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Larval morphology of four genera of Laccophilinae (Coleoptera: Adephaga: Dytiscidae) with an analysis of their phylogenetic relationships

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image of Insect Systematics & Evolution

Descriptions of the larval instars of four genera (12 species) of the dytiscid subfamily Laccophilinae, Laccophilus Leach, Neptosternus Sharp, Australphilus Watts and Africophilus Guignot, are presented including a detailed chaetotaxic and porotaxic analysis of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. A parsimony analysis, based on the 13 informative larval characteristics was conducted with Hennig86. The genus Africophilus is postulated to represent the sister-group of a clade comprised of Laccophilus + (Neptosternus + Australphilus) which is supported by, (i) primary seta CO7 articulated proximally on all legs, (ii) presence of natatory setae, (iii) metatibia + metatarsus very elongated, and (iv) elongated urogomphi.

Affiliations: 1: Department of Biology, Laurentian University, Ramsey Lake Road, Sudbury, Ontario, Canada, P3E 2C6; 2: A. N. Nilsson, Department of Animal Ecology and Department of Biology, University of UmeÅ, S-901 87 UmeÅ, Sweden; 3: L. Hendrich, Berlin-Forschung, Freie Universität Berlin, Gärtnerstraße 74-100, D-12207, Berlin, Germany; 4: C. H. S. Watts, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia; 5: M. Balke, AG Evolutionsbiologie, Institiit für Zoologie, Freie Universitat Berlin, Königin Luise Straße 1-3, D-14195, Berlin, Germany


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