Prouterus see columella

proventricular valvule (ARTHRO: Insecta) In Diptera, a circular fold of the intestinal wall in Tipuloidea.

proventriculus n.; pl. -li [L. pro, before; ventriculus, dim. of venter, belly] An area of the foregut in annelids, insects and crustaceans just anterior to the midgut, and variously modified for grinding or other uses; sometimes called gizzard. proventricular a.

provinculum n. [L. pro, before; vinculum, a binding] (MOLL: Bivalvia) A primitive hinge consisting of very small teeth that develop before the permanent teeth are formed.

provisional mandibles (ARTHRO: Insecta) In some Coleoptera, parts of the mandible found in the pupa, for escaping the cocoon; imaginal cephalic cocoon-cutters.

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