One in a series of divisions of body. Head (cephalon) consists of five somites (antennular, antennal, mandibular, maxillular, maxillar somites) excluding acron, thorax of eight somites (thoracomeres), and abdomen of six somites excluding telson. Each somite basically consists of dorsal tergite, ventral sternite, and lateral pleurites.
(M. Stachowitsch, 1992)

Alternative form for somite : segment.