Pleurosternite see laterosternite

pleurosternum n. [Gr. pleuron, side; sternon, chest] (ARTHRO: Insecta) A thoraxic sternal plate that facilitates the limb bases; the coxosternum. pleurosternal a.

pleurostoma n. [Gr. pleuron, side; stoma, mouth] (ARTHRO: Insecta) The region of the subgena above the mandible. pleurostomal a.

pleurostomal suture (ARTHRO: Insecta) The part of the sub-genal sulcus above the mandible.

pleurotergite n. [Gr. pleuron, side; L. tergum, back; Gr. -ites, nature of] (ARTHRO: Insecta) 1. A sclerite containing both pleural and tergal elements. 2. In Diptera, the lateral area of the mesopostnotum, above the metathoracic spiracle; in mosquitoes, divisible into lower and upper pleuotergites, represented by apodemes internally.

pleurothetic a. [Gr. pleuron, side; thatos, placed] (MOLL: Bi-valvia) Resting on its side, especially in regard to oysters.

pleuston n. [Gr. pleustes, sailor] Free-floating macroorgan-isms.

plexus n.; pl. plexuses [L. plexus, a twining] A network of interlaced nerves or blood vessels.

plica n.; pl. -cae [L. plicare, to fold] 1. A bend, fold, wrinkles, crenulations or scallops; annulets. 2. (MOLL: Bivalvia) a. A lamellibranch gill in which the lamella are thrown into vertical folds; the apex is farthest from the interlamellar cavity. b. Fold or costa involving the entire thickness of the shell wall; plication.

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