Explosive radiation versus old relicts: The complex history of Ethiopian Trechina, with description of a new genus and a new subgenus (Coleoptera, Carabidae, Trechini) Author Faille, Arnaud https://orcid.org/0000-0003-3274-5915 Department of Entomology, Stuttgart State Museum of Natural History, Stuttgart, Germany arnaud.faille@smns-bw.de Author Hofmann, Sylvia Leibniz Institute for the Analysis of Biodiversity Change, Museum Koenig, 53113 Bonn, Germany Author Merene, Yeshitla https://orcid.org/0000-0003-2998-822X Faculty of Biology, Philipps University Marburg, Marburg, Germany & Department of Zoological Sciences, Addis Ababa University, Addis Ababa, Ethiopia & Amhara Agricultural Research Institute, Bahir Dar, Ethiopia Author Hauth, David Faculty of Biology, Philipps University Marburg, Marburg, Germany Author Opgenoorth, Lars Faculty of Biology, Philipps University Marburg, Marburg, Germany Author Woldehawariat, Yitbarek https://orcid.org/0000-0002-0918-8906 Department of Zoological Sciences, Addis Ababa University, Addis Ababa, Ethiopia Author Schmidt, Joachim General and Systematic Zoology, University of Rostock, Rostock, Germany agonumschmidt@hotmail.com text Deutsche Entomologische Zeitschrift 2023 2023-09-27 70 2 311 335 http://dx.doi.org/10.3897/dez.70.107425 journal article http://dx.doi.org/10.3897/dez.70.107425 1860-1324-2-311 8D3E277C424C440B8FE878085239C2A2 65D0B2390EBE553382C9727ECC9CBF8F Baehria separata Schmidt & Faille, sp. nov. Figs 4-7 , 8-15 Type material. Holotype male, with label data: Ethiopia, Amhara, Mt. Choke, crater valley, alt. 3780-3900 m, 10°42'12"N , 37°50'58"E , 27.II.2019, leg. D. Hauth, J. Schmidt, Yeshitla M., Yitbarek W. (CSCHM). Paratypes : 39 males, 54 females, same data as holotype (CAF, CSCHM, NHMAA); 2 males, Mt. Choke, crater valley, alt. 3700-3800 m, 10°41'14"N , 37°50'07"E , 24.II.2019, leg. D. Hauth, J. Schmidt, Yeshitla M., Yitbarek W. (CSCHM); 6 males, 7 females, Mt. Choke, western crater valley, alt. 3500-3600 m, 10°41'00"N , 37°50'35"E , 01.V.2022, leg. J. Schmidt, Yeshitla M., (CSCHM). Additional material. 3 males , 3 females , W-slope Mt. Choke , alt. 3370 m , 10°38'07"N , 37°45'51"E , 23.II.2019 , leg. D. Hauth , J. Schmidt , Yeshitla M. , Yitbarek W. (CAF, CSCHM) ; 6 males , 7 females , W-slope Mt. Choke , alt. 3700-3900 m , 10°42'17"N , 37°50'29"E , 25.II.2019 , leg. D. Hauth , J. Schmidt , Yeshitla M. , Yitbarek W. (CAF, CSCHM) ; 43 males , 31 females , W-slope Mt. Choke , "Shoa Kidaneberet" valley, alt. 3700-3800 m , 10°39'08"N , 37°49'45"E , 8.V.2022 , leg. J. Schmidt , Yeshitla M. (CSCHM) ; 10 males , 10 females , N-slope Mt. Choke , alt. 3800-3950 m , 10°43'16"N , 37°51'15"E , 26.II.2019 , leg. D. Hauth , J. Schmidt , Yeshitla M. , Yitbarek W. (CSCHM) ; 18 males , 20 females , N-slope Mt. Choke , alt. 3750-3850 m , 10°43'51"N , 37°52'15"E , 09.V.2022 , leg. J. Schmidt , Yeshitla M. (CSCHM) ; 3 males , 2 females , N-slope Mt. Choke , above Gumadur , alt. 3750-3850 m , 10°44'10"N , 37°53'48"E , 05.V.2022 , leg. J. Schmidt , Yeshitla M. (CSCHM) ; 1 male , N-slope Mt. Choke , N of Waber , alt. 3450-3600 m , 10°44'48"N , 37°46'22"E , 07.V.2022 , leg. J. Schmidt , Yeshitla M. (CSCHM) ; 13 males , 5 females , Mt. Choke , eastern crater valley, alt. 3700-3800 m , 10°42'59"N , 37°54'13"E , 06.V.2022 , leg. J. Schmidt , Yeshitla M. (CSCHM) . Figures 4-7. Baehria separata Schmidt & Faille, gen. nov., sp. nov., dorsal aspect of