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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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652Maggenti and Gardnervelopment <strong>of</strong> its taxon. 2. The regeneration or restoration<strong>of</strong> a lost part. 3. Abrupt metamorphosis. see cenogenesis,recapitulation theory.palintrope n. [Gr. palin, back; tropos, turn] (BRACHIO) The recurvedpart <strong>of</strong> the ventral valve that fills the gap betweenthe beak and hinge line in the dorsal valve <strong>of</strong> some shells.palisade n. [L. palus, stake] (ARTHRO: Insecta) The clear regionformed around the rhabdom in a light-adapted euconeapposition eye when exposed to darkness.pallets n.pl. [L. dim. pala, spade] (MOLL: Bivalvia) Two variouslyshaped calcareous structures at the siphonal tip <strong>of</strong>some woodboring forms; abrading tools.pallial a. [L. pallium, mantle] (MOLL) Of or pertaining to themantle.pallial artery (MOLL) An artery that supplies blood to the mantle.pallial chamber or cavity (MOLL) The mantle cavity.pallial complex (MOLL) All <strong>of</strong> the organs <strong>of</strong> the mantle cavitycombined (ctenidia, osphradia, anus, renal and genitalopenings and glands).pallial curtain (MOLL: Bivalvia) The inner fold <strong>of</strong> the mantleedge <strong>of</strong> oysters, with a row <strong>of</strong> tentacles, supplied withmuscles and blood sinuses.pallial duct (MOLL: Gastropoda) Region <strong>of</strong> the genital duct thathas undergone elaboration or differentiation to provide forsperm storage and egg membrane formation.pallial groove (MOLL: Polyplacophora) Ventral groove markingthe separation between the foot and mantle.pallial line (MOLL: Bivalvia) A fine, single-lined impression nearthe periphery <strong>of</strong> each valve, produced by the edge <strong>of</strong> themantle and indicating the internal line <strong>of</strong> attachment <strong>of</strong> themantle to the shell.pallial markings see vascular markingspallial nerves (MOLL) The pair <strong>of</strong> large dorsal nerves that innervatethe mantle.pallial region (MOLL: Bivalvia) Marginal region inside the shell

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