n. [Gr. epi, upon; ostrakon, shell]
(ARTHROPODA: Chelicerata)
1. A thin elastic, colorless layer of the cuticle of arachnids which overlies the ectostracum layer; further divided into two layers: inner, dense and proteinaceous, and outer, cuticulin.
2. The upper layer of cuticle of arachnids.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • cerotegument — n. [L. cera, wax; tegumentum, covering] (ARTHROPODA: Chelicerata) In Acari, tegumental layers generally distinguishable by an outer cement layer covering the lipid layer; part of the epiostracum; part of the epicuticle; superficial epicuticular… …   Dictionary of invertebrate zoology

  • chitonostracum — n. [Gr. chiton, tunic; ostrakon, shell] (ARTHROPODA: Chelicerata) In Acari, the thickest layer of the cuticle between epiostracum and hypodermis; see ectostracum …   Dictionary of invertebrate zoology

  • cuticulin layer — 1. (ARTHROPODA: Chelicerata) In mites, the epiostracum. 2. (ARTHROPODA: Insecta) Layer extending over the surface of the body and over cuticular projections such as bristles and scales as well as epidermal invaginations …   Dictionary of invertebrate zoology

  • endostracum — n. [Gr. endon, within; ostrakon, shell] 1. (ARTHROPODA: Chelicerata) For arachnids, see epiostracum. 2. (ARTHROPODA: Insecta) The endocuticle. 3. (MOLLUSCA) The inner layer of a shell …   Dictionary of invertebrate zoology

  • epicuticula — n. [Gr. epi, upon; L. dim. cutis, skin] 1. (ACANTHOCEPHALA) See glycocalyx. 2. (ARTHROPODA) The thin, outermost nonchitinous exterior layer of arthropod cuticle. 3. (ARTHROPODA: Chelicerata) For mites see epiostracum …   Dictionary of invertebrate zoology

  • ACARIENS — Homère parle des tiques (Ixodes ) à propos du chien d’Ulysse, Argos, qui en était couvert. Aristote connaissait plusieurs espèces d’Acariens: sous le nom d’Akari (qui n’est pas divisé), il décrit un parasite rouge qui pouvait être une larve de… …   Encyclopédie Universelle

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