Williamia radiata nutata is a subspecies of small sea snail or saltwater limpet with a lung, a marine pulmonate gastropod mollusc in the family Siphonariidae, the marine pulmonate limpets.
References
- Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979
- Marshall B.A. (1981) The genus Williamia in the western Pacific (Mollusca: Siphonariidae). New Zealand Journal of Zoology 8: 487-492.