A new genus and species of pinworm (Nematoda, Oxyuridae) from the gray mouse opossum, Tlacuatzin canescens

Abstract

Tlacuatzoxyuris simpsoni n. gen. n. sp. is described from the cecum of the gray opossum, Tlacuatzin canescens, a species endemic to the deciduous dry forest of Mexico. The digestive tracts of four specimens were examined for parasites; three of these were archived in the American Museum of Natural History and one was a live capture. Relative to the other four monotypic genera of pinworms known to infect opossums, the new genus is diagnosed on the basis of a round cephalic plate with a semicircular stoma surrounded by a rim. In addition, males feature a prominent cephalic vesicle not fully developed in females, accounting for sexual dimorphism. The new species includes small worms that feature a conspicuous, not reticulated cephalic vesicle and semicircular stoma and lateral alae with two crests. In addition, the postcloacal cuticle of males features a small area with ornamentation between cloaca and submedial papillae. Finally, both spicule and gubernaculum are relatively short. Although the eggs of Tlacuatzoxyuris n. gen. are unknown, the conspicuous differences in traits used in the diagnosis of genera prompted us to propose a new genus for the new species. This is the first species of Oxyuridae reported in mouse opossums outside South America, and the fifth species of the family occurring in didelphimorph marsupials. This is an example of the usefulness of documenting the diversity of parasites associated with this unique clade of mammals through the examination of preserved tissues.

Importancia del Parque Estatal Cerro de la Tortuga para la conservación de los mamíferos del estado de Morelos, México

“…También se registró al tlacuache ratón (T. canescens), un marsupial arborícola poco abundante en la región, con poca información sobre su distribución en Morelos. Los registros de la especie en el estado son escasos y se restringen a la RBSH (Sánchez-Hernández y Romero- Almaraz, 1995;Jiménez et al, 2019) y a la comunidad de El Paredón, en el municipio de Miacatlán (Altamiron-Álvarez et al, 2009). El PECT se ubica entre estas dos localidades, por lo que su presencia en el área podría indicar una distribución continua de T. canescens al sur RELE PECT RESM CBC RBSH S = 10.028 * A 0.183 R 2 = 0.923 0 1.000 2.000 3.000 4.000 5.000 6.000 Área (ha) Número de especies 70 60 50 40 30 Tabla 2.…”