Phylogenetic relationships and larval morphology of the recently described diving beetle genus Laccomimus (Coleoptera: Dytiscidae: Laccophilinae)

The larvae of the diving beetle genus Laccomimus Toledo & Michat, 2015 (Laccophilinae) are studied for the first time, based on detailed descriptions and illustrations of all instars of L. distinctus Toledo & Michat, 2015, with particular emphasis on morphometry and chaetotaxy. The phylogene...

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Detalles Bibliográficos
Autores principales: Michat, M.C., Toledo, M.
Formato: JOUR
Materias:
Chaetotaxy
Coleoptera
Dytiscidae
Ground plan
Laccomimus
Laccophilini
Larva
Morphometry
Phylogeny
beetle
larval development
morphology
morphometry
phylogenetics
taxonomy
Australphilus
Hygrobiidae
Laccophilinae
Laccophilus
Neptosternus
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_12105759_v112_n4_p831_Michat
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_12105759_v112_n4_p831_Michat
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spelling todo:paper_12105759_v112_n4_p831_Michat2023-10-03T16:09:02Z Phylogenetic relationships and larval morphology of the recently described diving beetle genus Laccomimus (Coleoptera: Dytiscidae: Laccophilinae) Michat, M.C. Toledo, M. Chaetotaxy Coleoptera Dytiscidae Ground plan Laccomimus Laccophilini Larva Morphometry Phylogeny beetle larval development morphology morphometry phylogenetics taxonomy Australphilus Coleoptera Dytiscidae Hygrobiidae Laccophilinae Laccophilini Laccophilus Neptosternus The larvae of the diving beetle genus Laccomimus Toledo & Michat, 2015 (Laccophilinae) are studied for the first time, based on detailed descriptions and illustrations of all instars of L. distinctus Toledo & Michat, 2015, with particular emphasis on morphometry and chaetotaxy. The phylogenetic relationships of this genus within the tribe Laccophilini are analyzed cladistically. Laccomimus is recovered as part of a clade that includes the genera Australphilus Watts, 1978, Neptosternus Sharp, 1882 and Laccophilus Leach, 1815 and is characterized by the presence of natatory setae on the tibia and tarsus, and within this clade it is a sister to the other genera. Third-instar larvae of Laccomimus and Africophilus Guignot, 1948 share the mediodistal insertion of the seta CO7 on the meso- and metacoxa, a short and spine-like seta TI6 on the metatibia, a ventrally sclerotized abdominal segment V and a short urogomphus. These characters are considered plesiomorphic and indicate a basal position of both genera within the Laccophilini. All instars of Laccomimus are characterized by the anterolateral lobes of the frontoclypeus clearly projecting beyond the anterior margin and the last abdominal segment strongly elongated. Diagnostic features of the first instar are: frontoclypeus unmodified posteriorly, lamellae clypeales thin and hair-like, pores ANe, MXb-d-f-i, LAb-c and seta TR3 absent, seta LA3 and an additional dorsal pore present on the prementum, abdominal tergites I-VII with anterior transverse carina, and ventral surface of the abdominal segment VI sclerotized. 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_12105759_v112_n4_p831_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 Chaetotaxy
Coleoptera
Dytiscidae
Ground plan
Laccomimus
Laccophilini
Larva
Morphometry
Phylogeny
beetle
larval development
morphology
morphometry
phylogenetics
taxonomy
Australphilus
Coleoptera
Dytiscidae
Hygrobiidae
Laccophilinae
Laccophilini
Laccophilus
Neptosternus
spellingShingle Chaetotaxy
Coleoptera
Dytiscidae
Ground plan
Laccomimus
Laccophilini
Larva
Morphometry
Phylogeny
beetle
larval development
morphology
morphometry
phylogenetics
taxonomy
Australphilus
Coleoptera
Dytiscidae
Hygrobiidae
Laccophilinae
Laccophilini
Laccophilus
Neptosternus
Michat, M.C.
Toledo, M.
Phylogenetic relationships and larval morphology of the recently described diving beetle genus Laccomimus (Coleoptera: Dytiscidae: Laccophilinae)
topic_facet Chaetotaxy
Coleoptera
Dytiscidae
Ground plan
Laccomimus
Laccophilini
Larva
Morphometry
Phylogeny
beetle
larval development
morphology
morphometry
phylogenetics
taxonomy
Australphilus
Coleoptera
Dytiscidae
Hygrobiidae
Laccophilinae
Laccophilini
Laccophilus
Neptosternus
description The larvae of the diving beetle genus Laccomimus Toledo & Michat, 2015 (Laccophilinae) are studied for the first time, based on detailed descriptions and illustrations of all instars of L. distinctus Toledo & Michat, 2015, with particular emphasis on morphometry and chaetotaxy. The phylogenetic relationships of this genus within the tribe Laccophilini are analyzed cladistically. Laccomimus is recovered as part of a clade that includes the genera Australphilus Watts, 1978, Neptosternus Sharp, 1882 and Laccophilus Leach, 1815 and is characterized by the presence of natatory setae on the tibia and tarsus, and within this clade it is a sister to the other genera. Third-instar larvae of Laccomimus and Africophilus Guignot, 1948 share the mediodistal insertion of the seta CO7 on the meso- and metacoxa, a short and spine-like seta TI6 on the metatibia, a ventrally sclerotized abdominal segment V and a short urogomphus. These characters are considered plesiomorphic and indicate a basal position of both genera within the Laccophilini. All instars of Laccomimus are characterized by the anterolateral lobes of the frontoclypeus clearly projecting beyond the anterior margin and the last abdominal segment strongly elongated. Diagnostic features of the first instar are: frontoclypeus unmodified posteriorly, lamellae clypeales thin and hair-like, pores ANe, MXb-d-f-i, LAb-c and seta TR3 absent, seta LA3 and an additional dorsal pore present on the prementum, abdominal tergites I-VII with anterior transverse carina, and ventral surface of the abdominal segment VI sclerotized.
format JOUR
author Michat, M.C.
Toledo, M.
author_facet Michat, M.C.
Toledo, M.
author_sort Michat, M.C.
title Phylogenetic relationships and larval morphology of the recently described diving beetle genus Laccomimus (Coleoptera: Dytiscidae: Laccophilinae)
title_short Phylogenetic relationships and larval morphology of the recently described diving beetle genus Laccomimus (Coleoptera: Dytiscidae: Laccophilinae)
title_full Phylogenetic relationships and larval morphology of the recently described diving beetle genus Laccomimus (Coleoptera: Dytiscidae: Laccophilinae)
title_fullStr Phylogenetic relationships and larval morphology of the recently described diving beetle genus Laccomimus (Coleoptera: Dytiscidae: Laccophilinae)
title_full_unstemmed Phylogenetic relationships and larval morphology of the recently described diving beetle genus Laccomimus (Coleoptera: Dytiscidae: Laccophilinae)
title_sort phylogenetic relationships and larval morphology of the recently described diving beetle genus laccomimus (coleoptera: dytiscidae: laccophilinae)
url http://hdl.handle.net/20.500.12110/paper_12105759_v112_n4_p831_Michat
work_keys_str_mv AT michatmc phylogeneticrelationshipsandlarvalmorphologyoftherecentlydescribeddivingbeetlegenuslaccomimuscoleopteradytiscidaelaccophilinae
AT toledom phylogeneticrelationshipsandlarvalmorphologyoftherecentlydescribeddivingbeetlegenuslaccomimuscoleopteradytiscidaelaccophilinae
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