Epigaen see epigean

epigamic a. [Gr. epi, upon; gamos, marriage] Serving to attract individuals of the opposite sex during courtship; the colors displayed during courtship.

epigastric furrow (ARTHRO: Chelicerata) A transverse ventral suture near the anterior end of the abdomen of spiders, along which lie the opening of the book lungs and in the middle the reproductive organs.

epigastric lobe or area (ARTHRO: Crustacea) In Decapoda, the anterior extension of the gastric region of the carapace.

epigastrium n. [Gr. epi, upon; gaster, stomach] 1. (ARTHRO: Chelicerata) In spiders, the ventral portion of the opistho-soma. 2. (ARTHRO: Insecta) The ventral side of the meso-and metathorax.

epigean, epigaen a. [Gr. epi, upon; gaia, earth] Living at or above the soil surface; epigeic; epigenous. see endogean, hypogean.

epigenesis n. [Gr. epi, upon; genesis, beginning] The theory that morphological complexity develops gradually from an essentially formless egg during embryology; during the 18th and 19th century debates, epigenesis represented the theory that complexity must be directed by a vital force from outside the system for normal development.

epigenetics n. [Gr. epi, upon; genesis, beginning] That branch of biology that deals with the causal analysis of development.

epigenotype n. [Gr. epi, upon; genesis, beginning; L. typus, type] The chain of interactions among genes resulting in the phenotype; the developmental system.

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