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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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704Maggenti and Gardnerfilled with fluid, contain retrorse spinules along the staff, orbe needlelike in appearance. 2. (ARTHRO: Insecta) Hollowseta through which they discharge an irritating secretionfrom the venom glands.polar body A minute, functionless cell produced and discardedduring the development <strong>of</strong> an oocyte.polar cap (MESO) The eight anterior cells in the nematogen.polar field/plate (CTENO) One <strong>of</strong> two long ciliated depressionsin the floor <strong>of</strong> the statocyst.polarity n. [L. polus, axis] The condition <strong>of</strong> having oppositepoles or qualities.polarization n. [L. polus, axis] 1. A potential difference acrossa membrane. 2. Light that is filtered to vibrate in one planeonly.polar plates 1. (CNID) Balance organs <strong>of</strong> two narrow ciliatedbands in the transverse plane. 2. (CTENO) see polarfield/plate.polar ray see astral raypolian tubules/villi see contractile tubulesPolian vesicles (ECHINOD) In Holothuroidea and Asteroidea,elongated sacs in the coelom that open into the ring canaland function as expansion chambers.polian vessel see contractile vesselpollen basket see corbiculapollen brush/comb see scopapollen pocket (ARTHRO: Insecta) In Hymenoptera, a reservoirfor pollen beside a cell in some species <strong>of</strong> bumblebees; larvaeand adults have free access to the pollen.pollen pot (ARTHRO: Insecta) In Hymenoptera, s<strong>of</strong>t cerumencontainer used to store pollen by stingless bees; larvae donot have direct access to the pollen.pollen rake (ARTHRO: Insecta) In Hymenoptera, a comblikerow <strong>of</strong> bristles at the apex <strong>of</strong> the hind tibia <strong>of</strong> a bee; apecten.pollen storers (ARTHRO: Insecta) In Hymenoptera, bumblebeesthat temporarily store pollen in abandoned cocoons.

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