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Larval morphology of genus Lancetes (Coleoptera: Adephaga: Dytiscidae): the hypothesis of sister-group relationship with the subfamily Dytiscinae revisited

Published online by Cambridge University Press:  31 May 2012

Yves Alarie ,
Miguel Archangelsky ,
Anders N. Nilsson  and
Chris H.S. Watts
Yves Alarie*
Affiliation:
Department of Biology, Laurentian University, Ramsey Lake Road, Sudbury, Ontario, Canada P3E 2C6
Miguel Archangelsky
Affiliation:
Laboratorio de Ecologia Acuatica, Universidad Nacional de La Patagonia, Sarmiento 849, 9200 Esquel, CHUBUT, Argentina
Anders N. Nilsson
Affiliation:
Department of Ecology and Environmental Science, University of Umei, S-901 87 Umei, Sweden
Chris H.S. Watts
Affiliation:
South Australian Museum, North Terrace, Adelaide, SA 5000, Australia
*
1 Corresponding author (e-mail: yalarie@nickel.laurentian.ca).
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Abstract

Descriptions of the larvae of Lancetes angusticollis (Curtis), L. lanceolatus (Clark), L. subseriatus Zimmermann, L. flavoscutatus Enderlein, L. delkeskampi Ríha, and L. nigriceps (Erichson) are provided. Characters from larval morphology are analyzed to infer the phylogenetic relationships of the genus Lancetes Sharp with other genera of Dytiscidae. A parsimony analysis based on 51 informative larval characteristics was conducted with the program NONA. The most parsimonious tree supports a sister-group relationship between the genus Lancetes and members of the subfamily Dytiscinae. The only unambiguous synapomorphy in support of this hypothesis is the secondary subdivision of some cephalic appendages. Other putative synapomorphies are the proximal articulation of the primary seta CO7 both on meso- and meta-coxa and the presence of additional primary setae on the ventral margin of the tibiae. Based on several character states including the presence of multifragmented urogomphi, the genus Lancetes is monophyletic.

Résumé

Les stades larvaires des espèces Lancetes angusticollis (Curtis), L. lanceolatus (Clark), L. subseriatus Zimmermann, L. flavoscutatus Enderlein, L. delkeskampi Ríha, and L. nigriceps (Erichson) sont décrits. Une analyse par parcimonie de 51 caractères larvaires significatifs fut effectuée à l’aide du logiciel NONA afin de déterminer la position phylogénétique du genre Lancetes Sharp parmi les Dytiscidae. L’arbre les plus parcimonieux suggère que le genre Lancetes est le groupe consoeur de la sous-famille Dytiscinae. Cette hypothèse est fortement supportée par la division secondaire de certains articles des appendices céphaliques, caractère pré-sumément synapomorphique, ainsi que par la position proximale de la soie primaire CO7 sur la méso- et la méta-coxa et par la présence de soies primaires additionnelles sur la marge ventrale des tibias. L’origine monophylétique du genre Lancetes est elle-même supportée par plusieurs caractères parmi lesquels la présence d’un urogomphe plurifragmenté.

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 4 , August 2002 , pp. 467 - 501
Copyright
Copyright © Entomological Society of Canada 2002

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