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A group of small bivalves inhabiting Indian brackish-water estuaries and lagoons (known locally as backwaters), variously assigned to    Corbula   ,    Cuspidaria   , and    Sphenia   , are reviewed and, based on shell characters, shown to be congeneric. Molecular (COI) and morphological data indicate that this group belongs to the family   Myidae  . Furthermore, the combined data suggest that these Indian myids are a sister taxon of the genus    Sphenia   . The Indian material studied herein exhibits a functional morphology typical of infaunal bivalves, whereas typical    Sphenia    are nestling and epibyssate. A new genus,    Indosphenia   , is thus erected for the Indian group and includes five species, one of which is named in this study.Indosphenia   kayalum    Oliver, Hallan &amp; Jayachandran,  gen. et sp. n.  is described from the Cochin Backwater on the western coast of India.    Cuneocorbula   cochinensis    (Preston, 1916) is transferred to    Indosphenia   . Additionally, the west coast taxa    I.   abbreviata    (Preston, 1907),    I.   abbreviata   chilkaensis    (Preston, 1911) and    I.   sowerbyi    (EA Smith, 1893) are recognised herein.    Corbula   alcocki    Preston, 1907,    Corbula   gracilis    Preston, 1907,    Corbula   calcaria    Preston, 1907 and    Corbula   pfefferi    Preston, 1907 are placed in synonymy with    I.   abbreviata   , and    Cuspidaria   annandalei    Preston, 1915 is synonymised with    I.   abbreviata   chilkaensis   .

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Taxonomy of myid bivalves from fragmented brackish-water habitats in India, with a description of a new genus    Indosphenia    (  Myidae  ,   Myoidea  ,   Myidae  )