Some helminth parasites from Morelet's crocodile, Crocodylus moreletii, from Yucatan, Mexico

An examination of three specimens of the Morelet's crocodile, Crocodylus moreletii Dumeril et Bibron, from the Lagoon of Celestun, Yucatan, Mexico revealed the presence of the following eight helminth species: Acanthostomum americanum (Perez Vigueras, 1956), Pelaezia loossi (Perez Vigueras, 1956), Telorchis sp. juv., Pseudoneodiplostomum groschafti sp, n. (all trematodes), Dujardinascaris helicina (Molin, 1860), Contracaecum sp. Type 2 larvae, Micropleura sp. and Paratrichosoma recurvum (Solger, 1877) (all nematodes). Pseudoneodiplostomum groschafti sp. n. is established by indication based on the description of specimens from Crocodylus rhombifer from Cuba, given by Groschaft and Barus (1970). Acanthostomum acuti Caballero et Brennes, 1959 is considered a synonym of A. americanum. A. americanum and D. helicina are recorded for the first time from Mexico and Micropleura sp. is the first American representative of the genus recorded outside South America. Findings of A. americanum, Telorchis sp., P. groschafti, D. helicina and Micropleura sp. in C, moreletti represent new host records. Some observations on the early development of D. helicina are provided. All species, except for P. recurvum, are briefly described and illustrated and some problems concerning their morphology, taxonomy and geographical distribution are discussed.