Ectohormones see pheromone

ectolecithal a. [Gr. ektos, outside; lekithos, yolk of an egg] (platy: Turbellaria) Having cleavage modified by a special condition whereby yolk is stored in separate cells surrounding the oocytes as opposed to entolecithal as seen in other animal phyla whose eggs contain yolk.

ectomere n. [Gr. ektos, outside; meros, part] A blastomere forming the ectoderm.

ectomesenchyme n. [Gr. ektos, outside; mesos, middle; chyma, anything poured] 1. A structure with organized cells that functions in epithelial interfaces, muscular sheets, and neuroid networks. 2. (PORIF) All components except for the flagellated cells.

ectomesoderm n. [Gr. ektos, outside; mesos, middle; derma, skin] Mesoderm derived chiefly from the ectoderm during early embryology of animals; forming mesenchyme pre-dominently in Porifera, Ctenophora and in certain mollusks and annelids.

ectoneural a. [Gr. ektos, outside; neuron, nerve] (ECHINOD) Pertaining to the oral part of the nervous system (sensory and motor).

ectooecium n. [Gr. ektos, outside; oikos, house] (BRYO) The outer layer of the oecial wall; usually calcified.

ectoparasite n. [Gr. ektos, outside; para, beside; sitos, food] A parasite feeding on a host from the exterior. ectopara-sitic a.

ectophagous a. [Gr. ektos, outside; phagein, to eat] Feeding externally.

ectophallus n. [Gr. ektos, outside; phallos, penis] (ARTHRO: Insecta) The outer phalic wall. see endophallus.

ectopic a. [Gr. ek, out of; topos, place] 1. Occurring in an abnormal place. 2. A parasite in an organ in which it does not normally live. see entopic.

ectoplasm n. [Gr. ektos, outside; plasma, to form or mold] An external or cortical layer of protoplasm in a cell. see endo-plasm.

ectoproct n. [Gr. ektos, outside; proktos, anus] (ARTHRO: Insecta) In certain Neuroptera, a plate of the anal segment, including the fused anoprocess, cerci and catoprocess.

Ectoprocta, ectoprocts see Bryozoa ectoptygma see serosa ectosomal spicule (PORIF) A spicule occurring in the ecto-somal region.

ectosome n. [Gr. ektos, outside; soma, body] (PORIF) The outer region that consists of dermal membrane and subdermal spaces, but is not supported by any special skeleton; pinacoderm.

ectospermalege n. [Gr. ektos, outside; sperma, seed; legein, to gather] (ARTHRO: Insecta) In females, one to two cuticular pouches, variable in position, functioning for the reception of the male clasper and penis. see Ribaga's organ.

ectostracum n. [Gr. ektos, outside; ostrakon, shell] (ARTHRO: Chelicerata) 1. In acarology, the outermost layer of the chitonostracum layer that when sclerotized is normally colored; stains with acid dyes. see chitonostracum. 2. The middle layer of integument of arachnids.

ectosymbion(t) n. [Gr. ektos, outside; symbiosis, life together; on, being] A symbiont that lives on or among its hosts. see endosymbiont.

ectothermal n. [Gr. ektos, outside; therme, heat] The body temperature is determined by that of the environment; poikilothermal.

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