Propus see propodite

prorhabdion n. [Gr. pro, before; rhabdion, little rod] (NEMATA)

The wall of the prostome. see rhabdion.

prosartema n. [Gr. pros, forward; artema, earring] (ARTHRO: Crustacea) In Decapoda, a row of dense setae on the inner margin of the basal segment of the antennular peduncle; also called eye brush.

proscolex n. [Gr. pro, before; skolex, worm] (PLATY: Cestoda) The anterior part of a divided scolex.

prosiphonate lining (PORIF: Calcarea) In recent Sphinctozoa, the lining of the atrial cavity of one chamber growing forward into the base of the next-youngest chamber.

prosochete n. [Gr. proso, forward; chetos, need] (PORIF) An inhalant canal that lead to chambers.

prosocline a. [Gr. proso, forward; klinein, to slant] 1. (MOLL: Bivalvia) Hinge teeth or shell sloping anteriorly. 2. (MOLL: Gastropoda) Usually referring to growth lines leaning forward (adapically) with respect to the direction of the heli-cocone.

prosocyrt a. [Gr. proso, forward; kyrtos, curved] (MOLL: Gastropoda) Used to describe the growth direction of the heli-cocone curving forward.

prosodus n.; pl. -i [Gr. prosodos, procession] (PORIF: Des-mospongiae) Tiny channels between the inhalant canal system and exhalant canals. see aphodus.

prosogyrate a. [Gr. proso, forward; gyros, a circle] (MOLL: Bivalvia) Describing beaks anteriorly directed; prosocoelous.

prosoma n. [Gr. pro, before; soma, body] 1. (ARTHRO) The anterior part of the body, usually applied to the cephalothorax. 2. (ARTHRO: Chelicerata) Fused imperceptably to the opisthosoma in Acari. see proterosoma. 3. (ARTHRO: Crustacea) Commonly limited by the major articulation; in barnacles, large saclike body in position of head in front of, and rostrad to, thoracic appendages; prosome. 4. (ARTHRO: Insecta) The head and the two succeeding fused segments of Coccoidea. prosomal a.

prosome n. [Gr. pro, before; soma, body] The anterior body region, specifically used in Phoronida.. see prosoma.

prosopon n. [Gr. proso, forward; ponos, work] (MOLL: Bival-

via) The name proposed to replace surface ornament or sculpture.

prosopore n. [Gr. proso, forward; poros, channel] (PORIF) An aperture leading to a prosochete.

prosopyle n. [Gr. proso, forward; pyle, gate] (PORIF) The opening of the incurrent canal into the flagellated chamber; sieve area.

prostal n.; pl. -ia [L. pro, before; stare, stand] (PORIF) Spicules that project from the sponge; marginal prostalia encircle the osculum; pleural prostalia are on the body surface; basal prostalia form root or anchoring spicules.

prostate/prostatic glands 1. (ANN: Oligochaeta) In earthworms, atrial glands of unknown function. 2. (MOLL) An elaboration of the sperm canal that secretes a prostatic solution. 3. (NEMATA: Secernentea) A gland emitting an adhesive secretion at the distal end of the ejaculatory duct. 4. (PLATY: Turbellaria) The spermiducal glands.

prosternal furrow (ARTHRO: Insecta) In many Reduviidae and Phymatidae in the Hemiptera, a cross-striated furrow; stridulation is produced by the rugose apex of the rostrum rubbing over it.

prosternal process, spine or peg (ARTHRO: Insecta) In Elat-eridae Coleoptera, a process extending backward into the mesosternal cavity.

prosternum n. [L. pro, before; sternum, breast bone] (ARTHRO: Insecta) The sternum, or ventral sclerite of the prothorax.

prostheca n. [Gr. pros, near; theke, case] (ARTHRO: Insecta) The small movable lobe-like process near the extremity of the mandible; the lacinia mobilis.

prosthetic group A non-peptide portion of an enzyme (may be organic or inorganic) that is responsible for the specific biological action of the protein. see coenzyme, cofactor.

prostome, prostom n. [Gr. pro, before; stoma, mouth] (NEMATA) The anterior subdivision of the protostome. see mesostome, metastome.

prostomial peaks (ANN: Polychaeta) Sclerotized antero-lateral projections of the prostomium.

prostomium n. [Gr. pro, before; stoma, mouth] 1. The anterior preoral unsegmented portion of a segmented animal's body. 2. An acron. 3. (ANN: Oligochaeta) The anterior protuberance above the mouth in the first segment; a preoral lobe. prostomial a.

protaesthesis n. [Gr. protos, first; aisthesis, sense] A primitive sensilla or sense-bud.

protamphibion n. [Gr. protos, first; amphibios, double life] (ARTHRO: Insecta) The hypothetical common ancestor of Plecoptera, Ephemeridae and Odonata. see protentomon.

protandrous hermaphrodite A hermaphrodite that functions first as male and then transforms into female. see proto-gynous hermaphrodite.

protandry n. [Gr. protos, first; aner, male] 1. Maturation of the male gonads, then of the female organs, within a hermaphroditic individual. 2. Males appear earlier in the season than females. protandrism n. see protogyny.

protaspis larva (ARTHRO: Trilobita) Larval period after emergence from the egg, covered by a single, dorsal carapace and consisting of an acron and four postoral segments. see meraspis larva.

protease n. [Gr. proteios, primary; -ase, enzyme] Any proteolytic enzyme.

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