 The pale- to dark-green female, with a 15 cm-long, round or sausage-shaped body, lives on the sea-floor at a depth of 10 to 100 metres, concealed by burrowing in gravel or hiding in rock crevasses or burrows abandoned by other animals.It has two anchoring hooks underneath its body and an extensible feeding proboscis up to 10 times its body-length.It is mainly a detritivore, feeding also on small animals.