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Issue: Vol. 5318 No. 1: 18 Jul. 2023
Type: Article
Published: 2023-07-18
DOI: 10.11646/zootaxa.5318.1.2
Page range: 45-66
Abstract views: 277
PDF downloaded: 24

Larval chaetotaxy and morphometry of Megasternini: Cercyon (Paracercyon) Seidlitz, Cryptopleurum Mulsant and Pelosoma Mulsant (Coleoptera: Hydrophilidae)

Facultad de Ciencias Exactas y Naturales; Departamento de Biodiversidad y Biología Experimental; Universidad de Buenos Aires - Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA); CONICET-UBA; Laboratorio de Entomología; Intendente Güiraldes 2160; C1428EGA; Buenos Aires; Argentina
Laboratorio de Investigaciones en Ecología y Sistemática Animal (LIESA). Centro de Investigaciones Esquel de Montaña y Estepa Patagónica (CIEMEP) (CONICET – UNPSJB); Roca 780; 9200 Esquel; Chubut; Argentina
Coleoptera Sphaeridiinae Megasternini water scavenger beetles head morphology sensilla

Abstract

The chaetotaxy of the head capsule and head appendages of all the larval instars of Cercyon (Paracercyon) analis and the first and third instars of Cryptopleurum minutum and Pelosoma sp. is described and illustrated for the first time. Morphometric characters derived from the head capsule and mouthparts are also included, together with detailed illustrations of all characters. The morphology and chaetotaxy of these larvae are compared to that of other Megasternini with described larvae. The larval morphology of Megasternini has proven to be very similar, however we provided a group of chaetotaxic characters useful to separate genera. Most of the differences were found in the sensilla of the head capsule, maxilla, and labium, both in size and arrangement, while the chaetotaxy of the antennae and mandibles was strongly conserved.

 

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