Ecdysial glands see prothoracic glands

ecdysial membrane (ARTHRO: Insecta) A thin membrane formed from the lateral lamellae of the old procuticle that is tanned by the polyphenols and phenoloxidase associated with the new outer epicuticle during molting.

ecdysial tube (ARTHRO: Insecta) In some Diptera and Coleop-

tera, a simple cuticular tube formed around the old spiracle and through which the old spiracle and trachea are pulled during molting.

ecdysis n., pl. -ses [Gr. ekdysis, getting out of] Molting, the process of shedding cuticle or exoskeleton. see molt, apolysis, endysis.

ecdysone n. [Gr. ekdysis, getting out of] (ARTHRO) A hormone that initates changes in cells associated with molting, produced by a secretion of the prothoracotrophic hormone from the median neurosecretory cells of insects, and the Y-gland of crustaceans.

ecdysotrophic cycle (ARTHRO) Alternation of blood feeding and molting in mites, ticks, and hemimetabolous insects.

ecesis n. [Gr. ek, out of; -esis, denotes action] The migration of organisms into a new habitat.

echinate a. [Gr. echinos, spiny] Set with prickles; spinous; having some or all of the surface of the body covered with spines.

echinating spicule (PORIF) A megasclere that protrudes from a fiber or spicule tract.

Echinodermata, echinoderms n.; n.pl. [Gr. echinos, spiny; derma, skin] Phylum of marine coelomate animals with basic pentaradiate symmetry in the adult, with a calcareous endoskeleton and a water vascular system.

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