Trypaea australiensis (Dana, 1852)
Abundant on intertidal estuarine sand flats throughout the Solitary Islands Marine Park. Common throughout south eastern Australia.
Lives in sand and mudflats, especially in estuaries and bays. Its presence is revealed by holes in the sand in shallow waters.
Popular bait for fisherman, it is caught by the use of yabby or nipper pumps. Female top photograph, note the orange egg mass, male below. Locally abundant in the spring and summer months. Grows to 6cm.