Larval morphology and phylogenetic relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)

Bunites Spangler has been the only member of the tribe Colymbetini for which the larva has been unknown. The first-instar larva of Bunites distigma (Brullé) is described and figured for the first time. Detailed morphometric and chaetotaxic analyses are provided. A phylogenetic analysis based on 41 f...

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Autor principal: Michat, M.C.
Formato: JOUR
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Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0010065X_v59_n4_p433_Michat
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spelling todo:paper_0010065X_v59_n4_p433_Michat2023-10-03T14:08:54Z Larval morphology and phylogenetic relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini) Michat, M.C. phylogenetics Coleoptera Colymbetinae Colymbetini Distigma Dytiscidae Meladema Neoscutopterus Rhantus Bunites Spangler has been the only member of the tribe Colymbetini for which the larva has been unknown. The first-instar larva of Bunites distigma (Brullé) is described and figured for the first time. Detailed morphometric and chaetotaxic analyses are provided. A phylogenetic analysis based on 41 first-instar larval characters, including members of six genera of Colymbetini, supports the hypothesis of a derived condition of Bunites within this tribe. Monophyly of Bunites + Rhantus Dejean (s. lat.) (minus Rhantus orbignyi Balke) + Neoscutopterus J. Balfour-Browne + Meladema Laporte is suggested by four synapomorphies: an elongate and hair-like seta FE5 on both meso- and metafemur, and the presence of additional anteroventral setae on tibia and tarsus. The clade Bunites + Neoscutopterus + Meladema is supported by three synapomorphies: the presence of additional setae on the frontoclypeus, dorsal surface of parietal, and urogomphi. Six other character states might also support this group. The clade Bunites + Meladema is well supported by four synapomorphies: the presence of additional setae on the lateromedial portion of frontoclypeus, ventral surface of parietal, anterodistal margin of prementum, and anterodorsal surface of tibia. A derived condition of Bunites within the Colymbetini is suggested by two autapomorphies: the presence of one additional seta on the coxa, and additional dorsal pores on the eighth abdominal segment. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0010065X_v59_n4_p433_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 phylogenetics
Coleoptera
Colymbetinae
Colymbetini
Distigma
Dytiscidae
Meladema
Neoscutopterus
Rhantus
spellingShingle phylogenetics
Coleoptera
Colymbetinae
Colymbetini
Distigma
Dytiscidae
Meladema
Neoscutopterus
Rhantus
Michat, M.C.
Larval morphology and phylogenetic relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)
topic_facet phylogenetics
Coleoptera
Colymbetinae
Colymbetini
Distigma
Dytiscidae
Meladema
Neoscutopterus
Rhantus
description Bunites Spangler has been the only member of the tribe Colymbetini for which the larva has been unknown. The first-instar larva of Bunites distigma (Brullé) is described and figured for the first time. Detailed morphometric and chaetotaxic analyses are provided. A phylogenetic analysis based on 41 first-instar larval characters, including members of six genera of Colymbetini, supports the hypothesis of a derived condition of Bunites within this tribe. Monophyly of Bunites + Rhantus Dejean (s. lat.) (minus Rhantus orbignyi Balke) + Neoscutopterus J. Balfour-Browne + Meladema Laporte is suggested by four synapomorphies: an elongate and hair-like seta FE5 on both meso- and metafemur, and the presence of additional anteroventral setae on tibia and tarsus. The clade Bunites + Neoscutopterus + Meladema is supported by three synapomorphies: the presence of additional setae on the frontoclypeus, dorsal surface of parietal, and urogomphi. Six other character states might also support this group. The clade Bunites + Meladema is well supported by four synapomorphies: the presence of additional setae on the lateromedial portion of frontoclypeus, ventral surface of parietal, anterodistal margin of prementum, and anterodorsal surface of tibia. A derived condition of Bunites within the Colymbetini is suggested by two autapomorphies: the presence of one additional seta on the coxa, and additional dorsal pores on the eighth abdominal segment.
format JOUR
author Michat, M.C.
author_facet Michat, M.C.
author_sort Michat, M.C.
title Larval morphology and phylogenetic relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)
title_short Larval morphology and phylogenetic relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)
title_full Larval morphology and phylogenetic relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)
title_fullStr Larval morphology and phylogenetic relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)
title_full_unstemmed Larval morphology and phylogenetic relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)
title_sort larval morphology and phylogenetic relationships of bunites distigma (brullé) (coleoptera: dytiscidae: colymbetinae: colymbetini)
url http://hdl.handle.net/20.500.12110/paper_0010065X_v59_n4_p433_Michat
work_keys_str_mv AT michatmc larvalmorphologyandphylogeneticrelationshipsofbunitesdistigmabrullecoleopteradytiscidaecolymbetinaecolymbetini
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