Solid, oval shell. Has a number of irregular concentric ridges. Has abundant slightly wavy radial grooves crossing the shell. The shell is dirty greyish white to brown. May have rust coloured splotches on the shell. Young specimens are delicately marked with fine chevrons. Internally the shells are shiny greyish to to yellowish white, sometimes with a purple splotch at the posterior end. Up to 60mm shell length.
Common from low intertidal to at least 20m in protected to semi-protected shores, harbours and estuaries, Often in channels. May also occur in seagrass beds.
Filters phytoplankton out of the water.
NZ Coastal Marine Invertebrates; Vol 1.