Smith, 1881 Unio protovittatus Hale & Tindale, 1930 Velesunio balonnensis adjunctus Iredale, 1934 Velesunio balonnensis intricatus Iredale, 1934 Velesunio transitus Iredale, 1943 Velesunio mckeowni Iredale, 1943 Velesunio testatus Iredale, 1943 Velesunio ambiguous Graf & Cummings, 2006 Velesunio ambiguus, the floodplain mussel,[2] or the billabong mussel (South Australia),[3] is a species of freshwater bivalve in the family Hyriidae.

There are four other cryptic species in the genus Velesunio (which all look similar to Velesunio ambiguus) in Australia.

[4] Australia: Queensland, New South Wales, Victoria,[5] and South Australia, where it is known as the billabong mussel.

[5] Velesunio ambiguus serves as a food for Australian Aboriginal people, although its flesh is tough.

[5] This species can also be used in fish ponds to filter microscopic algae out of the water.