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.
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.