Trechus haggei 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 haggei

description: Trechus haggei sp. nov.
urn:lsid:zoobank.org:act: F38413D7-9ADB-40F7-AF8B-A8B4D96BB384
Figs 103, 107, 111, 124
Diagnosis
Within the Trechus fauna of the study area, this new species is unique due to the combination of the following characters: medium body length (approx. 4.4–4.7 mm); meshes of microsculpture on head, pronotum and elytra almost uniformly engraved, large and deeply impressed, isodiametric or very slightly transverse; pronotal base laterally markedly bent anteriorly towards very obtuse hind angles; elytra with lateral margin almost parallel in second quarter; pores of elytral discal setae dimple-like, deepened; aedeagal median lobe markedly long and slender.
Etymology
This remarkable new species is dedicated to the coleopterologist Jonas Hagge, Munich, for his contributions to the biogeography of high-altitude ground beetles of Ethiopia and High Asia.
Material examined
Holotype
ETHIOPIA: ³, Oromia, Bale Mts Finchaya Habera, 3400–3500 m, 07°00′ N, 39°43′ E, 20–21 Feb. 2013 (CSCHM, registration number ZSM _COL_2018_026).
Paratypes
ETHIOPIA: 2 ³³, 2 ♀♀, same data as for holotype (CSCHM).
Description
BODY LENGTH. 4.4–4.7 mm (Ø = 4.58 mm, n = 5).
PROPORTIONS (n = 5). PW/HW = 1.48–1.54 (Ø = 1.50); PW/PL = 1.33–1.39 (Ø = 1.35); PW/PBW = 1.29–1.33 (Ø = 1.31); EW/PW = 1.39–1.46 (Ø = 1.43); EL/EW = 1.39–1.45 (Ø = 1.42).
COLOUR. Head, pronotum and elytra dark or blackish brown, silk-shiny. Lateral margins of labrum and elytra reddish brown, lightened. Palpi, antennal base and legs light brown; antennae distally slightly darkened beginning from third antennomere.
MICROSCULPTURE. Same in males and females. Head, pronotum and elytra with rather large and deeply engraved, almost isodiametric or slightly transverse meshes.
HEAD. Size normal for Trechus. Mandibles moderately short. Labrum with apical margin widely emarginated. Eyes large, convexly protruded. Tempora moderately short, convex, markedly wrinkled to the neck, approx. 0.7 times as long as eyes, smooth. 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: 1/0.85/1.05/0.9.
PROTHORAX. Pronotum moderately large and transverse, broadest portion distinctly before middle, base slightly wider than apical margin. Disc moderately convex. Anterior margin moderately concave with anterior angles distinctly protruded, shortly rounded. Sides almost evenly rounded until laterobasal angles; latter very obtuse, very slightly protruded laterally. Marginal gutter narrow in anterior ¾, very slightly widened towards base. Base straight in middle, with lateral quarters markedly bent anteriorly. Median longitudinal impression very fine, not deepened near base, disappearing at apex; anterior transverse impression indistinct, smooth; posterior transverse impression indistinct in middle with laterobasal foveae very shallow, roundish, smooth. Pronotum with laterobasal setae present.
PTEROTHORAX. Elytra convex on disc, slightly flattened if viewed from behind, in dorsal view rather slender oval with sides almost parallel in second quarter, broadest in mid-length; shoulders and apex broadly rounded. Striae impunctate or suggestively punctate, parascutellar stria moderately long, deep, internal 1–2 striae deeply impressed, 3 very fine, 4–5 indistinct, 6–7 absent, 8 deeply impressed from level of the middle group of the marginal umbilicate pores towards apex. Internal 1–2 intervals slightly convex. Recurrent preapical stria deep, 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 anterior elytral quarter, the posterior one in middle, and with preapical seta which is situated at the apical anastomosis of second and third striae, approx. as close to the elytral apex as to the suture; pores of discal setae dimple-like, deepened. 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 = 2.28–2.34 (Ø = 2.31, n = 3).Aedeagal median lobe markedly long and slender, in lateral view more markedly bent behind basal bulb, straight in middle, and very slightly bent upward towards apex; apical lamella rather long with apex button-like pointed, latter in lateral view with its upper margin hook-like bent backwards; basal bulb average, sagittal aileron large. Endophallus poorly sclerotized throughout with copulatory piece hardly visible, spine-like.
Distribution
Endemic to the northern slope of the Bale Mts; known only from the type locality, along a brook valley (place Finchaya Habera) at altitudes of 3400–3500 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 70-73, DOI: 10.5852/ejt.2018.446, http://zenodo.org/record/3829902