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протоцефалон n stresses
Gruzovik, entomol.	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)
paleont.	protocephalon
протоцефалоны n
Gruzovik, entomol.	protocephalа (1 the parts of an insect embryo that consist of the prostomium and the first postoral somite; 2 primitive arthropod heads corresponding to the sensory as distinguished from the feeding portion of the head of higher forms)