One of the lower or outer jaws of arthropods.
The third paired mouth part and fifth cephalic appendage. In the Janiroidea (Asellota: Isopoda), it consists of a basal segment bearing three setose lobes.
(pl., maxillae) Paired, ventral sclerite of the mouthparts that forms the lateral portion of the labiomaxillary complex. [drawing][photo][drawing