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]

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