Entomology definition of Cephalotheca: the united head and thorax of arachnids
and crustacea {Scanner’s note: nowadays this term is used
little if at all. It does not seem ever to have been popular.
Instead the terms cephalothorax or prosoma are widely used.}
: that portion of an obtect pupa covering head and thorax: the
anterior segments of larva that have no obviously separated
head.