Acar is a genus of small saltwater clams, marine bivalve mollusks in the family Arcidae, the ark clams.
Some authors consider it to be a subgenus of Barbatia.
Species Species in this genus include: Acar abdita P. G. Oliver & Chesney, 1994 Acar agulhasensis (Thiele, 1931) Acar bailyi Bartsch, 1931 Acar botanica (Hedley, 1917) Acar carditaeformis (Dautzenberg & H. Fischer, 1897) Acar clathrata (Defrance, 1816) Acar congenita (E. A. Smith, 1885) Acar decorata (Hayami & Kase, 1993) Acar dubia (Baird, 1873) Acar gradata (Broderip & G. B. Sowerby I, 1829), from California, US Acar lepidoformis Francisco, Barros & S. Lima, 2012 Acar marsupialis P. G. Oliver & Holmes, 2004 Acar naturezae Francisco, Barros & S. Lima, 2012 Acar oliveirae Francisco, Barros & S. Lima, 2012 Acar olivercoseli M. Huber, 2010 Acar petasion (Kilburn, 1983) Acar plicata (Dillwyn, 1817) Acar pusilla (G. B. Sowerby I, 1833) Acar requiescens (Melvill & Standen, 1907) Acar rostae (Berry, 1954) Acar sandersonae Powell, 1933 Acar sociella (Brookes, 1926) Acar squamosa (Lamarck, 1819) Acar transmar Simone, 2009, from Brazil
Although Simone lists another species Acar domingensis, it has been reclassified as Barbatia.
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