Trigonostoma

Trigonostoma is a genus of sea snails, marine gastropod mollusks in the family Cancellariidae, the nutmeg snails.

Trigonostoma is also the name given to a trematode genus in the family Aspidogastridae, that is actually a synonym of the genus Multicalyx Faust & Tang, 1936

Species
According to the World Register of Marine Species (WoRMS) the following species with valid names are included within the genus Trigonostoma :
 * † Trigonostoma ampullaceum (Brocchi, 1814)
 * Trigonostoma antiquatum (Hinds, 1843) - antique nutmeg
 * † Trigonostoma barnardi A. W. Janssen, 1984
 * Trigonostoma breve (G.B. Sowerby I, 1832a)
 * Trigonostoma bullatum (G.B. Sowerby I, 1832a) - bubble nutmeg
 * Trigonostoma chui Yen, 1936
 * Trigonostoma diamantinum Garrard, 1975
 * Trigonostoma elegantulum (M. Smith, 1947) little elegant nutmeg
 * † Trigonostoma exampullaceum (Sacco, 1894)
 * † Trigonostoma exgeslini (Sacco, 1894)
 * † Trigonostoma extractrix (Boettger, 1906)
 * Trigonostoma gofasi Verhecken, 2007
 * Trigonostoma goniostoma (G.B. Sowerby I, 1832a) - angle-mouth nutmeg
 * Trigonostoma iota Garrard, 1975
 * Trigonostoma kilburni Petit & Harasewych, 2000
 * Trigonostoma lamberti (Souverbie, 1870 in Souverbie & Montrouzier)
 * Trigonostoma laseroni (Iredale, 1936) - Laseron's nutmeg
 * † Trigonostoma lindeni A. W. Janssen, 1984
 * Trigonostoma milleri (Burch, 1949) - Miller's nutmeg
 * Trigonostoma mozambicense Petit & Harasewych, 2002
 * Trigonostoma nitidum (A. Adams, 1855)
 * † Trigonostoma parvotriangula Sacco, 1894
 * † Trigonostoma protrigonostoma (Sacco, 1894)
 * † Trigonostoma pseudumbilicare Peyrot, 1928
 * Trigonostoma pygmaeum (C.B. Adams, 1852)
 * Trigonostoma rugosum (Lamarck, 1822)
 * Trigonostoma scala (Gmelin, 1791)
 * Trigonostoma scalare (Gmelin, 1791)
 * † Trigonostoma schroeckingeri (R. Hoernes & Auinger, 1890)
 * Trigonostoma semidisjunctum (G.B. Sowerby II, 1849a) - disjunct nutmeg
 * † Trigonostoma subsuturale (d'Orbigny, 1852)
 * Trigonostoma tenerum (Philippi, 1848) - Philippi's nutmeg
 * Trigonostoma tessella Garrard, 1975
 * Trigonostoma thysthlon Petit & Harasewych, 1987
 * Trigonostoma tryblium Bouchet & Petit, 2008
 * Trigonostoma tuberculosum (G.B. Sowerby I, 1832a)
 * † ''Trigonostoma umbilicare' ' (Brocchi, 1814)


 * Subgenus Trigonostoma Blainville, 1825
 * Trigonostoma pellucida - triangular nutmeg


 * Species brought into synonymy:
 * Trigonostoma bicolor (Hinds, 1843) : synonym of Scalptia bicolor (Hinds, 1843)
 * Trigonostoma campbelli Shasky, 1961 accepted as Axelella campbelli (Shasky, 1961)
 * † Trigonostoma christiei Finlay, 1924 accepted as † Scalptia christiei (Finlay, 1924)
 * Trigonostoma costiferum (G.B. Sowerby I, 1832) : synonym of Scalptia costifera (G. B. Sowerby I, 1832)
 * Trigonostoma damasoi T. Cossignani, 2015 accepted as Trigonostoma gofasi Verhecken, 2007
 * Trigonostoma foveolata [sic]: synonym of Scalptia foveolata (G.B. Sowerby II, 1849)
 * Trigonostoma rugosum (Lamarck, 1822) accepted as Bivetopsia rugosa (Lamarck, 1822)
 * Trigonostoma scalariformis (Lamarck, 1822) accepted as Scalptia scalariformis (Lamarck, 1822)
 * Trigonostoma semidisjuncta [sic]: synonym of Trigonostoma semidisjunctum (G.B. Sowerby II, 1849)
 * † Trigonostoma thisbe Olsson, 1964 accepted as † Ventrilia thisbe (Olsson, 1964)
 * † Trigonostoma triumpha Olsson, 1964 accepted as † Ventrilia triumpha (Olsson, 1964)
 * Trigonostoma tuberculosa [sic]: synonym of Trigonostoma tuberculosum (G.B. Sowerby I, 1832)
 * Trigonostoma vinnulum Iredale, 1925 : synonym of Trigonaphera vinnulum (Iredale, 1925) (original combination)
 * † Trigonostoma waikaiaensis Finlay, 1924 accepted as † Scalptia waikaiaensis (Finlay, 1924)