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PRIMARY SETAE AND PORES ON THE LEGS, THE LAST ABDOMINAL SEGMENT, AND THE UROGOMPHI OF LARVAE OF NEARCTIC COLYMBETINAE (COLEOPTERA: ADEPHAGA: DYTISCIDAE) WITH AN ANALYSIS OF THEIR PHYLOGENETIC RELATIONSHIPS

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

Through an analysis of the primary setae and pores (campaniform sensilla) of first-instar larvae of 32 species of Colymbetinae, 33 species belonging to other dytiscid subfamilies, and seven species belonging to other families of Hydradephaga, the ancestral system of primary setae and pores of the legs, the last abdominal segment, and the urogomphi of Colymbetinae is deduced. Seventy-four setae and 24 pores have been assigned to the generalized colymbetine larva: 51 setae and 18 pores on the legs, 15 setae and three pores on the last abdominal segment, and eight setae and three pores on each urogomphus. A comparison with the ground-plan pattern of the subfamily Hydroporinae is provided. Members of Colymbetinae differ from those of Hydroporinae by the presence of setae TR3, AB14, and AB15, the absence of pore ABd, and the presence of a variable number of additional setae on the femur. A tentative phylogenetic reconstruction of the colymbetine genera provided is based on 24 larval characteristics. The monophyletic origin of the subfamily Colymbetinae is confirmed based on the shared presence of seta AB14. Two monophyletic lineages unite basally: (1) [(Agabus Leach + Ilybius Erichson) + Agabinus Crotch], and (2) {[Colymbetes Clairville + (Rhantus Dejean + Neoscutopterus Balfour-Browne)] + Matus Aubé}. The genera Agabinus and Matus are postulated as a sister-group of (Agabus + Ilybius) and [(Colymbetes + (Rhantus + Neoscutopterus)], respectively. Compared with other Colymbetinae, both Neoscutopterus and Matus stand out by the presence of several strikingly peculiar features. The subgenus Rhantus (Nartus) is postulated to be the sister-group of Neoscutopterus based on the shared presence of additional setae on the dorsal margin of the femur.

Résumé

Sur la base de l’analyse des soies et des pores primaires (sensilles campanoïforme) du premier stade larvaire de 32 espèces de Colymbetinae, de 33 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 des pattes, du dernier segment abdominal et des urogomphes est élaboré. Soixante-quatorze soies et 24 pores ont été incorporés dans le système ancestral de la larve de Colymbetinae : 51 soies et 18 pores sur les pattes, 15 soies et trois pores sur le dernier segment abdominal et huit soies et trois pores sur l’urogomphe. Une comparaison avec le système ancestral des Hydroporinae est réalisée. Les Colymbetinae se distinguent des Hydroporinae par la présence des soies TR3, AB14, et AB15, par l’absence du pore ABd et par la présence d’un nombre variable de soies additionnelles sur le fémur. Une phylogénie des genres de Colymbetinae est proposée à partir de l’analyse de 24 caractères larvaires. L’origine monophylétique de la sous-famille des Colymbetinae est supportée par la présence généralisée de la soie AB14. Deux ensembles monophylétiques divergent à la base du cladogramme : (1) [(Agabus Leach + Ilybius Erichson) + Agabinus Crotch], et (2) {[Colymbetes Clairville + (Rhantus Dejean + Neoscutopterus Balfour-Browne)] + Matus Aube}. Les genres Agabinus et Matus sont respectivement proposés comme groupe consoeur de (Agabus + Ilybius) et [(Colymbetes + (Rhantus + Neoscutopterus)]. Parmi les Colymbetinae étudiés, les genres Neoscutopterus et Matus se distinguent par de nombreuses caractéristiques uniques. Finalement, le sous-genre Rhantus (Nartus) est proposé comme groupe-consoeur de Neoscutopterus. Ces deux lignées se distinguent par la présence de soies additionnelles sur la marge dorsale du fémur.

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 6 , December 1995 , pp. 913 - 943
Copyright
Copyright © Entomological Society of Canada 1995

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