Head region when this includes only somites bearing maxillipeds or gnathopods, or both [Moore and McCormick, 1969].
(Subclass Copepoda):
Head region with one or two fused thoracic somites (Copepoda) [McLaughlin, 1980].
(Subclass Copepoda):
One of three divisions (tagmata) of body (cephalosome, metasome, urosome); consists of head and one or two thoracic somites (thoracomeres) fused to it. Cephalosome and metasome together from prosome. (See also cephalothorax) [Stachowitsch, 1992].
(Subclass Copepoda):
The anterior tagma of the body in copepods, covered by the dorsal cephalic shield and comprising 5 cephalic somites and the first thoracic (maxilliped-bearing) somite [Boxshall and Halsey, 2004].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.