elytral ligula (ARTHRO: Insecta) In beetles, a tongue and groove joint at the midline of the elytra which meet and hold them together.
elytriform a. [Gr. elytron, sheath; L. forma, shape] Shaped like or resembling an elytron.
elytrin n. [Gr. elytron, sheath; L. -ine, compound] (ARTHRO: Insecta) In Coleoptera, the chitinized composition of the body surface covering.
elytron n.; pl. -tra [Gr. elytron, sheath] 1. (ANN: Polychaeta) The numerous modified setae in the form of scales or plates. 2. (ARTHRO: Insecta) A thickened, leathery, or horny fore wing or wing cover of certain insects. see he-melytron. 3. Tegmen.
elytrophore n. [Gr. elytron, sheath; phoreus, bearer] (ANN) A process on the prostomium that bears an elytron.
emandibulate a. [L. ex, out of; mandibula, jaw] Lacking well developed mandibules.
emarginate a. [L. emarginatus, notched at the apex] 1. Having a margin or apex notched or indented. 2. (MOLL) Having the margin of the outer lip notched or variously excavated.
embolium n.; pl. -lia [Gr. embolos, wedge] (ARTHRO: Insecta)
1. In the hemipteran hemeletron, the narrow costal part of a wing, separated from the rest of the corium by a suture.
embolus n. [Gr. embolos, wedge] (ARTHRO: Chelicerata) 1. The distal division of the palpus of some spiders. 2. The in-tromittent portion of the male copulatory organ, containing a portion of the ejaculatory duct of spiders.
emboly n. [Gr. embole, anything inserted] The formation of a gastrula by the process of invagination.
embossed a. [ME. embossen, to hide] Ornamented with a raised pattern.
embryo n.; pl. embryos [Gr. embryon, fetus] A young organism before emerging from the egg, or the body of the mother.
embryogenesis n. [Gr. embryon, fetus; genesis, beginning] Formation and development of an embryo from an egg; embrogeny.
embryology n. [Gr. embryon, fetus; logos, discourse] The study of the formation, early growth and development of living organisms.
embryonic a. [Gr. embryon, fetus] 1. Pertaining to an embryo. 2. (MOLL: Bivalvia) Pertaining to a larval stage, as the free-swimming embryo of an oyster.
embryonic fission (BRYO) Division of the first embryo into secondary and tertiary embryos. see polyembryony.
embryonic shell (GASTRO) That part of the shell formed before hatching.
embryophore n. [Gr. embryon, fetus; phoreus, bearer] 1. (ENTO) The vestibular wall anterior to the anal cone to which the stalks of the eggs and embryos are attached. 2. (PLATY: Cestoda) The protective shell covering the developing onchosphere of some tapeworms.
emendation n. [L. emendatus, corrected] In nomenclature, an intentional change of the spelling of a previously published zoological name.
emergence n. [L. emergere, to come up] (ARTHRO: Insecta) The act of the adult winged insect leaving the pupal case, cocoon, or the last nymphal skin.
Emery's rule (ARTHRO: Insecta) The dulotic ants and the parasitic ants, both temporary and permanent, that generally originate from closely related forms that serve them as hosts.
emigration n. [L. emigrare, to move out] Moving from one permanent nesting area to another.
eminence n. [L. eminens, projecting] A ridge or projection on a surface.
emmet n. [ME. emete, ant] (ARTHRO: Insecta) An ant.
empodial hair (ARTHRO: Insecta) A bristle or hair on the tarsus or tibia of scale insects. see empodium.
empodium n.; pl. -dia [Gr. en, in; pous, foot] (ARTHRO: Insecta) A median bristle-, spine- or lobe-like process arising ventrally at the apex of the last tarsal segment, usually from the unguitractor plate. see arolium, digitules.
enamel n. [OF. esmaillier, to coat with enamel] (MOLL: Gastropoda) The glossy substance which forms the inductura of the shell.
enantiomorphic a. [Gr. enantios, opposite; morphe, form] Alike but contraposed as a mirror image.
enarthrosis n. [Gr. en, in; arthron, joint] An articulation; a ball and socket joint.
encapsulation n. [Gr. en, in; L. dim. capsa, box] 1. Enclosed in a capsule or membrane. 2. An animal host surrounding and walling off internal parasites; capsules often involve blood cells, or melanin formation.
encephala a. [Gr. encephalos, brain] (MOLL) Pertaining to bearing a head and usually protected by a spiral shell.
encephalon n. [Gr. encephalos, brain] The brain.
encrusting colony (BRYO) A colony in which most individuals are attached to the substrate.
encyst v.t. [Gr. en, in; kystis, bladder] To form a cyst, or become enclosed within. see excyst.
endemic a. [Gr. endemos, native] 1. Confined to a given region; indigenous, native. 2. Any disease occurring at the normal or expected level. see epidemic, pandemic.
end-hook (ARTHRO: Insecta) In Odonata, a small hook at the inner border of the lateral lobes of the labium.
endite n. [Gr. endon, within] 1. The inner lobe of any limb segment. 2. (ARTHRO: Chelicerata) The plate borne by the coxa of the pedipalps of most spiders, that functions as a crushing jaw. 3. (ARTHRO: Crustacea) The inwardly (medially) directed lobe of the precoxa, coxa, basis, or ischium.
endite lobes (ARTHRO: Insecta) The lacinia and galea on the inner apical angle of the stipes.
endobiotic a. [Gr. endon, within; bios, life] Living in the cells or tissues of another living organism. see exobiotic.
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