Acar is a genus of small saltwater clams, marine bivalve mollusks in the family Arcidae, the ark clams.

[1] Some authors consider it to be a subgenus of Barbatia.

[2] Species in this genus include: Although Simone lists another species Acar domingensis,[2] it has been reclassified as Barbatia.

[1] This Arcidae-related article is a stub.

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