Crustacea (n.) Look up Crustacea at Dictionary.com
1814, Modern Latin neuter plural of crustaceus (animalia), literally "having a crust or shell," from Latin crusta "crust, rind, bark, hard shell" (see crust (n.); also see -a (2)). Taken as a zoological classification by Lamarck, 1801; Cuvier (1798) had les insectes crustacées.