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Phylogenetic relationships, larval morphology, and chaetotaxy of the subfamily Coptotominae (Coleoptera: Dytiscidae)

Published online by Cambridge University Press:  01 May 2013

Mariano C. Michat*
Affiliation:
CONICET, Laboratorio de Entomología, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, C1428EHA, Universidad de Buenos Aires, Argentina
Yves Alarie
Affiliation:
Department of Biology, Laurentian University, Ransey Lake Road, P3E 2C6 Sudbury, Ontario, Canada
*
1Corresponding author (e-mail: marianoide@gmail.com).

Abstract

Larval morphology of the monogeneric subfamily Coptotominae (Coleoptera: Dytiscidae) is described and illustrated in detail, with particular emphasis on morphometry and chaetotaxy. Larvae of Coptotomus Say are unique within Dytiscidae in the presence of tracheal gills on the abdominal segments I–VI, a short bifid horn or nasale in instar I, long spinulae on the urogomphus in instar I, and rows of natatory setae on both the internal and external margins of the urogomphus in instars II and III. A cladistic analysis based on 125 larval characters sampled among representatives of other dytiscid subfamilies supports a sister-group relationship between Coptotominae and Laccophilinae based on the shared absence of setae LA10 and LA12 on the second labial palpomere and of pore ABc on the abdominal segment VIII. The clade Coptotominae + Laccophilinae resolved as sister to Lancetinae, all three subfamilies sharing the presence of an unusually low number of lamellae clypeales in the first instar (a condition called four-peg-pattern), postulated to have evolved secondarily within Dytiscidae.

Résumé

La morphologie larvaire de la sous-famille monogénérique Coptotominae (Coleoptera: Dytiscidae) est décrite et illustrée en détail, en portant une attention particulière à la morphométrie et la chétotaxie. Les larves de Coptotomus Say se distinguent de celles des autres Dytiscidae par la présence de branchies trachéales sur les segments abdominaux I-VI, d'une corne bifide ou nasale ainsi que de spinules allongées sur les urogomphes chez la larve de stade I, et par la présence de soies natatoires sur les marges internes et externes des urogomphes de la larve de stade II et III. Une analyse cladistique effectuée à partir de 125 caractères larvaires répertoriés parmi des représentants des autres sous-familles de Dytiscidae suggère une origine monophylétique des Coptotominae et des Laccophilinae en raison de l'absence chez les larves de ce groupe des soies LA10 et LA12 sur le deuxième article du palpe labial ainsi que du pore ABc sur le segment abdominal VIII. La sous-famille Lancetinae est suggérée à titre de groupe consoeur du groupe monophyletique Coptotominae + Laccophilinae en raison de la présence chez les larves de stade I de ce groupe d'un nombre anormalement faible de ‘lamellae clypeales’ (une condition appelée ‘four-peg-pattern’) ce qui paraît représenter une évolution secondaire chez les Dytiscidae.

Type
Systematics & Morphology
Copyright
Copyright © Entomological Society of Canada 2013 

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Phylogenetic relationships, larval morphology, and chaetotaxy of the subfamily Coptotominae (Coleoptera: Dytiscidae)
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