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Atlanta gibbosa Souleyet, 1852

This conical spired species is easily distinguished from Atlanta inclinata, A. meteori and A. tokiokai by the broad and triangular shape of the spire. The spire is also less tilted than the other conical spired species and the eyes are much larger.

  • The spire is large, tall and triangular cone shaped. There are 6 whorls in the spire.

  • The spire is only tilted a little relative to the plane of coiling.

  • The shell is very transparent and thin (~2 μm) and has a slightly undulating surface but no ornamentation.

  • Adult specimens may reach up to 4 mm and the keel inserts between the final and penultimate whorls in specimens over 2.5 mm.

  • The eyes are large (~ 0.5 mm).

  • The umbilicus is very wide and deep.

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


Similar species:




Further Reading:


Richter, G. 1974. The heteropods of the Meteor Expedition to the Indian Ocean 1964/65. ‘Meteor’ Forsthungsergebnisse, 17: 55–78.


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.


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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