presegmental region
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presegmental region — see acron … Dictionary of invertebrate zoology
acron — Anteriormost part of body carrying eyes, not considered to be true cephalic somite. (Syn. ophthalmic somite, presegmental region. (Some authors recognize as protocephalon anterior part of head) [Moore and McCormick, 1969]. Anteriormost part of… … Crustacea glossary
acron — n. [Gr. akros, tip] 1. (ARTHROPODA) The anterior unsegmented, or indistinguishably fused, body segments. adj. In Crustacea, ophthalmic somite; presegmental region. b. In Insecta, the prostomium. 2. (MOLLUSCA) The prostomal region of trochophore… … Dictionary of invertebrate zoology
crustacean — /kru stay sheuhn/, n. 1. any chiefly aquatic arthropod of the class Crustacea, typically having the body covered with a hard shell or crust, including the lobsters, shrimps, crabs, barnacles, and wood lice. adj. 2. belonging or pertaining to the… … Universalium
