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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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846Maggenti and Gardnercle-shaped.spiral n. [L. spira, coil] A curved line or surface extending outwardwith continuously increasing radius <strong>of</strong> curvature.spiral amphid (NEMATA: Adenophorea) A coiled amphid tubebeneath the cuticle that appears as a spiral.spiral cleavage A type <strong>of</strong> early embryonic cleavage in which,after the first few divisions, the cells <strong>of</strong> the upper quartet inthe eight-celled stage lie above and between the cells <strong>of</strong>the lower quartet and thus tend to form a spiral pattern.spiral conic (MOLL: Gastropoda) In Trochidae, an advancingspiral, winding around an axis and forming a cone shape.spiralia n.pl.; sing. spiralium [L. spira, coil] (BRACHIO) Twospirally coiled supports <strong>of</strong> the secondary shell for the plectolopheor spirolophe.spiral thread/filament see taenidiumspiramen n. [L. spiramen, vent] (BRYO) A median pore, notconnected to the ascus, in the frontal wall on the proximalside <strong>of</strong> the orifice.spirasters n.pl. [L. spira, coil; aster, a star] (PORIF) Spirallytwisted streptasters.spire n. [L. spira, coil] (MOLL: Gastropoda) The complete series<strong>of</strong> whorls <strong>of</strong> a spiral shell except the last.spire angle (MOLL: Gastropoda) In plane through entire shellaxis, angle between two straight lines that touch all thewhorls on opposite sides; these lines can only be drawn ifthe rate <strong>of</strong> the whorl increase is constant.spirignath, spiritrompe see galeaspirocyst n. [L. spira, coil; Gr. kystis, bladder] (CNID: Anthozoa)In Zoantharia, a type <strong>of</strong> nematocyst with a thin, single-wallcapsule that is acidophilic and contains a long,spirally coiled, unarmed thread <strong>of</strong> uniform diameter. seenematocyst.spirogyrate a. [L. spira, coil; gyratus, circular] (MOLL: Bivalvia)1. Umbones coiled outward from the saggital plane. 2.In oysters, having the beak in a distinct spiral.spiroid a. [L. spira, coil] Spiral-shaped.

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