protostome

Term: protostome (n)

Literally meaning: “mouth first”

Origin: Anc Greek

πρώτος/protos(=first) > πρo/pro-(prefix denoting “in front of”, “towards”, "before")

στόμα/stome(=mouth)

Definition

Protostome ia an invertebrate in which the mouth develops before the anus in the embryonic stage.