The phylogenetic position of Hydrovatus Motschulsky: Evidence from larval morphology of H. caraibus Sharp (Coleoptera: Dytiscidae: Hydroporinae)

The phylogenetic position of Hydrovatus Motschulsky was investigated based on a cladistic analysis of 18 hydroporine taxa and 69 characters from larval morphology. For this purpose, the three larval instars of H. caraibus Sharp were described and illustrated for the first time, emphasizing the morph...

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Autor principal: Michat, M.C.
Formato: JOUR
Materias:
Coleoptera
Dytiscidae
Hydroporinae
Hydroporini
Hydrovatini
Hydrovatus
Hyphydrini
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1399560X_v37_n4_p419_Michat
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_1399560X_v37_n4_p419_Michat2023-10-03T16:12:50Z The phylogenetic position of Hydrovatus Motschulsky: Evidence from larval morphology of H. caraibus Sharp (Coleoptera: Dytiscidae: Hydroporinae) Michat, M.C. Coleoptera Dytiscidae Hydroporinae Hydroporini Hydrovatini Hydrovatus Hyphydrini The phylogenetic position of Hydrovatus Motschulsky was investigated based on a cladistic analysis of 18 hydroporine taxa and 69 characters from larval morphology. For this purpose, the three larval instars of H. caraibus Sharp were described and illustrated for the first time, emphasizing the morphometry and chaetotaxy. The resulting cladogram supported a sister-group relationship of the tribes Hydrovatini and Hyphydrini, based on three unambiguous synapomorphies: the absence of pore ANh, the proximal insertion of seta LA8, and the abdominal segment VI sclerotized ventrally. The strong development of seta AB5 and the absence of pore PAj are other two potential synapomorphies for this clade. The tribe Vatellini was resolved as more closely related to members of Hydroporini than to Hyphydrini. However, the support obtained for this relationship was weak, since no unambiguous synapomorphies were discovered. Larvae of H. caraibus are characteristic within Hydroporinae in the absence of an occipital suture, the presence of a galea (secondarily derived according to this study), and the absence of setae LA3 and UR8 and pores PAm and PAo. First instar larva is also unique in that the egg bursters are basally placed on the frontoclypeus and the claws bear ventral spinulae on basal half. © Insect Systematics & Evolution (Group 2 and 7). JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1399560X_v37_n4_p419_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 Coleoptera
Dytiscidae
Hydroporinae
Hydroporini
Hydrovatini
Hydrovatus
Hyphydrini
spellingShingle Coleoptera
Dytiscidae
Hydroporinae
Hydroporini
Hydrovatini
Hydrovatus
Hyphydrini
Michat, M.C.
The phylogenetic position of Hydrovatus Motschulsky: Evidence from larval morphology of H. caraibus Sharp (Coleoptera: Dytiscidae: Hydroporinae)
topic_facet Coleoptera
Dytiscidae
Hydroporinae
Hydroporini
Hydrovatini
Hydrovatus
Hyphydrini
description The phylogenetic position of Hydrovatus Motschulsky was investigated based on a cladistic analysis of 18 hydroporine taxa and 69 characters from larval morphology. For this purpose, the three larval instars of H. caraibus Sharp were described and illustrated for the first time, emphasizing the morphometry and chaetotaxy. The resulting cladogram supported a sister-group relationship of the tribes Hydrovatini and Hyphydrini, based on three unambiguous synapomorphies: the absence of pore ANh, the proximal insertion of seta LA8, and the abdominal segment VI sclerotized ventrally. The strong development of seta AB5 and the absence of pore PAj are other two potential synapomorphies for this clade. The tribe Vatellini was resolved as more closely related to members of Hydroporini than to Hyphydrini. However, the support obtained for this relationship was weak, since no unambiguous synapomorphies were discovered. Larvae of H. caraibus are characteristic within Hydroporinae in the absence of an occipital suture, the presence of a galea (secondarily derived according to this study), and the absence of setae LA3 and UR8 and pores PAm and PAo. First instar larva is also unique in that the egg bursters are basally placed on the frontoclypeus and the claws bear ventral spinulae on basal half. © Insect Systematics & Evolution (Group 2 and 7).
format JOUR
author Michat, M.C.
author_facet Michat, M.C.
author_sort Michat, M.C.
title The phylogenetic position of Hydrovatus Motschulsky: Evidence from larval morphology of H. caraibus Sharp (Coleoptera: Dytiscidae: Hydroporinae)
title_short The phylogenetic position of Hydrovatus Motschulsky: Evidence from larval morphology of H. caraibus Sharp (Coleoptera: Dytiscidae: Hydroporinae)
title_full The phylogenetic position of Hydrovatus Motschulsky: Evidence from larval morphology of H. caraibus Sharp (Coleoptera: Dytiscidae: Hydroporinae)
title_fullStr The phylogenetic position of Hydrovatus Motschulsky: Evidence from larval morphology of H. caraibus Sharp (Coleoptera: Dytiscidae: Hydroporinae)
title_full_unstemmed The phylogenetic position of Hydrovatus Motschulsky: Evidence from larval morphology of H. caraibus Sharp (Coleoptera: Dytiscidae: Hydroporinae)
title_sort phylogenetic position of hydrovatus motschulsky: evidence from larval morphology of h. caraibus sharp (coleoptera: dytiscidae: hydroporinae)
url http://hdl.handle.net/20.500.12110/paper_1399560X_v37_n4_p419_Michat
work_keys_str_mv AT michatmc thephylogeneticpositionofhydrovatusmotschulskyevidencefromlarvalmorphologyofhcaraibussharpcoleopteradytiscidaehydroporinae
AT michatmc phylogeneticpositionofhydrovatusmotschulskyevidencefromlarvalmorphologyofhcaraibussharpcoleopteradytiscidaehydroporinae
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