Pedal levator muscle see pedal retractor muscle

pedal lobe (ARTHRO: Insecta) A fleshy, bump-like, non-segmented rudimentary leg of a larva.

pedal pit (MOLL: Solengastres) A ciliated pit containing secretory cells at the anterior end of the pedal groove.

pedal protractor muscle (MOLL: Bivalvia) The muscle that extends the foot.

pedal retractor muscle (MOLL: Bivalvia) The muscle attached to the shell that withdraws the foot; pedal levator muscle.

pedal stridulating organ (ARTHRO: Insecta) In male Hemip-terous Corixidae, the spinose area on the inside of each front femur when drawn over the edge of the clypeus.

pedamina; sing. -um [L. pes, foot; mina, projecting point] (ARTHRO: Insecta) In Lepidoptera, the aborted forelegs of a nymph.

peddler n. [ME. pedlere, fr. ped, basket] (ARTHRO: Insecta) A larva of Cassidinae Coleoptera, having a forked caudal process supporting excrement and exuviae.

pedicel n. [L. pediculus, little foot] 1. Any small or short stalk or stem supporting an organ or other structure. 2. (ARTHRO: Chelicerata) In Arachnida, the attenuated first abdominal segment, joining the abdomen to the cephalothorax. 3. (ARTHRO: Insecta) a. The second segment of the antenna. b. An ovariole stalk, or short duct connecting the egg tubes with the later oviduct. c. In Formicidae, the stem of the abdomen, between the thorax and gaster.

pedicellariae [L. pediculus, little foot] (echinod) In

Echinoidea and Asteroidea, stalked pincer-like structures, usually armed with teeth, used for removal of foreign particles and prevention of larvae of sessile organisms from settling on the animal; sessile pedicellariae are composed of two or more short, movable spines on the same or adjacent ossicles.

pedicellate a. [L. pediculus, little foot] Supported by a pedicel or petiole.

pedicellus spines (ARTHRO: Insecta) In Hymenoptera and Diptera, sensory spines at the bases of the antennae that play a role in the perception of gravity and possibly current stimuli.

pedicle n. [L. pediculus, little foot] (brachio) A variously developed, tough flexible stalk protruding from the bivalve shell; functioning as a tether, a pivot around which the shell may be moved, or as a locomotory organ.

pedicle collar (brachio) The two deltidial plates curved around the pedicle base, may or may not be fused.

pedicle foramen (BRACHIO) Ring-like perforation of a shell through which the pedicle passes.

pedicle groove (BRACHIO) When present, subtriangular groove dividing the ventral pseudointerarea medially and allowing passage for pedicle.

pedicle muscles (brachio) 1. In Articulata, adjuster muscles external to the pedicle and longitudinal fibrils in the connective tissue of the pedicle. 2. In Inarticulata, muscles in the wall and coelom of the pedicle.

pedicle plate (brachio) A tongue-like shell deposit inside the dorsal edge of the labiate foramen.

pedicle sheath (BRACHIO) A tube projecting posteroventrally from the ventral umbo; probably enclosing the pedicle in the young stages of shell development with a supra-apical pedicle foramen.

pedicle tube (brachio) A tube of secondary shell enclosing the proximal part of the pedicle.

pedicle valve (brachio) The valve from which the pedicle usually emerges, generally larger than the brachial valve;

ventral valve.

pedigerous a. [L. pes, foot; gerare, to carry] Bearing footlike appendages.

pedipalp, pedipalpus n.; pl. -pi [L. pes, foot; palpare, to touch] (ARTHRO: Chelicerata) The second pair of cephalo-thoracic appendages, variously modified as a pincerlike claw, or simple leg-like in different groups.

pedisulcus n. [L. pes, foot; sulcus, furrow] (ARTHRO: Insecta) In Diptera, an indentation near the base of the second hind tarsal segment of some Simuliidae.

pedium n.; pl. -dia [Gr. pedion, open plain] (ARTHRO: Insecta) In scarabaeoid larvae, the central part of the epipharynx, bare and soft-skinned, between the haptomerum and hap-tolachus; crossed on the left side by the epitorma.

pedofossae [L. pes, foot; fossa, ditch] (ARTHRO: Cheli-cerata) In Acari, concavities in the podosoma into which legs II, III and IV can be tucked.

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