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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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638Maggenti and Gardneroral plate (ARTHRO: Insecta) The hypopharyngeal floor <strong>of</strong> thecibarial pump.oral segment A ring or segment bearing the mouth.oral spear see stomatostyle, odontostyleoral styles (KINOR) Spines arranged in a series around themouth cone.oral surface (ECHINOD: Asteroidea) The entire undersurface <strong>of</strong>the disc and arms.oral tentacles (MOLL) Tentacle-like outgrowths <strong>of</strong> the lip.oral valve (ECHINOD: Crinoidea) One <strong>of</strong> 5 low triangular flapsseparating the ambulacral grooves.oral vibrissae (ARTHRO: Insecta) In certain Diptera, a pair <strong>of</strong>stout bristles or hairs on each side <strong>of</strong> the face, near orabove the oral margin; larger than those on the vibrissalridge.orb n. [L. orbis, circle] A circle or globe. orbicular a.orbit n. [L. orbis, circle] 1. (ARTHRO) The part <strong>of</strong> the headsurrounding an eye; orbital fossa. 2. (ARTHRO: Crustacea)In Decapoda, an opening in the anterior face <strong>of</strong> the carapacesupporting the ocular peduncle.orbital bristles see facio-orbitaorbital carina (ARTHRO: Crustacea) In Decapoda, the narrowregion on the margin <strong>of</strong> the orbit.orbital fossa see orbitorbital hiatus (ARTHRO: Crustacea) Gap or slit in the orbitalmargin.orbital plate see genovertical plateorbital region (ARTHRO: Crustacea) That part posterior to theeyes bordered by the frontal and antennal regions.orbital tooth (ARTHRO: Crustacea) A tooth on the orbital margin.orchitic a. [Gr. orchis, testis] Of or pertaining to testicles.order n. [L. ordin, methodical arrangement] A taxonomicgroup; a subdivision <strong>of</strong> a class or subclass, containing agroup <strong>of</strong> naturally related superfamilies or families.

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