Two new Larainae species from Guayana region, Venezuela (Coleoptera: Elmidae)

Abstract

Two new species of the subfamily Larainae (Insecta: Coleoptera: Elmidae), Hexanchorus angeli n. sp. and Hypsilara autanai n. sp., are described from Guyana region in Venezuela. We provide habitus photographs, detail drawings of both male and female genitalia, and description of morphological features important for discrimination of the new species. Molecular differences within genera were measured using 816bp fragment of mtDNA gene for cytochrome oxidase c subunit I. Sequence divergences among species are discussed.

Sensibilidad de Elmidae (Insecta: Coleoptera) a la perturbación del hábitat y la calidad fisicoquímica del agua en ambientes lóticos de los Andes colombianos

“…La predilección de los élmidos por sustrato grueso y microhábitats en piedra es congruente con el registro de la familia en el lecho de los ríos (i.e. Spangler, 1980;Brown, 1991;Spangler & Santiago-Fragoso, 1992;Laššová, Čiampor, & Čiamporová-Zaťovičová, 2014;Shepard & Chaboo, 2015), en donde se ha encontrado que pocos géneros colonizan sustratos finos como arena o lodo (Lozano-Bravo et al, 2018). Según el CCA la disponibilidad de sustratos parece ser más decisiva en el asentamiento de Austrelmis, Hexanchorus, Onychelmis, Pharceonus y Pseudodisersus (Fig.…”

Determining Sexual Dimorphism of Living Aquatic Beetles, Stygoparnus comalensis (Coleoptera: Dryopidae) and Heterelmis comalensis (Coleoptera: Elmidae), Using Internal Abdominal Structures

“…The anterior strut of sternite 8 in elmid species is often sexually dimorphic, with the female strut being much longer than the male (e.g., Čiampor 2001, Yoshitomi and Jeng 2013), and has been used to delineate sex without dissection in other elmid species (Fernandes et al 2010). However, in some species these structures appear to be reduced (Kodada 1992), obliterated (Laššová et al 2014) or well developed and subequal in length between sexes (Kodada and Čiampor 2000). Sternite 8 shows similar sexual dimorphic characters in dryopids as well (Kodada et al 2009, 2013), though these structures are often lacking in species descriptions.…”

“…Females of several species of Vietelmis Delève have a more rounded ventrite 5, lack tooth-like projections, and lack peg-like seta or other projections on the metatibia (Kodada and Čiampor 2000). Females of the elmid, Hexanchorus angeli Lassova, Ciampor and Ciamporová-Zatovicová, have a distinctive distal process of ventrite 3 (Laššová et al 2014). Less often, externally viewable internal characters have been used to distinguish sexes of living elmids (Fernandes et al 2010).…”

Elmis rietscheli Steffan, 1958 (Insecta: Coleoptera: Elmidae) in Croatia: first record and DNA barcoding

“…In taxonomic studies on Elmidae, DNA barcoding has been used mostly for assigning immature developmental stages to adults, or in smaller phylogenetic studies, and, in a few cases, also in detecting undescribed species (Čiampor & Ribera, 2006;Čiamporová-Zatovičová et al, 2007;Čiampor & Čiamporová-Zatovičová, 2008;Čiampor & Kodada, 2010;Hayashi & Sota, 2010;Freitag & Balke, 2011;Curiel & Morrone, 2012;Freitag, 2013;Laššová et al, 2014;Hayashi et al, 2016;Čiampor et al, 2016Freitag & Kodada, 2017). Most of these studies deal with tropical species, while for European Elmidae only a few studies based on DNA data are available (e.g.…”