Trechus (Abunetrechus) bipartitus Raffray, 1885

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) bipartitus Raffray, 1885

Figs 17 , 18 , 23 , 24-25

Trechus bipartitus Raffray, 1885: 318; locus typicus: "col du mont Abouna-Yousef (4024 m)".

Trechus bipartitus : Jeannel 1927: 194.

Trechus bipartitus : Pawłowski 2003: 157.

Trechus bipartitus : Ortuño and Novoa 2011: 137.

Trechus (s. str.) bipartitus : Quéinnec et al. 2021: 20.

Type material.

Not studied. The lectotype was designated by Quéinnec et al. (2021). Identification is based on the redescriptions of the species, including habitus and male genital figures of the type specimens, presented by Jeannel (1927) and Quéinnec et al. (2021), as well as on comprehensive material collected at the type locality (see below).

Additional material.

6 males, 9 females, Ethiopia, Amhara, Mt. Abuna Yosef , N-slope, 3800-3950 m, 12°07'52"N, 39°11'39"E, 4.III.2019, leg. D. Hauth, J. Schmidt, Yeshitla M., Yitbarek W. (CAF, CSCHM) ; 6 males, 12 females, ditto, S-slope, 3850-3900 m, 12°07'29"N, 39°11'21"E, 5.III.2019, leg. D. Hauth, J. Schmidt, Yeshitla M., Yitbarek W. (CSCHM, NHMAA) ; 5 males, 2 females, ditto, S-slope, 3700-3850 m, 12°09'10"N, 39°09'35"E, 5.III.2019, leg. D. Hauth, J. Schmidt, Yeshitla M., Yitbarek W. (CSCHM) .

Additions to the species description.

Mature species with elytra including suture blackish brown ( Quéinnec et al. 2021: "suture distinctly brown shiny"; this information is probably based on confusion with T. habeshanicus ). Body length 4.1-4.7 mm ( Quéinnec et al. 2021: "> 4.5 mm"). Length of aedeagus 0.98-1.05 mm. PW/PL = 1.29-1.37; n = 20 ( Quéinnec et al. 2021: PW/PL = 1.6; this value is very probably based on a measurement error). PW/TL = 1.06-1.15; n = 20. EL/AL = 2.15-2.46; n = 10.

Differential diagnosis.

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

Distribution.

Endemic to the Abune Yosef Mountains of the northern Ethiopian Highlands.

Habitat.

As in T. (Abunetrechus) lalibelae Quéinnec & Ollivier (see below).

Figures

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.

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.