Eatoniella fossa is a species of marine gastropod mollusc in the family Eatoniellidae. First described by Winston Ponder in 1965, it is endemic to New Zealand, found in waters off the northeastern coast of the North Island, the Hen and Chicken Islands, ManawatÃÂwhi / Three Kings Islands, and the sea banks that surround ManawatÃÂwhi.
In the original description, Ponder described the species as follows:
E. fossa measures by . It can be distinguished from other members of Eatoniella due to the channel between the aperture and the body whorl. The species is superficially similar in appearance to Anabathron.
The species was first described by Winston Ponder in 1965, who used the name Eatoniella (Dardanula) fossa. The modern formatting of the name without a subgenus, Eatoniella fossa, was established by Hamish Spencer and Richard C. Willan in 1995. The holotype of the species was collected by K. Hipkins on 29 December 1953 at a depth of off the west coast of Stephenson Island in the Whangaroa Harbour, Northland. It is held by the Auckland War Memorial Museum.
The species is endemic to New Zealand, found off the northeastern coast of the North Island, as far east as Hicks Bay, as well as the Hen and Chicken Islands, ManawatÃÂwhi / Three Kings Islands, and the Middlesex and King banks off the coast of ManawatÃÂwhi / Three Kings Islands. The species lives between a depth of below sea level.