A preliminary study on the phylogenetic relationships of Copelatus Erichson (Coleoptera: Dytiscidae: Copelatinae) based on larval chaetotaxy and morphology

The phylogenetic relationships of the diving-beetle (Dytiscidae) subfamily Copelatinae are not well known. Some authors postulated a sister-group relationship between Copelatus Erichson and the remaining Dytiscidae, relying mainly on the absence of a mandibular channel in Copelatus. Other authors su...

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Detalles Bibliográficos
Autores principales: Michat, M.C., Torres, P.L.M.
Formato: JOUR
Materias:
Chaetotaxy
Diving beetles
Larvae
Phylogenetic relationships
Cladistic analysis
Coleoptera
Morphometry
Phylogenetic studies
beetle
larva
morphology
morphometry
phylogenetics
subspecies
taxonomy
Colymbetinae
Copelatinae
Copelatus
Dytiscidae
Dytiscinae
Hygrobiidae
Laccophilinae
Lancetinae
Matinae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00188158_v632_n1_p309_Michat
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00188158_v632_n1_p309_Michat2023-10-03T14:16:03Z A preliminary study on the phylogenetic relationships of Copelatus Erichson (Coleoptera: Dytiscidae: Copelatinae) based on larval chaetotaxy and morphology Michat, M.C. Torres, P.L.M. Chaetotaxy Diving beetles Larvae Phylogenetic relationships Chaetotaxy Cladistic analysis Coleoptera Diving beetles Larvae Morphometry Phylogenetic relationships Phylogenetic studies beetle larva morphology morphometry phylogenetics subspecies taxonomy Coleoptera Colymbetinae Copelatinae Copelatus Dytiscidae Dytiscinae Hygrobiidae Laccophilinae Lancetinae Matinae The phylogenetic relationships of the diving-beetle (Dytiscidae) subfamily Copelatinae are not well known. Some authors postulated a sister-group relationship between Copelatus Erichson and the remaining Dytiscidae, relying mainly on the absence of a mandibular channel in Copelatus. Other authors suggested a more derived position of the genus. Larval characters have been underutilized in phylogenetic studies, mainly because the larvae of many taxa within the family and, in particular, within Copelatinae are unknown. A comprehensive approach aimed to study the phylogenetic placement of a member of this subfamily based on larval characters has not been produced so far. In this study, the phylogenetic relationships of Copelatus are explored based on a cladistic analysis of 24 taxa and 120 chaetotaxic and morphological characters from larvae. For this purpose, larvae of Copelatus longicornis Sharp are described and illustrated in detail for the first time, with particular emphasis on morphometry and chaetotaxy, with the latter being unexplored until now. The results support a derived position of Copelatus within Dytiscidae, with a sister-group relationship between this genus and a clade formed by the subfamilies Lancetinae, Coptotominae, Laccophilinae, Colymbetinae, Matinae, and Dytiscinae, and part of Agabinae. No evidence was found for a sister-group relationship between Copelatus and the remaining Dytiscidae so that the absence of a mandibular channel in this genus is likely a reduction. Copelatus is supported by three apomorphies within Dytiscidae: mandibular channel absent, internal margin of the stipes with three robust spinulae, and seta MX8 inserted subapically on the galea. © Springer Science+Business Media B.V. 2009. Fil:Michat, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Torres, P.L.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00188158_v632_n1_p309_Michat
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Chaetotaxy
Diving beetles
Larvae
Phylogenetic relationships
Chaetotaxy
Cladistic analysis
Coleoptera
Diving beetles
Larvae
Morphometry
Phylogenetic relationships
Phylogenetic studies
beetle
larva
morphology
morphometry
phylogenetics
subspecies
taxonomy
Coleoptera
Colymbetinae
Copelatinae
Copelatus
Dytiscidae
Dytiscinae
Hygrobiidae
Laccophilinae
Lancetinae
Matinae
spellingShingle Chaetotaxy
Diving beetles
Larvae
Phylogenetic relationships
Chaetotaxy
Cladistic analysis
Coleoptera
Diving beetles
Larvae
Morphometry
Phylogenetic relationships
Phylogenetic studies
beetle
larva
morphology
morphometry
phylogenetics
subspecies
taxonomy
Coleoptera
Colymbetinae
Copelatinae
Copelatus
Dytiscidae
Dytiscinae
Hygrobiidae
Laccophilinae
Lancetinae
Matinae
Michat, M.C.
