Gyrodactylidae Cobbold, 1864 is a monophyletic family of hyperviviparous species, with 36 genera and approximately 700 species. Here, we focused on one of these genera - namely Jara & Cone, 1989 - characterizing its morphological variation systematically and testing its phylogenetic position in relation to other genera in the family. We collected and describe two new species of monogenean parasites of infecting Neotropical freshwater catfishes in Mexico. n. sp. infects Guatemalan chulín, in Veracruz, while n. sp. infects filespine chulín, in Oaxaca, Mexico. Sequences of the internal transcribed spacer (ITS rDNA) and 18S rDNA were generated for both species. Phylogenetic hypotheses based on maximum likelihood and Bayesian inference analyses of 18S rDNA indicate that the two new Mexican taxa are closely related to each other, and both appear as sister species to an undescribed but molecularly characterized sp. infecting South American catfish, in Brazil. Our analyses confirm the placement of spp. within the monophyletic family Gyrodactylidae, whose sister clade is the Oogyrodactylidae. Within Gyrodactylidae, spp. form a clade sister to a well-supported clade composed by members of the genera , and
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