Parietal wall see parietal region

parieto-basilar muscles (CNID: Anthozoa) Muscles on the column of Actinaria that run obliquely from the outer ends of the mesenteries near the base on to the central parts of the pedal disk; functioning to aid in fastening the animal to the substratum.

parivincular a. [L. par, equal; vinculum, bond] (MOLL: Bival-via) Having a ligament similar to a cylinder split on one side, attached by several edges (nymphae), with one edge to each valve. see opisthodetic, amphidetic.

parocciput n. [Gr. para, beside; L. occiput, back of head] (ARTHRO: Insecta) A thickening of the occiput for articulation of the cervical sclerites.

paronychium n.; pl. -ia [Gr. para, beside; onykos, claw] (ARTHRO: Insecta) A bristle-like appendage on the pulvillus between the tarsal claw.

pars n.; pl. partes [L. pars, part] A part of an organ.

pars ampullaris (ARTHRO: Crustacea) In Malacostraca (Hoplo-carida and Anaspidacea), a bottle-shaped structure at the entrance of the digestive glands into the pyloric chamber of the stomach.

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