Eucyathostomum webbi sp. n. (Strongyloidea: Cloacinidae) from white-tailed deer (Odocoileus virginianus).

The new species is described from white-tailed deer of McIntosh County, Georgia, and Pushmataha County, Oklahoma. Eucyathostomum webbi sp. n. differs from E. longesubulatum (type) in possessing more internal leaf crown elements, unbarbed spiculte tips, variability in the configuration of the dorsal ray of the male bursa, and shorter vagina and ovejectors; from E. copulatum in being much larger and not having males and females permanently united; from E. spinulosum in the origin of the externo-dorsal ray of the male bursa; and from E. dentatum in having more internal leaf crown elements, shorter spicules, a distinct cephalic vesicle, no dorsal gutter, and a pectinated flange posterior to the vulva. Problems in the taxonomy of the genus Eucyathostomum are discussed. Specimens previously identified as E. longesubulatum from southeastern white-tailed deer were reexamined and found to be conspecific with E. webbi.