Insights on Ethiopian montane ground beetles biodiversity: Taxonomic study of afro-alpine and sub-alpine Trechini  (Coleoptera: Carabidae: Trechinae)

Quéinnec, Éric; Ollivier, Eric; Reeb, Catherine

doi:10.12976/jib/2021.27.1.1

Cited by 3 publications

(11 citation statements)

References 31 publications

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“…Trechus (Abyssinotus) gigas Pawłowski: Merene et al [2], p. 47, partim. Remarks: These authors refer to the same material as Quéinnec et al [4]; see comments above.…”

Section: Introductionmentioning

confidence: 99%

“…All of the species are wingless and endemic to single volcanos, with the exception of T. patrizzii Jeannel, 1960 that occurs on some immediately adjacent mountains in southern Ethiopia [1,2]. The elevational distribution of Trechus reflects the adaptation of this group to colder temperatures, and species are restricted to the Afromontane and Afroalpine belts, with observed occurrences between 1800 and 4300 m above sea level [3,4]. The external morphology of the Ethiopian Trechus species is extremely diverse, and, in this respect, they are unlike Trechus species from any other region of the world [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The elevational distribution of Trechus reflects the adaptation of this group to colder temperatures, and species are restricted to the Afromontane and Afroalpine belts, with observed occurrences between 1800 and 4300 m above sea level [3,4]. The external morphology of the Ethiopian Trechus species is extremely diverse, and, in this respect, they are unlike Trechus species from any other region of the world [4][5][6][7][8][9][10]. Most surprising are the results of a recent molecular phylogenetic study showing that morphologically highly divergent Trechus species, syntopically occurring, e.g., on Mt.…”

Section: Introductionmentioning

confidence: 99%

“…Trechus gigas Pawłowski: Ortuño and Novoa [11], p. 136. Trechus (Abyssinotus) gigas Pawłowski: Quéinnec et al [4], p. 14, partim. Remarks: In addition to the type specimens, Quéinnec et al [4] listed one female specimen "T. gigas" from their sampling point "station VI", which is located near the crater rim on the western side of the volcano.…”

Section: Introductionmentioning

confidence: 99%

“…Type material: Not studied. Identification is based on the original description, including habitus and male genital figures of the holotype specimen [7] as well as of the species' redescription including habitus and male genital figures of paratype specimens published by Quéinnec et al [4].…”

Section: Introductionmentioning

confidence: 99%

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Taxonomy, Distribution and Habitat of the Giant Trechus Beetles Endemic to Mt. Choke, Ethiopia (Coleoptera: Carabidae)

Schmidt,

Merene

2024

Taxonomy

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The Holarctic ground beetle genus Trechus Clairville, 1806, is highly diverse in the Ethiopian highlands, both in terms of species numbers and morphology. Particularly noteworthy are the extraordinarily large species of the subgenus Abyssinotus Quéinnec and Ollivier, 2021, with a body length up to 8.5 mm, that occur on Mt. Choke in northern Ethiopia. Recent, intensive field work on Mt. Choke resulted in a significantly large number of specimens that are the basis for our taxonomic revision of the species related to the giant species, T. dimorphicus Pawłowski, 2001 and T. gigas Pawłowski, 2001. We describe three new species and one new subspecies and discuss a likely interspecific hybrid that combines morphological character states of representatives of the dimorphicus and gigas subgroups of Abyssinotus. An iconography of males and females as well as photographs of the aedeagi of all the considered species are presented. The distributions of the species are detailed and knowledge of the species-specific habitat preferences is summarized. Based on the distributions and habitat specificity, a threat assessment based on the current land use pattern at Mt. Choke is provided.

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“…Trechus (Abyssinotus) gigas Pawłowski: Merene et al [2], p. 47, partim. Remarks: These authors refer to the same material as Quéinnec et al [4]; see comments above.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Taxonomy, Distribution and Habitat of the Giant Trechus Beetles Endemic to Mt. Choke, Ethiopia (Coleoptera: Carabidae)

Schmidt,

Merene

2024

Taxonomy

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Trechus species from Mt. Choke of northern Ethiopia related to T. niloticus (Quéinnec & Ollivier) with notable male genital morphology (Carabidae: Trechini)

