We describe a new species of Pseudoeurycea from the northernmost high peak of the Sierra de Juárez, Oaxaca, México. This species belongs to the P. juarezi group, a monophyletic assemblage restricted to northern Oaxaca and comprising three species: P. juarezi,…

A new species of Spauligodon collected from Cnemidophorus mexicanus and C. deppii is described in this study. The species is placed in Spauligodon because the caudal alae start at the level of the precloacal papillae and embed the adcloacal papillae.…

Rhabdochona ahuehuellensis n. sp. is described from the Balsas goodeid, Ilyodon whitei. The distinctive characters are cuticular elevations in the middle of the prostom, tricuspid ending of the distal part of the left spicule combined with a scoop shape, and…

Two new species of freshwater crabs of the genus Tehuana from the states of Tabasco and Oaxaca, Mexico, are described, and a new diagnosis for the genus is presented. Tehuana chontalpaensis, new species, was collected in a mountain river in…

A new species of parasitic nematode, Cystoopsis atractostei (Trichinelloidea: Cystoopsidae), is described based on female specimens recovered from the subcutaneous tissue of the tropical gar, Atractosteus tropicus Gill (Lepisosteiformes: Lepisosteidae), from 2 localities (Canal Nueva Esperanza and Canal Tabasquillo) of…

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