Required for the proper melanization and sclerotization of the cuticle. Releases C-terminal Arg and Lys from polypeptides. Optimum pH is 7.0 for carboxypeptidase domain 1, and 5.0-6.0 for domain 2. Embryonic and adult stages. There are 3 carboxypeptidase-like domains. Only the first two domains seem to have kept a catalytic activity. Belongs to the peptidase M14 family. Intron retention.