SCHMIDT,

MERENE

2024

Zootaxa

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The Choke Mountain in northern Ethiopia is remarkable due to its highly diverse Trechini fauna. Based on numerous specimens recently collected in the high montane and afroalpine zones along different slopes of Mt. Choke we revise the species related to Trechus niloticus (Quéinnec & Ollivier) and T. reebae (Quéinnec & Ollivier). These species are characterized by probable synapomorphies of the male genitalia and thus may form a natural group. Four species will be newly described which all are endemic to certain parts of the volcano: T. apertus sp. n., T. igori sp. n., T. kniphofia sp. n., and T. yitbareki sp. n. From viewpoint of genital morphology, T. apertus sp. n. is particular remarkable due to the fact that the dorsal ostium of the male genital extends basally across three quarter of the basal bulb. A key to the smaller Trechus species with body size up to 4 mm is presented.

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Explosive radiation versus old relicts: The complex history of Ethiopian Trechina, with description of a new genus and a new subgenus (Coleoptera, Carabidae, Trechini)

Faille,

Hofmann,

Merene

et al. 2023

DEZ

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The trechine beetle fauna (Coleoptera, Carabidae) of the Ethiopian Highlands is known to be highly diverse in species, and many species groups were recognized to be characterized by unusual character states of external and genital morphology. Earlier authors described several genera and subgenera of Ethiopian Trechina endemic to certain high mountains of the country. However, the relationships of these species groups and their evolutionary history are unknown so far. Here, we present the first molecular phylogenetic analysis of Ethiopian Trechina, detect several synonymic names under Trechus sensu lato, and introduce two new species groups to the country’s fauna: the monotypic genus Baehria Schmidt & Faille, gen. nov., with the type species B. separatasp. nov. from Mt. Choke in northern Ethiopia, and the Trechus subgenus Abunetrechus Schmidt & Faille, subgen. nov., with the type species T. bipartitus Raffray, 1885; this subgenus includes three species of northern Ethiopia. We show that the composition of the Ethiopian fauna is based on multiple events of immigration, which started simultaneously with or some million years after the Oligocene-Early Miocene orogenic events north and south of the Rift Valley. Our results support the habitat island hypothesis for the evolution of the Ethiopian highland fauna. We found no evidence for an alternative hypothesis assuming a close connection of the Trechina immigration to Ethiopia and Pleistocene cooling. We, thus, conclude that the geomorphological development rather than the climatic changes are the main drivers of the diversification of the high-altitude Trechina fauna in Ethiopia.

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Insights on Ethiopian montane ground beetles biodiversity: Taxonomic study of afro-alpine and sub-alpine Trechini (Coleoptera: Carabidae: Trechinae)

Cited by 3 publications

References 31 publications

Taxonomy, Distribution and Habitat of the Giant Trechus Beetles Endemic to Mt. Choke, Ethiopia (Coleoptera: Carabidae)

Taxonomy, Distribution and Habitat of the Giant Trechus Beetles Endemic to Mt. Choke, Ethiopia (Coleoptera: Carabidae)

Trechus species from Mt. Choke of northern Ethiopia related to T. niloticus (Quéinnec & Ollivier) with notable male genital morphology (Carabidae: Trechini)

Explosive radiation versus old relicts: The complex history of Ethiopian Trechina, with description of a new genus and a new subgenus (Coleoptera, Carabidae, Trechini)

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Insights on Ethiopian montane ground beetles biodiversity: Taxonomic study of afro-alpine and sub-alpine Trechini (Coleoptera: Carabidae: Trechinae)

Cited by 3 publications

References 31 publications

Taxonomy, Distribution and Habitat of the Giant Trechus Beetles Endemic to Mt. Choke, Ethiopia (Coleoptera: Carabidae)

Taxonomy, Distribution and Habitat of the Giant Trechus Beetles Endemic to Mt. Choke, Ethiopia (Coleoptera: Carabidae)

Trechus species from Mt. Choke of northern Ethiopia related to T. niloticus (Quéinnec & Ollivier) with notable male genital morphology (Carabidae: Trechini)

﻿Explosive radiation versus old relicts: The complex history of Ethiopian Trechina, with description of a new genus and a new subgenus (Coleoptera, Carabidae, Trechini)

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Explosive radiation versus old relicts: The complex history of Ethiopian Trechina, with description of a new genus and a new subgenus (Coleoptera, Carabidae, Trechini)