The unknown larva of the minute diving beetle genus Brachyvatus Zimmermann, 1919 (Coleoptera: Dytiscidae: Bidessini)

The three larval instars of Brachyvatus acuminatus (Steinheil, 1869) (the type species of the bidessine genus Brachyvatus Zimmermann, 1919) are described and illustrated for the first time including detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last a...

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Autores principales: Michat, M.C., Torres, P.L.M.
Formato: JOUR
Materias:
Brachyvatus acuminatus
chaetotaxy
Hydroporinae
larvae
morphometry
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0013872X_v123_n2_p139_Michat
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_0013872X_v123_n2_p139_Michat2023-10-03T14:11:30Z The unknown larva of the minute diving beetle genus Brachyvatus Zimmermann, 1919 (Coleoptera: Dytiscidae: Bidessini) Michat, M.C. Torres, P.L.M. Brachyvatus acuminatus chaetotaxy Hydroporinae larvae morphometry The three larval instars of Brachyvatus acuminatus (Steinheil, 1869) (the type species of the bidessine genus Brachyvatus Zimmermann, 1919) are described and illustrated for the first time including detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. Larvae of this genus are characterized by the absence of the primary pore ABc, which is a synapomorphy of the tribe Bidessini. Brachyvatus larvae can be separated from those of all other known Bidessini genera by the following combination of characters: very small size; lateral branches of nasale well visible in dorsal view; ventroapical spinula on third antennomere absent; meso- and metatergite of instar I with anterotransverse carina; siphon short; long urogomphi with secondary setae; seta PA3 absent; setae UR2 and UR4 inserted contiguously; natatory setae present on tibiae in instars II-III. 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_0013872X_v123_n2_p139_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 Brachyvatus acuminatus
chaetotaxy
Hydroporinae
larvae
morphometry
spellingShingle Brachyvatus acuminatus
chaetotaxy
Hydroporinae
larvae
morphometry
Michat, M.C.
Torres, P.L.M.
The unknown larva of the minute diving beetle genus Brachyvatus Zimmermann, 1919 (Coleoptera: Dytiscidae: Bidessini)
topic_facet Brachyvatus acuminatus
chaetotaxy
Hydroporinae
larvae
morphometry
description The three larval instars of Brachyvatus acuminatus (Steinheil, 1869) (the type species of the bidessine genus Brachyvatus Zimmermann, 1919) are described and illustrated for the first time including detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. Larvae of this genus are characterized by the absence of the primary pore ABc, which is a synapomorphy of the tribe Bidessini. Brachyvatus larvae can be separated from those of all other known Bidessini genera by the following combination of characters: very small size; lateral branches of nasale well visible in dorsal view; ventroapical spinula on third antennomere absent; meso- and metatergite of instar I with anterotransverse carina; siphon short; long urogomphi with secondary setae; seta PA3 absent; setae UR2 and UR4 inserted contiguously; natatory setae present on tibiae in instars II-III.
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 The unknown larva of the minute diving beetle genus Brachyvatus Zimmermann, 1919 (Coleoptera: Dytiscidae: Bidessini)
title_short The unknown larva of the minute diving beetle genus Brachyvatus Zimmermann, 1919 (Coleoptera: Dytiscidae: Bidessini)
title_full The unknown larva of the minute diving beetle genus Brachyvatus Zimmermann, 1919 (Coleoptera: Dytiscidae: Bidessini)
title_fullStr The unknown larva of the minute diving beetle genus Brachyvatus Zimmermann, 1919 (Coleoptera: Dytiscidae: Bidessini)
title_full_unstemmed The unknown larva of the minute diving beetle genus Brachyvatus Zimmermann, 1919 (Coleoptera: Dytiscidae: Bidessini)
title_sort unknown larva of the minute diving beetle genus brachyvatus zimmermann, 1919 (coleoptera: dytiscidae: bidessini)
url http://hdl.handle.net/20.500.12110/paper_0013872X_v123_n2_p139_Michat
work_keys_str_mv AT michatmc theunknownlarvaoftheminutedivingbeetlegenusbrachyvatuszimmermann1919coleopteradytiscidaebidessini
AT torresplm theunknownlarvaoftheminutedivingbeetlegenusbrachyvatuszimmermann1919coleopteradytiscidaebidessini
AT michatmc unknownlarvaoftheminutedivingbeetlegenusbrachyvatuszimmermann1919coleopteradytiscidaebidessini
AT torresplm unknownlarvaoftheminutedivingbeetlegenusbrachyvatuszimmermann1919coleopteradytiscidaebidessini
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