protocephalon

noun
pro·​to·​cephalon | \¦prōt(ˌ)ō+\
plural protocephala

Definition of protocephalon 

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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History and Etymology for protocephalon

New Latin, from prot- + cephalon

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