Torres, P.L.M.
A preliminary study on the phylogenetic relationships of Copelatus Erichson (Coleoptera: Dytiscidae: Copelatinae) based on larval chaetotaxy and morphology
topic_facet Chaetotaxy
Diving beetles
Larvae
Phylogenetic relationships
Chaetotaxy
Cladistic analysis
Coleoptera
Diving beetles
Larvae
Morphometry
Phylogenetic relationships
Phylogenetic studies
beetle
larva
morphology
morphometry
phylogenetics
subspecies
taxonomy
Coleoptera
Colymbetinae
Copelatinae
Copelatus
Dytiscidae
Dytiscinae
Hygrobiidae
Laccophilinae
Lancetinae
Matinae
description The phylogenetic relationships of the diving-beetle (Dytiscidae) subfamily Copelatinae are not well known. Some authors postulated a sister-group relationship between Copelatus Erichson and the remaining Dytiscidae, relying mainly on the absence of a mandibular channel in Copelatus. Other authors suggested a more derived position of the genus. Larval characters have been underutilized in phylogenetic studies, mainly because the larvae of many taxa within the family and, in particular, within Copelatinae are unknown. A comprehensive approach aimed to study the phylogenetic placement of a member of this subfamily based on larval characters has not been produced so far. In this study, the phylogenetic relationships of Copelatus are explored based on a cladistic analysis of 24 taxa and 120 chaetotaxic and morphological characters from larvae. For this purpose, larvae of Copelatus longicornis Sharp are described and illustrated in detail for the first time, with particular emphasis on morphometry and chaetotaxy, with the latter being unexplored until now. The results support a derived position of Copelatus within Dytiscidae, with a sister-group relationship between this genus and a clade formed by the subfamilies Lancetinae, Coptotominae, Laccophilinae, Colymbetinae, Matinae, and Dytiscinae, and part of Agabinae. No evidence was found for a sister-group relationship between Copelatus and the remaining Dytiscidae so that the absence of a mandibular channel in this genus is likely a reduction. Copelatus is supported by three apomorphies within Dytiscidae: mandibular channel absent, internal margin of the stipes with three robust spinulae, and seta MX8 inserted subapically on the galea. © Springer Science+Business Media B.V. 2009.
format JOUR
author Michat, M.C.
Torres, P.L.M.
author_facet Michat, M.C.
Torres, P.L.M.
author_sort Michat, M.C.
title A preliminary study on the phylogenetic relationships of Copelatus Erichson (Coleoptera: Dytiscidae: Copelatinae) based on larval chaetotaxy and morphology
title_short A preliminary study on the phylogenetic relationships of Copelatus Erichson (Coleoptera: Dytiscidae: Copelatinae) based on larval chaetotaxy and morphology
title_full A preliminary study on the phylogenetic relationships of Copelatus Erichson (Coleoptera: Dytiscidae: Copelatinae) based on larval chaetotaxy and morphology
title_fullStr A preliminary study on the phylogenetic relationships of Copelatus Erichson (Coleoptera: Dytiscidae: Copelatinae) based on larval chaetotaxy and morphology
title_full_unstemmed A preliminary study on the phylogenetic relationships of Copelatus Erichson (Coleoptera: Dytiscidae: Copelatinae) based on larval chaetotaxy and morphology
title_sort preliminary study on the phylogenetic relationships of copelatus erichson (coleoptera: dytiscidae: copelatinae) based on larval chaetotaxy and morphology
url http://hdl.handle.net/20.500.12110/paper_00188158_v632_n1_p309_Michat
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