Claws: the claw or hook-like structures at the end of the foot or tarsus.
Cleavage: see segmentation of egg.
Cleft: split: partly divided, longitudinally: in Coleopteran applied to claws so divided that the parts lie one above the other.
Clintheriform: shaped like a plate. Cloaca: see rectum.
Clubbed: see clavate.
Clypeal suture: marks the division between clypeus and epicranium.
Clypeate: shield-like in form.
Clypeate constriction: applied when a surface is drawn in from the sides so as to produce a shield or saddle-like form.
Clypeo-frontal suture: = clypeal suture.
Clypeus: that portion of the head before or below the front, to which the labrum is attached anteriorly; in Diptera often visible below the margin of the mouth in front, as a more or less visor-shaped piece:= epistoma.