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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> 95asteroid a. [Gr. aster, star; eidos, form] 1. Refers to starlikeor resembling a star. 2. (ECHINOD) A stellate echinoderm <strong>of</strong>the subclass Asteroidea.Asteroidea n. [Gr. aster, star; eidos, form] A subclass <strong>of</strong> Somasteroidea<strong>of</strong> the phylum Echinodermata, containing thestellate sea stars and star fish; characterized by havingfive-radiate to multi-armed rays, usually not sharply <strong>of</strong>fsetfrom the central disk.asthenia n. [Gr. asthenes, feeble] Muscle weakness; debility.asthenobiosis n. [Gr. asthenes, feeble; biosis, manner <strong>of</strong> life](ARTHRO: Insecta) Hibernation or aestivation in certaingenerations <strong>of</strong> insects induced by non-elimination <strong>of</strong> uremicproducts by previous active generations.astichous a. [Gr. an, without; stichos, row] Not arranged in arow or rows.astigmatic a. [Gr. an, without; stigma, mark] Lacking stigmata;without a spiracle or breathing pore.astogenetic differences (BRYO) Differences in the morphology<strong>of</strong> an asexual generation <strong>of</strong> zooids, and thereby restrictedto zones <strong>of</strong> astogenetic change in the colony.astogeny n. [Gr. asty, town; genos, descent] (BRYO) The development<strong>of</strong> a colony through a sequence <strong>of</strong> asexual generations<strong>of</strong> zooids with any extrazooidal parts.astomate a. [Gr. a, without; stoma, mouth] 1. Lacking amouth. 2. (ANN: Oligochaeta) In earthworms, a closednephridium, without a nephrostome. 3. (NEMATA) Referringto a stoma lacking the cheilostome, but retaining an unexpandedesophastome.astragal n. [Gr. astragalos, vertebra] (MOLL: Gastropoda) Thestep-sided, rounded elevations <strong>of</strong> a shell, that extend spirallyaround the whorls giving added strength.astral ray 1. A ray seen in the cytoplasm that radiates fromeach centriole to the asters during cell division, thus formingthe spindle. 2. A polar ray.astral sphere see astrosphereastrocenter see centrosomeastrocyte n. [Gr. aster, star; kytos, container] 1. A star-

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