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Centrorhynchus kuntzi Schmidt and Neiland, 1966, reported here for the first time from the USA, occurred in Bubo virginianus in Florida and Buteo jamaicensis, Buteo lineatus, and Buteo platypterus in Loui- siana. Centrorhynchus kuntzi males, previously undescribed, were 10 to 29 mm long with a large swelling near the anterior end of the trunk. The proboscis, averaging 1.14 mm in length and with a marked swelling near the middle at the level of proboscis receptacle insertion, was armed with 26 to 31 (usually 29) longitudinal rows of 22 to 26 (usually 24) hooks each. The first seven to nine (usually 8) hooks in each row possessed long, simple roots and the following 14 to 18 (usually 16) were rootless spines. Centrorhynchus spinosus (Kaiser, 1893) Van Cleave, 1924, occurred in Melanerpes carolinus in Louisiana and Strix varia in Florida and Louisiana. Cen- trorhynchus spinosus resembles C. kuntzi in the range in number of longitudinal rows of proboscis hooks, although C. kuntzi usually possesses one less row (30 in 9, 29 in d), in the total number of proboscis hooks and spines in each longitudinal row, and in possessing a laterally flattened papilla at the posterior end of females. Centrorhynchus spinosus differs from C. kuntzi in lacking proboscis and trunk inflations, possessing a shorter proboscis, and having more, large, rooted proboscis hooks (usually 9 in 9, 10 in d) and fewer rootless spines (usually 15) in each longitudinal row.

Centrorhynchus kuntzi from the USA with Description of the Male and Redescription of C. spinosus (Acanthocephala: Centrorhynchidae)