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Type: Article
Published: 2022-12-09
Page range: 227-246
Abstract views: 291
PDF downloaded: 105

Larval morphology of the Madagascan endemic diving beetle genus Hovahydrus Biström, 1982 (Coleoptera: Dytiscidae) and phylogenetic comparison with other known Hyphydrini

School of Natural Sciences, Laurentian University, Ramsey Lake Road, Sudbury, Ontario, CANADA.
2University of Buenos Aires, Faculty of Exact and Natural Sciences, Department of Biodiversity and Experimental Biology, Laboratory of Entomology, Buenos Aires, Argentina. 3CONICET-University of Buenos Aires, Institute of Biodiversity and Experimental and Applied Biology (IBBEA), Buenos Aires, Argentina.
4Department of Entomology, Faculty of Sciences, Box 906, Antananarivo University, 101 Antananarivo, Madagascar.
5Department of Zoology, Swedish Museum of Natural History, SE-104 Stockholm, Sweden.
Coleoptera Dytiscidae Hydroporinae Madagascar larvae morphometry chaetotaxy phylogeny

Abstract

We describe for the first time the instar III larva of the diving beetle genus Hovahydrus Biström, 1982, based on H. praetextus (Guignot, 1951) and a new species yet to be described (identified here as Hovahydrus sp. near H. minutissimus (Régimbart, 1903)). We include detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi in order to discover useful characters for distinguishing Hovahydrus larvae from those of other known Hyphydrini (Coleoptera: Dytiscidae, Hydroporinae). A provisional parsimony analysis based on larval characteristics of 11 Hyphydrini species in eight genera was conducted using the program TNT. Larval morphology supports a close relationship between Hovahydrus, Hyphydrus Illiger, 1802, and the endemic South Africa genera Andex Sharp, 1882, Coelhydrus Sharp, 1882, Darwinhydrus Sharp, 1882 and Primospes Sharp, 1882.

 

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