Oxygyrus inflatus Benson, 1835
This is the only species in the genus Oxygyrus and is easily distinguished by the spherical shape of the shell and the zig-zag ornamentation. Adult specimens also have an outer shell of flexible conchiolin.
Juvenile shell calcareous and spherical in shape. Whorls are involute (a new whorl envelopes previous whorls).
The juvenile shell is covered with complex zig-zag ridges. The shell is transparent but may be purple-brown coloured.
The adult shell grows over the juvenile shell and is composed of flexible, transparent conchiolin.
The keel is also of conchiolin and is very tall.
The adult shell including keel can reach 14 mm.
Eye type c.
Similar species: None
Seapy, R.R. 2011. Atlantidae. In: Tree of life web project. Available at accessed 1 April 2017.
Seapy, R.R., Lalli, C.M., Wells, F., 2003. Heteropoda from Western Australian waters., in: The Marine Flora and Fauna of Dampier, Western Australia. Western Australian Museum, Perth, pp. 513–546.
Wall-Palmer, D., Burridge, A.K., Goetze, E., Stokvis, F., Janssen, A.W., Mekkes, L., Moreno-Alcántara, M., Bednaršek, N., Schiøtte, T., Vinther Sørensen, M., Smart, C.W., Peijnenburg, K.T.C.A. Biogeography and genetic diversity of the atlantid heteropods. Progress in Oceanography, in press. doi: 10.1016/j.pocean.2017.11.004
Wall-Palmer, D., Metcalfe, B., Leng, M.J., Sloane, H.J., Ganssen, G., Vinayachandran, P.N., Smart, C.W. Vertical distribution and diurnal migration of atlantid heteropods. Marine Ecology Progress Series, 587: 1–15. doi: 10.3354/meps12464.
Wall-Palmer, D., Smart, C.W., Kirby, R., Hart, M.B., Peijnenburg, K.T.C.A., Janssen, A. 2016. A review of the ecology, palaeontology and distribution of atlantid heteropods (Caenogastropoda: Pterotracheoidea: Atlantidae). Journal of Molluscan Studies, 1-14.