Length 30 mm, height 20 mm, breadth 12 mm. Shell thin, fragile, oval, moderatery inflated. Beaks at 1/4 anteriorly, prosocline, with a short crack. Anterior margin rostrate and truncated. A weak ridge runs from umbo to anteroventral corner. Ventral to posterior margins gentle. Surface silverly white with distinct growth lines and periostracum. Interior with weak pearly lustre. Spoon-shaped chondrophore presents below umbo, in an acute angle against dorsal margin.
Distribution:
Brazil and Suriname. Slope.
Remarks:
This species somewhat resembles P. fragile, but chondrophore is nearly parallel to the dorsal margin and anterior portion more strongly rostrated in P. compressa.