protocephalon
noun
pro·to·cephalon
¦prōt(ˌ)ō+
plural protocephala
1
: the part of an insect embryo that consists of the prostomium and the first postoral somite
2
: the primitive arthropod head corresponding to the sensory as distinguished from the feeding portion of the head of higher forms compare gnathothorax
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Merriam-Webster unabridged
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