Trechus
Creators: name: Schmidt, Joachim
name: Merene, Yeshitla
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Trechus

description: Key to the Trechus species from Mt. Choke with body length up to 4 mm
1 Microphthalmic species with compound eyes about half as long as tempora. Entire body yellowish brown. Male protarsomeres not dilated...................................................................... T. hauthi Schmidt & Faille
- Compound eyes longer than tempora. Body reddish to dark brown. At least basal protarsomere of male dilated........... 2
2 Only the first protarsomere of male dilated................................................................. 3
- Protarsomeres 1 and 2 of male dilated..................................................................... 6
3 Pronotum shape as in Zabrus, with sides not clearly convergent toward base, albeit sinuate, and basolateral angles large, rectangular or slightly acute.................................................. T. lobeliae (Quéinnec & Ollivier)
- Pronotal basolateral angles small, obtuse or rounded, its sides markedly constricted toward base....................... 4
4 Elytra with second discal seta absent............................................. T. amharicus Ortuño & Novoa
- Elytra with second discal seta present..................................................................... 5
5 First protarsomere of male moderately dilated with long apical tooth at the interior margin. Aedeagal median lobe with apical lamella well sclerotized, hook-like bent upwardly.............................. T. afroalpinus (Quéinnec & Ollivier)
- First protarsomere of male very slightly dilated with short apical tooth. Aedeagal median lobe with apical lamella very weakly sclerotized, with tip rounded.............................................. T. abyssinicus (Quéinnec & Ollivier)
6 Dorsal opening of the aedeagal median lobe extends basally across three quarters of the basal bulb..................................................................................................... T. apertus Schmidt sp. n.
- The dorsal opening of the aedeagal median lobe not reaching the basal bulb....................................... 7
7 Two basal protarsomeres of males markedly dilated, with the first tarsomere about two times as broad as the third......... 8
- Two basal protarsomeres of males moderately dilated, with the first tarsomere about 1.5 times as broad as the third....... 10
8 Aedeagal median lobe markedly bent downwardly before apical lamella (Quéinnec et al. 2021, Fig. 26B)........................................................................................ T. niloticus (Quéinnec & Ollivier)
- Ventral margin of aedeagal median lobe straight before apical lamella............................................ 9
9 Aedeagal median lobe proportionally longer (EL/AL <1.9), with ventral margin straight in middle and with apical lamella long........................................................................... T. yitbareki Schmidt sp. n.
- Aedeagal median lobe proportionally shorter (EL/AL> 2.0), with ventral margin concave in middle and with apical lamella short..................................................................... T. reebae (Quéinnec & Ollivier)
10 Sculpticells on disc of elytra somewhat irregularly shaped, almost isodiametric. Apex of the aedeagal median lobe well sclerotized..................................................................... T. kniphofia Schmidt sp. n.
- Sculpticells on disc of elytra transverse. Apex of the aedeagal median lobe very slightly sclerotized....................................................................................................... T. igori Schmidt sp. n.
description: Published as part of Schmidt, Joachim & Merene, Yeshitla, 2024, Trechus species from Mt. Choke of northern Ethiopia related to T. niloticus (Quéinnec & Ollivier) with notable male genital morphology (Carabidae: Trechini), pp. 343-355 in Zootaxa 5492 (3) on page 353, DOI: 10.11646/zootaxa.5492.3.3, http://zenodo.org/record/13234851