Diloma is a genus of medium-sized sea snails, marine gastropod mollusks in the family Trochidae, the top snails.Bouchet, P. (2010). Diloma Philippi, 1845. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=391149 on 2011-07-02
There is also a genus Diloma, F.H.Wind & P.Cepek, 1979 a genus of phytoplankton in the class Prymnesiophyceae
Description The solid shell is imperforate and depressed globose. It is slate-colored or black, sometimes (especially if worn) reddish or brownish. The conic spire is short. The apex is acute, usually reddish. The sutures are linear. The five whorls are slightly convex, rapidly increasing and spirally obsoletely striate. The body whorl is usually depressed or subconcave below the suture. The base of the shell is rounded, eroded and iridescent in front of the aperture. The aperture is huge, oblique iridescent. The outer lip is rather thin, not black-margined within; but bordered by a brilliantly iridescent band; The columella is concave, obsoletely subdentate below, very broad and flattened or excavated on the face. It is composed principally of an opaque white layer which also lines the base but does not extend to the edge of the lip. The length of the shell varies between 15 mm and 26 mm. Its diameter varies between 17 mm and 24 mm.Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
Distribution This genus occurs in the Indo-Pacific, including New Zealand, Japan, and other areas.
Species Partial phylogram of the species in the genus Diloma:
Other species in the genus not included in the phylogram include:Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 Diloma aethiops (Gmelin, 1791) Diloma amoenum (A. A. Gould, 1849) Diloma aridum (H. J. Finlay, 1926) Diloma bicanaliculatum (Dunker, 1845) Diloma concameratum (W. Wood, 1828) Diloma coracinum (Troschel, 1851) Diloma durvillaea Spencer, Marshall & Waters, 2009Spencer H. G., Marshall B. A. & Waters J. M. (2009). "Systematics and phylogeny of a new cryptic species of Diloma Philippi (Mollusca: Gastropoda: Trochidae) from a novel habitat, the bull kelp holdfast communities of southern New Zealand". Invertebrate Systematics 23: 19-25. . PDF. Diloma filipino S.-I Huang, I-F. Fu, K.-H. Hu & C.-P. Chen, 2026 Diloma hsiujuae S.-I Huang, I-F. Fu, K.-H. Hu & C.-P. Chen, 2026 Diloma imitationis S.-I Huang, I-F. Fu, K.-H. Hu & C.-P. Chen, 2026 Diloma lepidum (A. A. Gould, 1861) Diloma miocenica S. N. Nielsen, Frassinetti & Bandel, 2004 † Diloma nanum Gould, 1861 Diloma nigerrimum (Gmelin, 1791) Diloma oriens S.-I Huang, I-F. Fu, K.-H. Hu & C.-P. Chen, 2026 Diloma piperinum (R. A. Philippi, 1849) Diloma radula (R. A. Philippi, 1849) Diloma samoaense Schwabe & Barclay, 2003 Diloma subrostratum (J. E. Gray, 1835) Diloma sulci S.-I Huang, I-F. Fu, K.-H. Hu & C.-P. Chen, 2026 Diloma triumtrium S.-I Huang, I-F. Fu, K.-H. Hu & C.-P. Chen, 2026 Diloma yanliaoense S.-I Huang, I-F. Fu, K.-H. Hu & C.-P. Chen, 2026 Diloma zelandicum (Quoy & Gaimard, 1834)
Species brought into synonymy: Diloma arida (H. J. Finlay, 1926): synonym of Diloma aridum (H. J. Finlay, 1926) (incorrect gender agreement of specific epithet) Diloma constellatum Souverbie, 1863: synonym of Austrocochlea constellata (Souverbie, 1863) Diloma gaimardi Hutton: synonym of Diloma aethiops Gmelin, 1791 Diloma impervium (Menke, 1843): synonym of Oxystele impervia (Menke, 1843) Diloma nana A. A. Gould, 1861: synonym of Diloma nanum A. A. Gould, 1861 (incorrect grammatical agreement of specific epithet) Diloma plumbea F. W. Hutton, 1882: synonym of Diloma subrostratum (J. E. Gray, 1835) (junior subjective synonym) Diloma sinense (Gmelin, 1791) :synonym of Oxystele sinensis (Gmelin, 1791) Diloma suavis (Philippi, 1849): synonym of Pictodiloma suavis (Philippi, 1849) Diloma tabulare (Krauss, 1848): synonym of Oxystele tabularis (Krauss, 1848) Diloma tigrinum (Anton, 1838): synonym of Oxystele tigrina (Anton, 1838) Diloma variegatum (Anton, 1838): synonym of Oxystele antoni D. G. Herbert, 2015 Diloma subrostratum novaezelandiae Anton, 1838: synonym of Diloma subrostratum (Gray in Yate, 1835) Diloma (Chlorodiloma) millelineata (Bonnett, 1864): synonym of Chlorodiloma millelineata (Bonnett, 1864) Diloma (Fractarmilla) lenior Finlay, H.J., 1927: synonym of Diloma bicanaliculatum (Dunker, 1844)
References
Williams S.T., Karube S. & Ozawa T. (2008) Molecular systematics of Vetigastropoda: Trochidae, Turbinidae and Trochoidea redefined. Zoologica Scripta 37: 483–506 Huang, S.-I, Fu, I-F., Hu, K.-H. & Chen, C.-P. (2026). Notes on Trochus piperinus R. A. Philippi, 1849 (Trochoidea, Trochidae, Monodontinae). Bulletin of Malacology, Taiwan. 49: 1-32.
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