting anteriad. Antennae moderately long, antennomeres longer than broad. Medial surface of scape with multiple setae projecting mediad, lateral surface with a single long seta projecting anteriad; antennomeres 2–11 with numerous setae. Mentum transverse, mentum tooth bifid. Suture between mentum and submentum distinct and entire. Posterior central recess of mentum with two long setae projecting anteriad. Anterior margin of ligula triangular or obtuse, bearing two long setae medially and three shorter setae on each side. Penultimate maxillary palpomere clubshaped, distally dilated. Apical palpomere cone-shaped in maxillary palps, spindle-shaped in labial palps. Penultimate labial palpomere with four long setae, two on distal half of medial surface, projecting mesad, two at distal third of distolateral surface, projecting distad. Pronotum cordiform, slightly transverse, hind angles rectangular, posterior margin straight, base with deep impression on each side. Posterior seta of pronotum inserted in marginal groove just anterior of hind angle, anterior seta inserted at a point just anterior of maximum width of pronotum. Elytra ovoid, shoulders prominent or rounded. Scutellar stria present; elytron with 8 striae discernible in most species, 7th stria effaced, 8th stria strongly impressed. Recurrent sutural stria weakly impressed, confluent with 5th or 7th stria. Third stria with two setiferous punctures. All setae of series umbilicata regular, inserted in 8th stria. Setiferous punctures of subhumeral group of series umbilicata regular; two anterior setae of apical group of series umbilicata positioned anteriorly, separated from two posterior setae. Anterior seta of apical series well developed, at end of second stria; posterior setae of apical series small, inconspicuous, located in recurrent sutural stria. Microsculpture of elytra transverse. Macropterous, brachypterous or apterous. Legs slender, cleaning organ well developed. Two proximal tarsomeres of male protarsi enlarged medially, with a medial tooth projecting anteriad. Aedeagus moderately elongate, internal sac mostly without prominent sclerotized structures, styles with 5 to more than 20 apical setae.

Diagnosis. Small trechines, body length 2.5–4.5 mm. Distinguished from all other Afrotropical Trechinae by the combination of a cordiform pronotum, regular striation of the elytra, and an inconspicuous recurrent sutural stria.