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Issue: Vol. 5263 No. 3: 6 Apr. 2023
Type: Article
Published: 2023-04-06
DOI: 10.11646/zootaxa.5263.3.1
Page range: 301-334
Abstract views: 276
PDF downloaded: 23

Morphology of the larvae of Sandracottus femoralis Heller, 1934, and S. mixtus (Blanchard, 1843) and phylogenetic comparison with other known Aciliini (Coleoptera: Dytiscidae, Dytiscinae)

School of Natural Sciences; Laurentian University; Ramsey Lake Road; Sudbury; Ontario; CANADA
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
Naturhistorisches Museum Wien; Burgring 7; 1010 Vienna; Austria
Coleoptera Dytiscidae Eretini Aubehydrini Sandracottus larvae morphometry chaetotaxy phylogeny

Abstract

We describe the larvae of the diving-beetle genus Sandracottus Sharp, 1882 based on S. femoralis Heller, 1934 and S. mixtus (Blanchard, 1843). We include detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, terminal abdominal segment and urogomphi in order to discover useful characters for distinguishing Sandracottus larvae from those of other known Aciliini (Coleoptera: Dytiscidae, Dytiscinae). A provisional parsimony analysis based on larval characteristics of seven Aciliini species in four genera (Acilius Leach, 1817, Graphoderus Dejean, 1833, Sandracottus, Thermonectus Dejean, 1833) was conducted using the program TNT. A clade grouping Eretini and Aciliini stands out as the most strongly supported in this analysis. The tribe Aciliini finds itself monophyletic with also very good support. Our analysis, however, failed to depict any clear phylogenetic relationships within the Aciliini although each of the four genera studied emerged from our study as morphologically distinct.

 

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