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Issue: Vol. 1516 No. 1: 28 Jun. 2007
Type: Articles
Published: 2007-06-28
DOI: 10.11646/zootaxa.1516.1.1
Page range: 1–21
Abstract views: 70
PDF downloaded: 2

Larval morphology of Liodessus Guignot, 1939: generic characteristics,  descriptions of five species and comparisons with other members of the tribe Bidessini (Coleoptera: Dytiscidae: Hydroporinae)

Department of Biology, Laurentian University, Ransey Lake Road, Sudbury, Ontario, Canada
Laboratorio de Entomología, DBBE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Av. Int. Güiraldes s/n, Ciudad Universitaria, 1428 Buenos Aires, Argentina
CONICET-LIESA, Laboratorio de Investigaciones en Ecología y Sistemática Animal, Universidad Nacional de La Patagonia, San Juan Bosco, Sarmineto 849, 9200, Esquel, Chubut, Argentina
Department of Freshwater Invertebrates, Albany Museum, Grahamstown 6139, South Africa; Department of Entomology, Rhodes University, Grahamstown
Coleoptera Bidessini Liodessus larval morphology chaetotaxy

Abstract

The larvae of Liodessus affinis (Say, 1823), L. crotchi Nilsson, 2001, L. flavofasciatus (Steinheil, 1869), L. involucer (Brinck, 1948), and L. patagonicus (Zimmermann, 1923) are described with an emphasis on chaetotaxy of the head capsule, head appendages, legs, last abdominal segment and urogomphi. Larvae of these species are very uniform in terms of larval morphology. Considering all known bidessine larvae, Liodessus Guignot, 1939 is more similar to Hypodessus Guignot 1939, Amarodytes Régimbart, 1900, Anodocheilus Babington, 1841, Glareadessus Wewalka & Biström, 1998, Allodessus Guignot, 1953, and Neoclypeodytes Young, 1967, all these genera sharing a short siphon and an elongate first urogomphomere. Liodessus differs from Hypodessus, Amarodytes and Anodocheilus by absence of the primary pore PAj whereas it shares with Anodocheilus the absence of a ventroapical spinula on the third antennomere.

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