title: Helminths of three species of opossums (Mammalia, Didelphidae) from Mexico.
abstract: From August 2011 to November 2013, 68 opossums (8 Didelphis sp., 40 Didelphisvirginiana, 15 Didelphismarsupialis, and 5 Philanderopossum) were collected in 18 localities from 12 Mexican states. A total of 12,188 helminths representing 21 taxa were identified (6 trematodes, 2 cestodes, 3 acanthocephalans and 10 nematodes). Sixty-six new locality records, 9 new host records, and one species, the trematode Brachylaimadidelphus, is added to the composition of the helminth fauna of the opossums in Mexico. These data, in conjunction with previous records, bring the number of taxa parasitizing the Mexican terrestrial marsupials to 41. Among these species, we recognized a group of helminths typical of didelphids in other parts of the Americas. This group is constituted by the trematode Rhopaliascoronatus, the acanthocephalan Oligacanthorhynchusmicrocephalus and the nematodes Cruziatentaculata, Gnathostomaturgidum, and Turgidaturgida. In general, the helminth fauna of each didelphid species showed a stable taxonomic composition with respect to previously sampled sites. This situation suggests that the rate of accumulation of helminth species in the inventory of these 3 species of terrestrial marsupials in the Neotropical portion of Mexico is decreasing; however, new samplings in the Nearctic portion of this country will probably increase the richness of the helminthological inventory of this group of mammals.
authors.affiliation: Departamento de Biología Evolutiva, Facultad de Ciencias, Universidad Nacional Autónoma de México, C.P.04510, Mexico City, Mexico.
authors.forename: Karla
authors.initials: K
authors.lastname: Acosta-Virgen
authors.affiliation: Colección Nacional de Helmintos, Instituto de Biología, Universidad Nacional Autónoma de México, CP 04510, Mexico City, Mexico ; Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Apartado 70-153, C.P. 04510, Mexico City, Mexico.
authors.forename: Jorge
authors.initials: J
authors.lastname: López-Caballero
authors.affiliation: Colección Nacional de Helmintos, Instituto de Biología, Universidad Nacional Autónoma de México, CP 04510, Mexico City, Mexico.
authors.forename: Luis
authors.initials: L
authors.lastname: García-Prieto
authors.affiliation: Departamento de Biología Evolutiva, Facultad de Ciencias, Universidad Nacional Autónoma de México, C.P.04510, Mexico City, Mexico.
authors.forename: Rosario
authors.initials: R
authors.lastname: Mata-López
keywords: Didelphidae; Didelphismarsupialis; Didelphisvirginiana; Philanderopossum; parasites