Endospine see papilla

endosternal ridge (ARTHRO: Insecta) A Y-shaped furca of higher insects, formed by the two apophyses of the euster-num arising together in the midline and only separating internally.

endosternite n. [Gr. endon, within; sternon, chest] 1. (ARTHRO) In various arthropods, an internal sclerotized ridge, plate or other process of the cephalic exoskeleton that functions for muscle and connective tissue attachment; sometimes called entosternite. 2. (ARTHRO: Crustacea) a. In Notostraca, the mesodermal plate beneath the anterior portion of the alimentary canal. b. In certain Decapoda, a firm calcareous plate of the anterior thorax between the nerve cord and alimentary canal. 3. (ARTHRO: Insecta) see apophyses.

endostome n. [Gr. endon, within; stoma, mouth] (ARTHRO: Crustacea) In some brachyuran Decapoda, a platelike part of the buccal frame; a palate.

endostracum n. [Gr. endon, within; ostrakon, shell] 1. (ARTHRO: Chelicerata) For arachnids, see epiostracum. 2. (ar-THRO: Insecta) The endocuticle. 3. (MOLL) The inner layer of a shell.

endostyle n. [Gr. endon, within; stylos, pillar] (MOLL) A special gland on the ctenidial axis, that produces mucus used for transport of particles to the mouth.

endosymbion(t) n. [Gr. endon, within; symbiosis, life together; on, being] An internal symbiont. see ectosymbi-ont.

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