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PHYLOGENETIC RELATIONSHIPS OF NEARCTIC COLYMBETINAE (COLEOPTERA: ADEPHAGA: DYTISCIDAE) BASED ON CHAETOTAXIC AND POROTAXIC ANALYSIS OF HEAD CAPSULE AND APPENDAGES OF LARVAE

Published online by Cambridge University Press:  31 May 2012

Yves Alarie
Yves Alarie
Affiliation:
Department of Biology, Laurentian University, Ramsey lake Road, Sudbury, Ontario, Canada P3E 2C6
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Abstract

An analysis of the primary setae and pores (campaniform sensilla) of first instars of 32 species of Colymbetinae, 61 species belonging to other dytiscid subfamilies, and seven species belonging to other families of Hydradephaga was performed to deduce the ancestral system of primary setae and pores of the head capsule and head appendages of Colymbetinae. Sixty-one setae and 46 pores have been assigned to the ground-plan pattern of the colymbetine larva, 27 setae and 20 pores on the head capsule and 34 setae and 26 pores on the cephalic appendages. The pattern proposed for the Colymbetinae is remarkably consistent and similar to the condition observed within the Carabidae. However, members of the Colymbetinae differ strongly from those of Hydroporinae which are characterized by several secondary losses. A preliminary phylogenetic reconstruction of the relationships of colymbetine genera studied based on 41 larval features suggests that the Nearctic fauna includes two monophyletic lineages: (1) (Agabus Leach + Ilybius Erichson) + Agabinus Crotch, and (2) {[Colymbetes Clairville + (Rhantus Dejean + Neoscutopterus Balfour-Browne)] + Matus Aubé}.

Résumé

Sur la base de l’analyse des soies et des pores primaires (sensilles campanoïformes) du premier stade larvaire de 32 espèces de Colymbetinae, de 61 espèces appartenant aux autres sous-familles de Dytiscidae et de sept espèces appartenant à diverses familles d’Hydradephaga, le système ancestral des soies et des pores primaires de la capsule et des appendices céphaliques est élaboré. Soixante et une soies et 46 pores ont été incorporés dans le système ancestral de la larve de Colymbetinae : 27 soies et 20 pores sur la capsule céphalique et 34 soies et 26 pores sur les appendices céphaliques. Si le système ancestral proposé pour les Colymbetinae s’est révélé très semblable à celui des Carabidae, il se distingue, par ailleurs, de celui des Hydroporinae qui est caractérisé par plusieurs pertes secondaires. Une phylogénie provisoire des genres de Colymbetinae étudiés est proposée à partir de l’analyse de 41 caractères larvaires. Dans l’état actuelle des connaissances, il est suggéré que les Colymbetinae d’Amérique du Nord forment deux lignées évolutives distinctes : (1) (Agabus Leach + Ilybius Erichson) + Agabinus Crotch, and (2) {[Colymbetes Clairville + (Rhantus Dejean + Neoscutopterus Balfour-Browne)] + Matus Aube}.

Type
Articles
Information
The Canadian Entomologist , Volume 130 , Issue 6 , December 1998 , pp. 803 - 824
Copyright
Copyright © Entomological Society of Canada 1998

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