Abstract
ABSTRACT Loxaulus hyalinus Pujade-Villar & Melika, 2014 was originally described as an asexual form but the recent collection of male samples confirms that it is, actually, a sexual form. The male of L. hyalinus is here morphologically described. With L. hyalinus being a sexual form, the reasonable question arises whether it may be the alternate generation of the only other Loxaulus species currently known from Mexico, L. laeta Pujade-Villar, 2014 (asex). An analysis of the phylogenetic relationships between L. hyalinus (sex) and L. laeta (asex) shows an uncorrected genetic distance variation between sympatric and allopatric individuals averaging 6.4% (range 5.9–6.9%) between the two species independently of the sampled locality. Four different species delimitation models – Automatic Barcode Gap Discovery (ABGD), Bayesian implementation of the Poisson tree processes (bPTP), Bayesian Phylogenetics and Phylogeography (BPP), and Bayesian Factor Delimitation (BFD) – support the distinctiveness of the two Loxaulus species.
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