Larval morphology of Allodessus Guignot (Coleoptera: Dytiscidae)

The three larval instars of the type species of the bidessine genus Allodessus Guignot (A. bistrigatus (Clark)) 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 urogomp...

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Autores principales: Michat, M.C., Alarie, Y., Watts, C.H.S.
Formato: JOUR
Materias:
Bidessini
Chaetotaxy
Diving beetles
Larva
Morphometry
Phylogenetic relationships
Allodessus
Allodessus bistrigatus
Coleoptera
Dytiscidae
Hygrobiidae
Spinula
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01650424_v33_n1_p27_Michat
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01650424_v33_n1_p27_Michat2023-10-03T15:02:44Z Larval morphology of Allodessus Guignot (Coleoptera: Dytiscidae) Michat, M.C. Alarie, Y. Watts, C.H.S. Bidessini Chaetotaxy Diving beetles Larva Morphometry Phylogenetic relationships Allodessus Allodessus bistrigatus Bidessini Coleoptera Dytiscidae Hygrobiidae Spinula The three larval instars of the type species of the bidessine genus Allodessus Guignot (A. bistrigatus (Clark)) 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 characterised by the absence of the primary pore ABc, which is a synapomorphy of the tribe Bidessini, and the presence of secondary setae on the urogomphi, which suggest a close phylogenetic relationship with Amarodytes Régimbart. Allodessus larvae are further characterised by a short last abdominal segment, long urogomphi, absence of colour pattern on the body, presence of a ventroapical spinula on the third antennomere, presence of pore PAk, presence of posterior secondary setae on coxa, presence of a large number of secondary setae on coxa, presence of posteroventral secondary setae on tarsus, and presence of a total of 6-7 (instar II) and 7-11 (instar III) secondary setae on metatarsus. This combination of characters separates larvae of Allodessus from those of the other known Bidessini genera. © 2011 Taylor & Francis. Fil:Michat, M.C. 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_01650424_v33_n1_p27_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 Bidessini
Chaetotaxy
Diving beetles
Larva
Morphometry
Phylogenetic relationships
Allodessus
Allodessus bistrigatus
Bidessini
Coleoptera
Dytiscidae
Hygrobiidae
Spinula
spellingShingle Bidessini
Chaetotaxy
Diving beetles
Larva
Morphometry
Phylogenetic relationships
Allodessus
Allodessus bistrigatus
Bidessini
Coleoptera
Dytiscidae
Hygrobiidae
Spinula
Michat, M.C.
Alarie, Y.
Watts, C.H.S.
Larval morphology of Allodessus Guignot (Coleoptera: Dytiscidae)
topic_facet Bidessini
Chaetotaxy
Diving beetles
Larva
Morphometry
Phylogenetic relationships
Allodessus
Allodessus bistrigatus
Bidessini
Coleoptera
Dytiscidae
Hygrobiidae
Spinula
description The three larval instars of the type species of the bidessine genus Allodessus Guignot (A. bistrigatus (Clark)) 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 characterised by the absence of the primary pore ABc, which is a synapomorphy of the tribe Bidessini, and the presence of secondary setae on the urogomphi, which suggest a close phylogenetic relationship with Amarodytes Régimbart. Allodessus larvae are further characterised by a short last abdominal segment, long urogomphi, absence of colour pattern on the body, presence of a ventroapical spinula on the third antennomere, presence of pore PAk, presence of posterior secondary setae on coxa, presence of a large number of secondary setae on coxa, presence of posteroventral secondary setae on tarsus, and presence of a total of 6-7 (instar II) and 7-11 (instar III) secondary setae on metatarsus. This combination of characters separates larvae of Allodessus from those of the other known Bidessini genera. © 2011 Taylor & Francis.
format JOUR
author Michat, M.C.
Alarie, Y.
Watts, C.H.S.
author_facet Michat, M.C.
Alarie, Y.
Watts, C.H.S.
author_sort Michat, M.C.
title Larval morphology of Allodessus Guignot (Coleoptera: Dytiscidae)
title_short Larval morphology of Allodessus Guignot (Coleoptera: Dytiscidae)
title_full Larval morphology of Allodessus Guignot (Coleoptera: Dytiscidae)
title_fullStr Larval morphology of Allodessus Guignot (Coleoptera: Dytiscidae)
title_full_unstemmed Larval morphology of Allodessus Guignot (Coleoptera: Dytiscidae)
title_sort larval morphology of allodessus guignot (coleoptera: dytiscidae)
url http://hdl.handle.net/20.500.12110/paper_01650424_v33_n1_p27_Michat
work_keys_str_mv AT michatmc larvalmorphologyofallodessusguignotcoleopteradytiscidae
AT alariey larvalmorphologyofallodessusguignotcoleopteradytiscidae
AT wattschs larvalmorphologyofallodessusguignotcoleopteradytiscidae
_version_ 1807316005823709184

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