Centrorhynchus microcephalus (Bravo-Hollis, 1947) Golvan, 1956 (Acanthocephala: Centrorhynchidae) originally was described as Gordiorhynchus microcephalus Bravo-Hollis, 1947 on the basis of 8 worms collected from the small intestine of a single great-tailed grackle (Quiscalus mexicanus) from the state of Puebla, Mexico. Acquisition of 48 specimens collected from the groove-billed ani (Crotophaga sulcirostris) in Tlacotalpan, Veracruz, Mexico permitted a more complete description of the species. Nine of 10 (90%) birds examined were infected with 2–13 individuals of Centrorhynchus microcephalus with a mean intensity of 5.3. Examination of the type material of Centrorhynchus crotophagicola Schmidt and Neiland, 1966 revealed this species, described from groove-billed anis and squirrel cuckoos (Piaya cayana) from Nicaragua, to be conspecific with C. microcephalus; thus, C. crotophagicola is considered a junior synonym of C. microcephalus. Centrorhynchus microcephalus is redescribed on the basis of the type material of G. microcephalus and C. crotophagicola, and the newly acquired specimens from Veracruz. This study constitutes the first report of C. microcephalus since its original description. Additionally, a single immature female of Centrorhynchus kuntzi Schmidt and Neiland, 1966 was collected from one ani, representing a new host record and the first report of C. kuntzi from Mexico.
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