Atlanta tokiokai Van der Spoel & Troost, 1972
The shell morphology of this species is very similar to Atlanta inclinata. The main identifying characteristic is differences in the subtle arrangement of tubercules on the spire surface.
Spire large, globose cone shaped and tilted relative to the plane of coiling. The spire has 5½ whorls.
Spire has very subtle ornamentation in the form of numerous, uniform spiral rows of small tubercles. There is also a thin ridge that runs around the outer edge of the whorls. The sutures of the spire are shallow.
The soft tissues vary from white, but are often a tan-deep brown.
The keel is tall and inserts between the final and penultimate whorls. The keel base is orange-brown.
The adult shell grows to 3 mm.
In adult forms, the inner walls of the spire are decalcified and separated only by a flexible membrane.
Eye type b, operculum type c, radula type II.
Richter, G., 1990. Zur Kenntnis der Gattung Atlanta (IV). Die Atlanta inclinata-Gruppe (Prosobranchia: Heteropoda). Archiv für Molluskenkunde 119, 259–275.
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.
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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.