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Diloma nana
''Diloma nana'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Bouchet, P. (2012). ''Diloma nana'' Gould, 1861. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=546861 on 2012-11-23〕〔Donald 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 ) 〕
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