[1] This is a large, greenish-grey to off-white species, growing to 60–80 mm.

On the column, there are vertical rows of adhesive bumps (verrucae) that are relatively darker than the rest of the body.

[3] This species can be recognized by gravel, bits of shell or coarse sand that it attaches between its tentacles.

[3] Oulactis muscosa normally lives in rocky areas of the mid to low intertidal zone,[2] in sand which has settled into cracks and crevices.

[2] Oulactis muscosa is not sought after by the pet industry, and is abundant.