In the present work, a total of 339 nominal taxa of helminths (53 trematodes, 46 cestodes, 12 acanthocephalans, 227 nem-atodes, and 1 hirudinean), associated with 136 taxa of wild mammals from Mexico, are listed. Information on hosts, hab-itat, distribution, and records is included; these data come from 242 localities, pertaining to 31 of the 32 Mexican states,and represent the current knowledge on helminth parasites of wild mammals in Mexico. Eighteen taxa of helminths are registered for the first time in Mexico, and 46 new locality records are presented.

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. 2011. Análisis panbiogeográfico de Vexillata (Nematoda: Ornithostrongylidae) y sus huéspedes (Mammalia: Rodentia). Acta Zool. Mex. (n. s.), 27(1): 25-46. RESUMEN. Se llevó a cabo un análisis panbiogeográfico, a partir de un análisis de parsimonia de endemismos (PAE) de las especies de helmintos parásitos intestinales del género Vexillata (Nematoda: Ornithostrongylidae) y sus especies de huéspedes, mamíferos de las familias Geomyidae y Heteromyidae. Se realizaron dos análisis, el primero empleando solo aquellas especies del género Vexillata con más de dos localidades, y el segundo, analizando todas las localidades de este género de parásito en un solo trazo individual. Se obtuvieron tres trazos generalizados a partir del PAE del primer análisis: costa norte de Venezuela, América Central y Neártico. Solo uno de los trazos fue sustentado por una especie de parásito y su huésped (V. tejerai y Heteromys anomalus). Se propone la existencia de un nodo biogeográfico en Colombia, entre el trazo de la costa norte de Venezuela y el de América Central en el noroeste de Colombia, en los límites con Panamá; y otro en la zona central de México. Estos trazos y nodos coinciden con algunos propuestos por otros autores. En general se observa que estos sistemas pueden ser explicados como tres componentes bióticos. En particular el de América del Sur puede corresponder con aquellas que especiaron por aislamiento (V. scorzai), y especies con distribuciones amplias (V. tejerai), quizá más relacionadas a etapas de movilidad de sus huéspedes (Heteromys). Palabras clave: helmintos parásitos, nemátodos, mamíferos, panbiogeografía, provincias biogeográ-ficas.

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We document parasitation of a wild cougar ( Puma concolor ) by the nematode Lagochilascaris minor in Hidalgo State, Mexico. This finding contributes to our understanding of the epidemiology of this zoonotic agent in Mexico.

Heteromyoxyuris otomii n. sp., which inhabits the intestinal caecum of Perognathus flavus (Heteromyidae), in Zaragoza, Hidalgo, Mexico, is described. This new species differs from the 2 other congeneric species in the morphology and length of lateral alae in males. Heteromyoxyuris deserti has simple lateral alae located at both sides of the body, whereas in the new species, these structures are double at both sides; in contrast, lateral alae of Heteromyoxyuris longejector begin at the posterior half of the body, whereas they arise in the first third in the new species. Heteromyoxyuris longejector was found in 2 new host species, i.e., Perognathus amplus and Chaetodipus hispidus. This record represents the first record for the species in Mexico, increasing its geographic distribution.

Aspiculuris huascaensis n. sp. was found in the intestine of Mus musculus collected from 2 localities in Hidalgo, Mexico, and is described herein. The new species possesses cervical alae abruptly interrupted at mid-length of esophageal bulb form an acute angle, distinguishing it from 5 of the 17 species in the genus. The new species is differentiated from 11 of the remaining species by having cervical alae that form an acute angle and end at mid-length of the esophageal bulb. Aspiculuris huascaensis n. sp. most closely resembles A. tetraptera in the position of the terminal end of the cervical alae. However, the new species can be distinguished from that species by the number of caudal papillae (12 vs. 14), the presence of a sessile precloacal papilla between 2 cuticular folds, and by having a single pedunculate papilla located slightly posterior to the cloaca.

As a part of an ongoing project to inventory the helminth parasites of rodents in Mexico, 85 specimens of 2 families of rodents were collected from the Mexican Plateau: Cricetidae ( Neotoma sp., Neotoma leucodon , Onychomys arenicola , Peromyscus sp., Peromyscus eremicus , and Reithrodontomys sp.) and Heteromyidae ( Chaetodipus sp., Chaetodipus eremicus , Chaetodipus hispidus , Dipodomys merriami , Dipodomys ordii , Dipodomys ornatus, Dipodomys spectabilis , Liomys irroratus , Perognathus sp., and Perognathus flavus ). A total of 13 taxa of helminths were found: Heteromyoxyuris longejector, Heteromyoxyuris otomii, Heteromyoxyuris sp., Onchocercidae gen. sp. 1 and sp. 2, Physalopteridae gen. sp., Protospirura dipodomis, Pterygodermatites dipodomis, Subulura sp., Syphacia sp., Trichuris dipodomis, Vexillata liomyos, and Vexillata armande. The highest species richness was recorded in D. merriami (7 taxa). This study is the first report of nematodes from O. arenicola (Physalopteridae gen. sp.) and C. eremicus (H. longejector) and for V. liomyos from D. merriami . All reports of these species of nematodes represent new collection localities in Mexico.