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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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312Maggenti and Gardnertera, a simple cuticular tube formed around the old spiracleand through which the old spiracle and trachea are pulledduring molting.ecdysis n., pl. -ses [Gr. ekdysis, getting out <strong>of</strong>] Molting, theprocess <strong>of</strong> shedding cuticle or exoskeleton. see molt,apolysis, endysis.ecdysone n. [Gr. ekdysis, getting out <strong>of</strong>] (ARTHRO) A hormonethat initates changes in cells associated with molting, producedby a secretion <strong>of</strong> the prothoracotrophic hormonefrom the median neurosecretory cells <strong>of</strong> insects, and the Y-gland <strong>of</strong> crustaceans.ecdysotrophic cycle (ARTHRO) Alternation <strong>of</strong> blood feedingand molting in mites, ticks, and hemimetabolous insects.ecesis n. [Gr. ek, out <strong>of</strong>; -esis, denotes action] The migration<strong>of</strong> organisms into a new habitat.echinate a. [Gr. echinos, spiny] Set with prickles; spinous;having some or all <strong>of</strong> the surface <strong>of</strong> the body covered withspines.echinating spicule (PORIF) A megasclere that protrudes froma fiber or spicule tract.Echinodermata, echinoderms n.; n.pl. [Gr. echinos, spiny;derma, skin] Phylum <strong>of</strong> marine coelomate animals with basicpentaradiate symmetry in the adult, with a calcareousendoskeleton and a water vascular system.echinopaedium see dipleurulaechinostome cercaria (PLATY: Trematoda) A cercaria having acollar with spines around the margin <strong>of</strong> the head and a longslender tail.echiopluteus larva Sea-urchin larva.Echiura, echiurans n.; n.pl. [Gr. echis, serpent; oura, tail] Aphylum <strong>of</strong> s<strong>of</strong>t-bodied, unsegmented, sac-like almost exclusivelymarine invertebrates with a large fluid-filled bodycavity; related to Sipuncula and somewhat resemblingthem.ecitophile a. [NL. Eciton, a genus <strong>of</strong> ants; L. philos, loving](ARTHRO: Insecta) An obligatory guest <strong>of</strong> the tribe Ecitonini.ecium see zooecium

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