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The razor clam genus  Novaculina  represents an example of a marine-derived, secondary freshwater group. It was thought to comprise three species:  N. gangetica  (Ganges and smaller basins in Bangladesh and northwestern Myanmar),  N. siamensis  (Bang Pakong and Pasak rivers in Thailand and Mekong River in Vietnam), and  N. chinensis  (lower Yangtze River, China). Here we describe  Novaculina myanmarensis  sp. nov., an additional species from the Ayeyarwady and Salween basins representing a divergent lineage that appears to be sister to  N. gangetica . This new record closes a  Novaculina  range disjunction between northwestern Myanmar and Thailand. The populations of this novel species share a shallow molecular divergence from each other indicating potential dispersal events between the two distant freshwater basins during the Late Pleistocene. Our ancestral area modeling suggests that the MRCA of  Novaculina  crown group was a salt-tolerant freshwater species. The recent  Novaculina  species most likely originated via allopatric speciation. Our findings highlight that generalist estuarine species could have played the role as a source for bivalve expansions into freshwater and that western Indochina is a separate biogeographic subregion, which is clearly distinct from India. A new synonymy is proposed as follows: Pharellinae Stoliczka, 1870 = Novaculininae Ghosh, 1920 syn. nov.

Discovery of Novaculina myanmarensis sp. nov. (Bivalvia: Pharidae: Pharellinae) closes the freshwater razor clams range disjunction in Southeast Asia