Trechus (Abunetrechus) habeshanicus Queinnec & Ollivier

Faille, Arnaud, Hofmann, Sylvia, Merene, Yeshitla, Hauth, David, Opgenoorth, Lars, Woldehawariat, Yitbarek & Schmidt, Joachim, 2023, Explosive radiation versus old relicts: The complex history of Ethiopian Trechina, with description of a new genus and a new subgenus (Coleoptera, Carabidae, Trechini), Deutsche Entomologische Zeitschrift 70 (2), pp. 311-335 : 311

Trechus (Abunetrechus) habeshanicus Queinnec & Ollivier

Figs 21 , 22 , 28 , 29

Trechus (Abunetrechus) habeshanicus : Quéinnec et al. 2021: 23; locus typicus: Guassa Plateau 10°17'19"N, 39°48'13"E.

Type material.

Not studied. Identification is based on the original description, including habitus and male genital figures of the type specimens ( Quéinnec et al. 2021), as well as on comprehensive material collected at the type locality (see below).

Additional material.

98 exx. (males, females), Ethiopia, Amhara, northern Guassa Plateau , near Guassa Comm. Lodge 3330 m, 10°17'17"N, 39°47'54"E, 18.V.2022, leg. J. Schmidt, Yeshitla M. (CAF, CSCHM, NHMAA); 360 exx. (males, females), ditto, "Aste wuha" 3400 m, 10°24'N, 39°48'E, 19.V.2022, leg. J. Schmidt, Yeshitla M. (CAF, CSCHM, NHMAA); 11 exx. (males, females), ditto, "Yegana Natural Forest", river valley, 3125 m, 10°26'03"N, 39°47'16"E, 20.V.2022, leg. J. Schmidt, Yeshitla M. (CSCHM) .

Additions to the species description.

Mature species with elytra blackish brown, and with suture and first interval reddish brown lightened in most specimens ( Quéinnec et al. 2021: "suture distinctly darkened"; this information is probably based on confusion with T. bipartitus ). Body length 4.1-5.0 mm ( Quéinnec et al. 2021: 4.1-4.3 mm). Length of aedeagus 0.70-0.80 mm. PW/PL = 1.28-1.38; n = 20. PW/TL = 1.08-1.13; n = 20. EL/AL = 3.00-3.33; n = 10.

Differential diagnosis.

See Key to species of the subgenus Trechus Abunetrechus , below.

Distribution.

Endemic to the Guassa Plateau of the northern Ethiopian Highlands.

Habitat.

Specimens of T. habeshanicus were found syntopic with T. guassaensis ( Quéinnec & Ollivier) and two hitherto undescribed Trechus species in humus and rotten plant material along brooks in the afromontane zone.

Figures

Figures 21 - 23. Trechus subgenus Abunetrechus nov., dorsal aspect of body (21) and head (22), and anterior part of left elytron (23). 21, 22. T. habeshaicus Queinnec & Ollivier; 23. T. bipartitus Raffray. The small white circles in Fig. 22 mark the insertion points of the clypeal setae; the arrow in Fig. 23 points to the insertion of the anterior elytral discal seta.

Figures 24 - 29. Trechus subgenus Abunetrechus nov., aedeagus in left lateral aspect (24, 26, 28) and dorsal aspect (25, 27, 29). 24, 25. T. bipartitus Raffray; 26, 27. T. lalibelae Queinnec & Ollivier; 28, 29. T. habeshaicus Queinnec & Ollivier.

Figures 17 - 20. Trechus subgenus Abunetrechus nov., dorsal aspect of body (17, 19), head and pronotum (18, 20). 17, 18. T. bipartitus Raffray; 19, 20. T. lalibelae Queinnec & Ollivier. The small white circles in Figs 18 and 20 mark the insertion points of the clypeal setae.