Sphaerostoma is a genus of trematodes in the family Opecoelidae. It consists of one species, Sphaerostoma bramae (Müller, 1776).Müller, O. F. (1776). Zoologiæ Danicæ Prodromus, seu Animalium Daniæ et Norvegiæ Indigenarum Characteres, Nomina, et Synonyma Imprimis Popularium. Havniæ: Typis Hallageriis.

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