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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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<strong>Online</strong> <strong>Dictionary</strong> <strong>of</strong> <strong>Invertebrate</strong> <strong>Zoology</strong> 189tition. see character displacement.character gradient see clinecharacter index A numerical value, compounded from theratings <strong>of</strong> several characters, indicating a degree <strong>of</strong> difference<strong>of</strong> related taxa; also a rating <strong>of</strong> an individual, particularlya hybrid, in comparison with its most nearly relatedspecies.checkered see tessellatecheek groove see genal groovecheeks n.pl. [A.S. ceace, cheek] 1. In most invertebrates, thelateral portions <strong>of</strong> the head. 2. (ARTHRO: Insecta) Below theeyes and lateral to the mouth; parafacials. see gena. 3.(NEMATA) The ampulla <strong>of</strong> an amphid.cheilorhabdions n.pl. [Gr. cheilos, lip; dim. rhabdos, rod](NEMATA) The cuticularized walls <strong>of</strong> the cheilostome. seerhabdions.cheilostome n. [Gr. cheilos, lip; stoma, mouth] (NEMATA) Theanteriad region <strong>of</strong> the stoma, that is lined by external cuticleformation.cheironym see chironymchela n.; pl. chelae [Gr. chele, claw] 1. (ARTHRO) A lateralmovable claw on a limb: pincerlike, with opposed movableand immovable fingers; occasionally both fingers move. 2.(ARTHRO: Insecta) Has been applied to feet <strong>of</strong> some Anoplurain which the opposable claw performs a holdfastfunction. see claw. 3. (PORIF) A type <strong>of</strong> microsclere with ashort, straight or curved axis and recurved teeth at bothends.chelate a. [Gr. chele, claw] Pincerlike, or possessing or resemblingchelae.chelenchium see cheilostomechelicera n.; pl. -erae [Gr. chele, claw; keras, horn] (ARTHRO:Chelicerata) Anterior most pair <strong>of</strong> appendages, functioningin grasping, holding, tearing, crushing or piercing; pincherlikein scorpions, but modified as poison fangs in spidersand as biting mouth parts <strong>of</strong> ticks.cheliceral frame (ARTHRO: Chelicerata) That part <strong>of</strong> the tegu-

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