body ( 4, 6 ) and head ( 5, 7 ) of paratypes ; 4, 5. Male; 6, 7. Female. The small white circles in Figs 5 and 7 mark the insertion points of the clypeal setae. Etymology. The specific epithet refers to the markedly separated distributional area of the taxon, which is, based on current knowledge, far away from its next relatives. It is built by the past participle of the Latin verb separare . Description. See description of genus. Body length : 6.9-7.5 mm ( O = 7.19 mm, n = 20). Proportions (n = 20): PW/HW = 1.18-1.25 ( O = 1.21); PW/PL = 1.30-1.38 ( O = 1.34); PW/PBW = 1.48-1.54 ( O = 1.50); PBW/PAW = 0.92-1.00 ( O = 0.96); EW/PW = 1.42-1.48 ( O = 1.45); EL/EW = 1.46-1.56 ( O = 1.51). Figures 8-15. Baehria separata Schmidt & Faille, gen. nov., sp. nov. 8. Left and right mandible, dorsal aspect; 9. Ventral aspect of head; the small white circles mark the insertion points of the setae on submentum; 10. Right male protarsomeres, left latero-ventral aspect; 11. Left male metatarsomeres, right lateral aspect; 12. Right male protibia, dorsal aspect; 13. Anterior part of elytra and pronotal base; the arrows point to the insertions of the anterior elytral discal setae; 14. Aedeagus, left lateral aspect; 15. Aedeagus, dorsal aspect. Colour : Dark brown to blackish, moderately shiny in both sexes; palpi light brown, labrum and scapus reddish brown, basal 3/4 of femora light brown; antennal base in some specimens more widely brightened. Microsculpture : Same in males and females. Head with deeply engraved, rather large, almost isodiametric sculpticells on disc and supraorbital area, slightly smaller sculpticells on clypeus. Pronotum with moderately deep engraved, slightly transverse sculpticells on disc and markedly deep engraved sculpticells near base; the sculpticells are somewhat smaller than on head disc. Elytral intervals with more finely engraved sculpticells which are more transverse than on pronotum. Aedeagus . Proportion EL/AL (n = 10): 2.40-2.64 ( O = 2.52). Median lobe in lateral view unevenly bent, dorsally with a distinct concavity before middle (Fig. 14 ), in dorsal view not or very slightly broadened before apex (Fig. 15 ). Differential diagnosis. See Diagnosis and Identification sections of the genus, above. Distribution and geographical variability. The type series was collected on the western side of the crater valley of Mt. Choke. Additional populations were collected on the north eastern side of the crater valley and on northern and western slopes of Mt. Choke. Specimens of these populations differ +/- distinctly from those of the type series and from each other by the curvature of the aedeagal median lobe, the number of lightened basal antennomeres, and the depth of the engraving of the elytral microsculpture. Slight differences were also found in the DNA sequence segments of the three investigated specimens representing three different populations (Fig. 2 ; Suppl. material 1). Further morphological and molecular genetic studies are needed to answer the question of whether certain populations represent separate species or subspecies. Habitat. Specimens of Baehria separata gen. nov., sp. nov. have been found in stone packs traversed by running water in small steep streams in the afroalpine zone, together with Dytiscidae beetles (Fig. 16 ). Based on this finding, Baehria separata gen. nov., sp. nov. seems to be adapted to a rheophilic way of life. Trechus Clairville, 1806