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Loxaulus hyalinus  Pujade-Villar &amp; 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.

journal of natural history

Discovery of the male of  Loxaulus hyalinus , and implications for the sympatric species  Loxaulus laeta  (Hymenoptera: Cynipidae: Cynipini): an integrative taxonomical case of species delimitation