cf. Photius pi890 Theodoridis, with other references there.
On this headword see generally LSJ s.v.: 'a small crab that lives in the pinna's shell, said to give warning of approaching danger'. (For the pin(n)a, see pi 1608.) Aristotle and others mention the creature; nevertheless, the word's appearance here may be generated by the figurative use of it in Aristophanes, Wasps 1510 (of one of the sons of Carcinus; cf. kappa 396).