Atlanta brunnea Gray, 1850
As the name suggests, this species is usually an orange-brown or red-brown colour. It is thought to be the most ‘primitive’ species of Atlanta.
Atlanta fusca Souleyet, 1852
The shell spire is tall, triangular conical in shape and heavily ornamented with zig-zag spiral lines.
The spire has 3¾ to 4 whorls
A prominent spiral ridge runs along the outer edge of the whorls in the spire, but stops at the end of the juvenile shell.
There is a single adult whorl that is encircled by a tall, colourless keel. The maximum shell size is ~2 mm.
The spire is always brown and the adult whorl is also sometimes brown.
The aperture is rounded.
Further reading and images:
Seapy, R.R. 2011. Atlantidae. In: Tree of life web project. Available at http://tolweb.org/Atlantidae accessed 1 April 2017.
Seapy, R.R. 1990. The pelagic family Atlantidae (Gastropoda: Heteropoda) from Hawaiian waters: a faunistic survey. Malacologia, 32: 107–130.
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. W. 2016. A review of the ecology, palaeontology and distribution of atlantid heteropods (Caenogastropoda: Pterotracheoidea: Atlantidae). Journal of Molluscan Studies, 1-14.