Diloma nanum is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.Bouchet, P. (2012). Diloma nanum Gould, 1861. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=546861 on 2012-11-23Donald K.M., Kennedy M. & Spencer H.G. (2005) The phylogeny and taxonomy of austral monodontine topshells (Mollusca: Gastropoda: Trochidae), inferred from DNA sequences. Molecular Phylogenetics and Evolution 37: 474-483.
Description The small, solid, brown shell has an oval-round shape with a diameter of 5 mm. It contains four convex, very distinct whorls. The apex is simple. The light-colored base of the shell is rounded and hardly perforated. The umbilicus is rather large and plicate-crenulate. The arcuate columella is denticulate. The inner lip is undulate. The throat is livid.Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
Distribution This marine species occurs off the Ryukyu Islands
References
External links Encyclopedia of Life World Register of Marine Species