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Larval morphology of the tribe Matini (Coleoptera: Dytiscidae, Colymbetinae): descriptions of Batrachomatus daemeli, Matus bicarinatus, and Allomatus nannup and phylogenetic relationships

Published online by Cambridge University Press:  31 May 2012

Yves Alarie ,
Chris H.S. Watts  and
Anders N. Nilsson
Yves Alarie*
Affiliation:
Department of Biology, Laurentian University, Ramsey Lake Road, Sudbury, Ontario, Canada P3E 2C6
Chris H.S. Watts
Affiliation:
South Australian Museum, North Terrace, Adelaide, SA 5000, Australia
Anders N. Nilsson
Affiliation:
Department of Ecology and Environmental Science, University of Umeå, S-901 87 Umeå, Sweden
*
1 Author to whom all correspondence should be addressed (E-mail: [email protected]).
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Abstract

Descriptions are presented of larval instars of three species of the colymbetine tribe Matini Zimmermann (Coleoptera: Dytiscidae), Batrachomatus daemeli (Sharp), Matus bicarinatus (Say), and Allomatus nannup Watts, including a chaetotaxic and porotaxic analysis of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphi. A parsimony analysis based on 32 informative larval characteristics was conducted with the computer program NONA. Members of the Matini are postulated to share a monophyletic origin based on (i) seta TR2 articulated anteroventroproximally on the trochanter; (ii) seta TR5 elongate on the metatrochanter; (iii) seta TA1 elongate and inserted proximally on the tarsus; (iv) antenomere III with a hole-like ventroapical spinula; (v) prementum with the primary setae LA2, LA3, LA4, LA5, and LA8 spine-like and elongate; (vi) presence of secondary setae on the cephalic appendages; and (vii) presence of additional primary setae on the last abdominal segment. A clade Matini + Colymbetini is postulated based on (i) metafemoral seta FE5; (ii) metafemoral seta FE6; (iii) seta TI6 on tibia, all elongate and hair-like; (iv) one-segmented urogomphus; (v) presence of an occipital suture in first instar; (vi) galea elongate; (vii) presence of natatory setae on legs; and (viii) presence of secondary setae on the urogomphus.

Résumé

Les stades larvaires de trois espèces de la tribu Matini Zimmermann (Colymbetinae), Batrachomatus daemeli (Sharp), Matus bicarinatus (Say) et Allomatus nannup Watts, sont décrits en incluant une analyse chétotaxique et porotaxique détaillée de la capsule et des appendices céphaliques, des pattes, du dernier segment abdominal et des urogomphes. Une analyse par parcimonie de 32 caractères larvaires significatifs fut effectuée à l’aide du logiciel NONA. Il est proposé que les genres de la tribu Matini partagent une origine monophylétique tel que suggérées par (i) la position antéroventroproximale de la soie TR2 sur le trochanter; (ii) la forme allongée de la soie TR5 sur le métatrochanter; (iii) la forme allongée et la position proximale de la soie TA1 sure le tarse; (iv) la présence sur l’antennomère III, en position ventroapicale d’une spinule en forme de pore; (v) la forme allongée et épineuse des soies LA2, LA3, LA4, LA5 et LA8 sur le prémentum; (vi) la présence de soies secondaires sur les appendices céphaliques; et (vii) la présence de soies primaires additionnelles sur le dernier segment abdominal. Un ensemble monophylétique Matini + Colymbetini est également postulé en s’appuyant sur l’apparence allongée et effilée des soies (i) FE5, sur le métafémur; (ii) FE6, sur le métafémur; (iii) TI6, sur le tibia; (iv) par la présence d’un urogomphe non segmenté; (v) par la présence d’une carène occipitale chez la larve de premier stade; (vi) par la galéa allongée; (vii) par la présence de soies natatoires sur les pattes; et (viii) par la présence de soies secondaires sur les urogomphes.

Type
Articles
Information
The Canadian Entomologist , Volume 133 , Issue 2 , April 2001 , pp. 165 - 196
Copyright
Copyright © Entomological Society of Canada 2001

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