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Atlanta plana Richter, 1972

This species is very similar in size and shape to Atlanta gaudichaudi, but can be distinguished by numerous spiral ridges on the spire.

  • Spire is small and consists of 3½ whorls.

  • The spire is ornamented with two spiral ridges on the second and third whorls, although these can be difficult to see under a light microscope. A thin ridge also runs along the outer edge of the third to fourth whorls.

  • The sutures of the spire are deep so that the whorls can be easily distinguished and have a red-purple colour.

  • The keel is of moderate height and has a red-brown keel base.

  • Eye type a, operculum type b, radula type I.

  • This species has not been found in the Atlantic Ocean.


Similar species:




Further Reading:


Richter, G. 1987. Zur Kenntnis der Gattung Atlanta, 3. Atlanta inflata, A. helicinoides, A. echinogyra und A. plana (Prosobranchia: Heteropoda). Archiv für Molluskenkunde, 117: 177-201.


Seapy, R.R. 1990. The pelagic family Atlantidae (Gastropoda: Heteropoda) from Hawaiian waters: a faunistic survey. Malacologia, 32: 107–130.


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, 160:1–25. 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.


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