Neotrigonia

Neotrigonia
A whole shell of Neotrigonia margaritacea with the valves separated. The right valve is on the left.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Trigoniida
Family:	Trigoniidae
Subfamily:	Trigoniinae
Genus:	Neotrigonia Cossmann, 1912[1]

Neotrigonia is a genus of living saltwater clams, in the family Trigoniidae, which otherwise consists only of fossil genera. For a long time the entire family was thought to be long extinct, but a living species that is now placed in this genus was discovered in 1802. At that time it was assigned to the fossil genus Trigonia. Currently, according to the World Register of Marine Species, 8 species in this genus are recognized.