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

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)

• Hemmen J. (2007). Recent Cancellariidae.Annotated and illustrated catalogue of Recent Cancellariidae. Privately published, Wiesbaden. 428 pp.
• Bouchet P. & Petit R.E. (2008). New species and new records of southwest Pacific Cancellariidae. The Nautilus 122(1): 1-18.

Wikimedia Commons has media related to Trigonostoma.

• Perry, G. (1811). Conchology, or the natural history of shells: containing a new arrangement of the genera and species, illustrated by coloured engravings executed from the natural specimens, and including the latest discoveries. 4 pp., 61 plates. London
• Blainville, H. M. D. de. (1825-1827). Manuel de malacologie et de conchyliologie. Paris, Levrault 1-647
• Iredale, T. (1936). Australian molluscan notes, no. 2. Records of the Australian Museum. 19(5): 267-340, pls 20-24

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