Genome-wide species delimitation analyses of a silverside fish species complex in central Mexico indicate taxonomic over-splitting

This study, we used phylogenomic, population genomic, coalescent-based species delimitation approaches, in combination with morphologic and ecologic information, to investigate species numbers and boundaries comprising the Chirostoma humboltianum group (Atherinidae), a taxonomically-controversial species complex where previous morphological and mitochondrial studies produced conflicting species delineation scenarios. We generated double-digest RAD pair-ended sequences (PE ddRADseq) for 77 individuals representing the nine nominal species in the group, spanning their distribution range in the central Mexico plateau.