Ecoparasite see ecosite

ecophene n. [Gr. oikos, house; phainein, to appear] The range of phenotypes produced by one genotype within the limits of the habitat under which it is found in nature.

ecophenotype n. [Gr. oikos, house; phainein, to appear; typos, type] A nongenetic modification of the phenotype by specific ecological conditions, esp. habitat variation. eco-phenotypic a.

ecosite n. [Gr. oikos, house; sitos, food] A microparasite to which its host is immune under normal conditions; eco-


ecospecies n. [Gr. oikos, house; L. species, kind] A group of populations in an ecological niche that are among themselves, and with other ecospecies, capable of interbreeding without loss of fertility or vigor in the offspring; an ecotype.

ecosystem n. [Gr. oikos, house; systema, an ordered arrangement of things] Any entity or natural unit that includes living and non-living parts interacting to produce a stable system in which the exchange of materials between the living and non-living parts follows circular paths; the biotic community and its habitat.

ecotone n. [Gr. oikos, house; tonos, stretch, brace] A transition area between two adjacent ecological communities or biomes; usually containing many organisms from both, as well as some characteristic of (sometimes restricted to) the ecotone.

ecotype n. [Gr. oikos, house; typos, type] A local race arising as a result of genotypical response to a particular habitat; an ecospecies.

ecsoma n. [Gr. ek, out of; soma, body] (PLATY: Trematoda) The telescoping posterior part of the body.

ectad adv. [Gr. ektos, outside; L. ad, toward] From within toward the exterior. see entad.

ectadenia [Gr. ektos, outside; aden, gland] (ARTHRO: In-secta) A male accessory gland, ectodermal in origin; ectodene glands. see mesadenia.

ectal a. [Gr. ektos, outside] Exterior; outer surface of the body or body parts.

ectally adv. [Gr. ektos, outside] Near to or towards the body wall. see ental.

ectoblast n. [Gr. ektos, outside; blastos, bud] The outer wall of a cell; ectoderm; epiblast.

ectochone n. [Gr. ektos, outside; chone, funnel-shaped hollow] (PORIF) A funnel-shaped chamber into which the ostia empty.

ectocochleate a. [Gr. ektos, outside; L. cochlea, spiral] (moll) An externally coiled shell, as in Nautiloidea.

ectocommensal n. [Gr. ektos, outside; L. cum, together; mensa, table] A commensal symbiont that lives on the outer surface of its host.

ectocrine a. [Gr. ektos, outside; krinein, to separate] Any chemical released into the environment that includes al-lelochemics, pheromones, foods, and respiratory gases.

ectocyst n. [Gr. ektos, outside; kystis, bladder] (BRYO) The outer layer of the zooecium.

ectoderm n. [Gr. ektos, outside; derma, skin] The outer embryonic layer from which the epidermis of the body wall and nerve tissue are derived. ectodermal a. see choano-derm.

ectognathous condition Mouthparts external to the head, not enclosed; ectotrophous. see entognathous condition.

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