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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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<strong>Online</strong> <strong>Dictionary</strong> <strong>of</strong> <strong>Invertebrate</strong> <strong>Zoology</strong> 337<strong>of</strong> the body wall that secretes the cuticle; the hypodermis.2. (BRYO) Secretes cuticle and calcium carbonate <strong>of</strong> theskeleton. 3. (MOLL) The periostracum. epidermal a.epididymis n. [Gr. epi, upon; didymos, testicle] (ARTHRO: Insecta)The coiled part <strong>of</strong> the vas deferens.epifauna n. [Gr. epi, upon; L. Faunas, deity <strong>of</strong> herds andfields] Any animal living on the surface deposits <strong>of</strong> theocean. see infauna.epifrontal fold (BRYO: Gymnolaemata) In Umbonulidae, a fold<strong>of</strong> the exterior body wall and body cavity arching over thefrontal wall.epigaen see epigeanepigamic a. [Gr. epi, upon; gamos, marriage] Serving to attractindividuals <strong>of</strong> the opposite sex during courtship; thecolors displayed during courtship.epigastric furrow (ARTHRO: Chelicerata) A transverse ventralsuture near the anterior end <strong>of</strong> the abdomen <strong>of</strong> spiders,along which lie the opening <strong>of</strong> the book lungs and in themiddle the reproductive organs.epigastric lobe or area (ARTHRO: Crustacea) In Decapoda,the anterior extension <strong>of</strong> the gastric region <strong>of</strong> the carapace.epigastrium n. [Gr. epi, upon; gaster, stomach] 1. (ARTHRO:Chelicerata) In spiders, the ventral portion <strong>of</strong> the opisthosoma.2. (ARTHRO: Insecta) The ventral side <strong>of</strong> the mesoandmetathorax.epigean, epigaen a. [Gr. epi, upon; gaia, earth] Living at orabove the soil surface; epigeic; epigenous. see endogean,hypogean.epigenesis n. [Gr. epi, upon; genesis, beginning] The theorythat morphological complexity develops gradually from anessentially formless egg during embryology; during the18th and 19th century debates, epigenesis represented thetheory that complexity must be directed by a vital forcefrom outside the system for normal development.epigenetics n. [Gr. epi, upon; genesis, beginning] That branch<strong>of</strong> biology that deals with the causal analysis <strong>of</strong> development.

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