Trigonostoma
Apertural view of shell of Trigonostoma milleri Burch, 1949
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Family:	Cancellariidae
Genus:	Trigonostoma Blainville, 1825
Type species
Delphinula trigonostoma Lamarck, 1822
Synonyms[1]
Arizelostoma Iredale, 1936 Cancellaria (Trigonostoma) Blainville, 1827 Extractrix Korobkov, 1955 Trigona Perry, 1811 (Invalid: junior homonym of Trigona Jurine, 1807 [Hymenoptera])

Trigonostoma is a genus of sea snails, marine gastropod mollusks in the family Cancellariidae, the nutmeg snails.^[1]

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 :^[1]

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)