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Issue: Vol. 5168 No. 3: 22 Jul. 2022
Type: Article
Published: 2022-07-22
DOI: 10.11646/zootaxa.5168.3.9
Page range: 388-400
Abstract views: 435
PDF downloaded: 23

Larval morphology of the Neotropical diving beetle genus Hemibidessus Zimmermann, 1921 (Coleoptera: Dytiscidae: Bidessini)

University of Buenos Aires, Faculty of Exact and Natural Sciences, Department of Biodiversity and Experimental Biology, Laboratory of Entomology, Buenos Aires, Argentina; CONICET-University of Buenos Aires, Institute of Biodiversity and Experimental and Applied Biology (IBBEA), Buenos Aires, Argentina
Department of Biology, Laurentian University, Ramsey Lake Road, Sudbury, Ontario, CANADA.
Departamento de Biodiversidad y Gestión Ambiental, Facultad de Ciencias Biológicas y Ambientales, Universidad de León, Campus de Vegazana, 24071, León, Spain; Coordenação de Biodiversidade, Programa de Pós-Graduação em Entomologia (PPGEnt), Instituto Nacional de Pesquisas da Amazônia (INPA), Av. André Araújo 2936, CEP 69067-375, Manaus, AM, Brazil
Adephaga Hydroporinae Bidessini immature morphometry chaetotaxy Coleoptera

Abstract

We describe for the first time the larva of the diving-beetle genus Hemibidessus Zimmermann, 1921, based on instars II and III of H. conicus (Zimmermann, 1921). 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 Hemibidessus larvae from those of other known Bidessini. Hemibidessus larvae characteristically have elongate legs armed with natatory setae and elongate urogomphi that bear numerous secondary setae, features commonly associated with an increased swimming ability. These characters are shared with Brachyvatus Zimmermann, 1921, suggesting a close phylogenetic relationship between these two genera. The primary seta UR8 is inserted apically on urogomphomere 2 in Hemibidessus larvae, a feature so far only shared with the mature larva of Yola Gozis, 1886. Other characters that combined with those previously mentioned are useful to distinguish Hemibidessus from other bidessines are the absence of a ventroapical spinula on antennomere 3 and the presence of secondary dorsal setae on protarsus.

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