Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

670Maggenti and GardnerEchinoidea and Asteroidea, stalked pincer-like structures,usually armed with teeth, used for removal of foreign particlesand prevention of larvae of sessile organisms fromsettling on the animal; sessile pedicellariae are composedof two or more short, movable spines on the same or adjacentossicles.pedicellate a. [L. pediculus, little foot] Supported by a pedicelor petiole.pedicellus spines (ARTHRO: Insecta) In Hymenoptera andDiptera, sensory spines at the bases of the antennae thatplay a role in the perception of gravity and possibly currentstimuli.pedicle n. [L. pediculus, little foot] (BRACHIO) A variously developed,tough flexible stalk protruding from the bivalveshell; functioning as a tether, a pivot around which theshell may be moved, or as a locomotory organ.pedicle collar (BRACHIO) The two deltidial plates curvedaround the pedicle base, may or may not be fused.pedicle foramen (BRACHIO) Ring-like perforation of a shellthrough which the pedicle passes.pedicle groove (BRACHIO) When present, subtriangular groovedividing the ventral pseudointerarea medially and allowingpassage for pedicle.pedicle muscles (BRACHIO) 1. In Articulata, adjuster musclesexternal to the pedicle and longitudinal fibrils in the connectivetissue of the pedicle. 2. In Inarticulata, muscles inthe wall and coelom of the pedicle.pedicle plate (BRACHIO) A tongue-like shell deposit inside thedorsal edge of the labiate foramen.pedicle sheath (BRACHIO) A tube projecting posteroventrallyfrom the ventral umbo; probably enclosing the pedicle inthe young stages of shell development with a supra-apicalpedicle foramen.pedicle tube (BRACHIO) A tube of secondary shell enclosingthe proximal part of the pedicle.pedicle valve (BRACHIO) The valve from which the pedicleusually emerges, generally larger than the brachial valve;