Plebidonax Deltoides

Plebidonax deltoides, known as pipi in the South-eastern Australian states, and Goolwa cockle in South Australia, is a small, edible saltwater clam or marine bivalve mollusc of the family Donacidae, endemic to Australia. It was previously known as Donax deltoides. Other names for the shellfish are Coorong cockle, ugari and eugarie.

This species should not be confused with another bivalve known as "pipi": Paphies australis, family Mesodesmatidae, endemic to New Zealand.