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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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 |
_version_ |
1807323340703006720 |