Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis

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The three larval instars of Megadytes (M.) carcharias Griffini and M. (Trifurcitus) fallax (Aubé) are described and illustrated in detail for the first time, with an emphasis on morphometry and chaetotaxy of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. The groun...

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Autor principal: Michat, M.C.
Formato: Artículo publishedVersion
Publicado: 2010
Materias:
Chaetotaxy
Cybistrini
Diving beetles
Dytiscidae
Ground plan
Larva
Megadytes
Phylogenetic relationships
Trifurcitus
beetle
cladistics
larva
morphometry
phylogenetics
Carcharias
Coleoptera
Dytiscinae
Fallax
Hydroporinae
Hygrobiidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_12105759_v107_n3_p377_Michat
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_12105759_v107_n3_p377_Michat_oai
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Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
id I28-R145-paper_12105759_v107_n3_p377_Michat_oai
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spelling I28-R145-paper_12105759_v107_n3_p377_Michat_oai2024-08-16 Michat, M.C. 2010 The three larval instars of Megadytes (M.) carcharias Griffini and M. (Trifurcitus) fallax (Aubé) are described and illustrated in detail for the first time, with an emphasis on morphometry and chaetotaxy of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. The ground plan of chaetotaxy of the genus Megadytes Sharp is described and illustrated based on three of the four recognised subgenera. First-instar larvae of Megadytes are characterised by the presence of a large number of additional sensilla on almost every part of the body. Primary chaetotaxy of the subgenera (Bifurcitus Brinck based on third instar) is very similar, with few differences including (1) shape of the setae on the anterior margin of the frontoclypeus; (2) presence or absence of a ring of multi-branched setae on distal third of mandible; and (3) number of setae on the urogomphus. A cladistic analysis of Dytiscidae, based on 169 larval characters and 34 taxa, indicates that: (1) Trifurcitus Brinck deserves generic status; (2) Cybistrini are not closely related to Hydroporinae; (3) the absence of a galea in Cybistrini is a secondary loss independent of that in Hydroporinae; (4) Cybistrini are well supported by many characters (including several aspects of first-instar chaetotaxy). © 2003 Institute of Entomology. Fil:Michat, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_12105759_v107_n3_p377_Michat info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Eur. J. Entomol. 2010;107(3):377-392 Chaetotaxy Cybistrini Diving beetles Dytiscidae Ground plan Larva Megadytes Phylogenetic relationships Trifurcitus beetle cladistics larva morphometry phylogenetics Carcharias Coleoptera Cybistrini Dytiscidae Dytiscinae Fallax Hydroporinae Hygrobiidae Megadytes Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_12105759_v107_n3_p377_Michat_oai
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-145
collection Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic Chaetotaxy
Cybistrini
Diving beetles
Dytiscidae
Ground plan
Larva
Megadytes
Phylogenetic relationships
Trifurcitus
beetle
cladistics
larva
morphometry
phylogenetics
Carcharias
Coleoptera
Cybistrini
Dytiscidae
Dytiscinae
Fallax
Hydroporinae
Hygrobiidae
Megadytes
spellingShingle Chaetotaxy
Cybistrini
Diving beetles
Dytiscidae
Ground plan
Larva
Megadytes
Phylogenetic relationships
Trifurcitus
beetle
cladistics
larva
morphometry
phylogenetics
Carcharias
Coleoptera
Cybistrini
Dytiscidae
Dytiscinae
Fallax
Hydroporinae
Hygrobiidae
Megadytes
Michat, M.C.
Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis
topic_facet Chaetotaxy
Cybistrini
Diving beetles
Dytiscidae
Ground plan
Larva
Megadytes
Phylogenetic relationships
Trifurcitus
beetle
cladistics
larva
morphometry
phylogenetics
Carcharias
Coleoptera
Cybistrini
Dytiscidae
Dytiscinae
Fallax
Hydroporinae
Hygrobiidae
Megadytes
description The three larval instars of Megadytes (M.) carcharias Griffini and M. (Trifurcitus) fallax (Aubé) are described and illustrated in detail for the first time, with an emphasis on morphometry and chaetotaxy of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. The ground plan of chaetotaxy of the genus Megadytes Sharp is described and illustrated based on three of the four recognised subgenera. First-instar larvae of Megadytes are characterised by the presence of a large number of additional sensilla on almost every part of the body. Primary chaetotaxy of the subgenera (Bifurcitus Brinck based on third instar) is very similar, with few differences including (1) shape of the setae on the anterior margin of the frontoclypeus; (2) presence or absence of a ring of multi-branched setae on distal third of mandible; and (3) number of setae on the urogomphus. A cladistic analysis of Dytiscidae, based on 169 larval characters and 34 taxa, indicates that: (1) Trifurcitus Brinck deserves generic status; (2) Cybistrini are not closely related to Hydroporinae; (3) the absence of a galea in Cybistrini is a secondary loss independent of that in Hydroporinae; (4) Cybistrini are well supported by many characters (including several aspects of first-instar chaetotaxy). © 2003 Institute of Entomology.
format Artículo
Artículo
publishedVersion
author Michat, M.C.
author_facet Michat, M.C.
author_sort Michat, M.C.
title Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis
title_short Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis
title_full Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis
title_fullStr Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis
title_full_unstemmed Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis
title_sort descriptions of larvae of megadytes (coleoptera: dytiscidae: dytiscinae): the subgenera trifurcitus and megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis
publishDate 2010
url http://hdl.handle.net/20.500.12110/paper_12105759_v107_n3_p377_Michat
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_12105759_v107_n3_p377_Michat_oai
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