The shell of Arca noae grows to about 10 cm (4 in) in length.
It is shortened at the anterior end and elongated posteriorly.
It is irregularly striped in brown and white and has fine sculptured ribs running from the umbones to the margin.
The hinge is long and straight and the shell is attached strongly to the substrate by byssal threads.
There are pallial eyes on the edges of the mantle, especially at the posterior end.
The shell of Arca noae grows to about 10 cm (4 in) in length. It is shortened at the anterior end and elongated posteriorly. It is irregularly striped in brown and white and has fine sculptured ribs running from the umbones to the margin. The hinge is long and straight and the shell is attached strongly to the substrate by byssal threads. There are pallial eyes on the edges of the mantle, especially at the posterior end.
Arca noae