Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

88Maggenti and Gardnershell.arm n. [A.S. arm, forelimb] 1. Anything resembling or correspondingto an arm. 2. (ECHINOD) a. In Asteroidea, the radialextension of the body surrounding the axis; the ambulacra.b. In Crinoidea, the radial evagination of the bodyextending from the theca; undivided distal branches. 3.(ECHI) The forked section of the proboscis. 4. (MOLL:Cephalopoda) a. In squids and cuttlefish, eight of the tenshort and heavy appendages around the head, the othertwo larger dorsal appendages being tentacles. b. The tentaclesof an octopod.armate cercaria (PLATY: Trematoda) A larva of the xiphidiocercariaegroup with oral and ventral suckers unequal,without a virgula organ and with a Y-shaped excretorybladder.armature n. [L. armare, to arm] Defensive or protectivestructures of invertebrates, such as spinous or chitinousprocesses in the form of hooks, horns, teeth, spines andclaws on various parts of the body.armilla n.; pl. -lae [L. armilla, bracelet] Bearing a bracelet-likering or annulus. armillate a.arolium n.; pl. -ia [Gr. arole, protection] (ARTHRO: Insecta) Amedium lobe or pad-like cushion of the foot. a. Betweenthe claws of Orthoptera. b. The base of each tarsal claw ofHemiptera. c. Between the tarsal claws and comprising partof the pretarsus of Hymenoptera. see pseudarolium.aromorphosis n.; pl. -ses [Gr. airein, to raise; morphosis,shaping] An advancement in organization of an organism,without a marked increase in specialization; an aromorph.see allomorphosis.arrhenogeny n. [Gr. arrhen, male; genos, offspring] The conditionof producing only male offspring. see monogeny,thelygeny.arrhenoidy n. [Gr. arrhen, male; eidos, form] (NEMATA: Secernentea)Sex reversal from female to male; recognizedby males having two testes, instead of one. arrhenoid a.arrhenoplasm n. [Gr. arrhen, male; plasma, formed ormolded] The male element of idioplasm.