Cucullaea labiata (Hooded Ark)
CUCULAEIDAE is another family of Ark Shells, alongside the ARCIDAE in the superfamily ARCAEA in the order ARCOIDA.
This bivalve is large, ovate-quadrate, very inflated shell. Numerous fine radial riblets. Strong but thin shell. Brownish but paler towards margins. Inside shell is tends to be purple with white margins.

Photo: Robert Whyte
Cucullaea labiata (Hooded Ark)
Cucullaea labiata range is Australian, Central E coast, Gulf of Carp., Lower E coast, NE coast), New South Wales, Queensland. Found on sandy bottoms.

Photo: Robert Whyte