imago n. [L. imago, image] (ARTHRO: Insecta) 1. The adult or reproductive stage. 2. In termites, applied only to the adult primary reproductives. imaginai a.
imagochrysalis n. [L. imago, image; Gr. chrysallis, chrysalis] (ARTHRO: Chelicerata) In the chigger mite life cycle, a quiescent stage between the nymph and adult.
imbricate plates (ARTHRO: Crustacea) In Cirripedia, the lower lateral, lower latus, and lower latera.
imbrication n. [L. imbricare, to cover with tiles] An overlapping at the margins as of tiles or shingles. imbricate a.
immaculate a. [L. in, not; maculatus, spotted] Without colored spots or marks.
immarginate a. [L. in, not; marginatus, to enclose with a border] Without a definite rim or margin; having no colored rim or margin.
immature a. [L. in, not; maturus, ripe] Any developmental stages preceding the adult.
immersed a. [L. in, not; mergere, to dip] Inserted, imbedded or hidden, as a part or organ.
immunity n. [L. immunis, free] The ability of an organism to resist a pathogen; a type of resistance to disease.
immunogenic a. [L. immunis, free; gennaein, to produce]
Pertaining to a type of substance that stimulates production of antibody or cell-mediated immunity.
imperfect mesentaries (CNID: Anthozoa) Mesentaries spanning the gastrovascular space, but not reaching the actino-pharynx. see perfect mesentaries.
imperforate a. [L. in, not; perforatus, to bore through] 1. Not perforated; lacking an opening or aperture. 2. (MOLL: Gastropoda) see anomphalous.
implex n. [L. implexus, plaited] (ARTHRO: Insecta) Integu-mental infolding for muscle attachment; endoplica.
implicate a. [L. implicare, to entangle] To infold or twist together.
impregnation n. [L. impraegnare, to cause to conceive] To make pregnant; the introduction of sperm cells; fecundate.
impressed a. [L. in, on; premere, to press] 1. Produced by pressure; depressed areas or markings. 2. (MOLL: Gastropoda) A suture of a shell having both adjoined whorl surfaces turned inward adaxially.
imprint n. [L. in, on; premere, to press] (MOLL: Bivalvia) The impression on the valve of a muscle or gill.
impunctate a. [L. in, not; punctum, puncture] Without marks, pits, spots or holes.
inaequipartite a. [L. in, not; aequipartus, equal] (MOLL: Bival-via) Pertaining to bivalves with one end longer than the other.
inanition n. [L. inanis, empty] 1. The state of being empty; inane. 2. Exhaustion from lack of nutrients; the physical condition resulting from insufficient nutrients. 3. A form of dormancy brought about by insufficient nutrients.
inappendiculate a. [L. in, not; appendix, appendage] Without appendages.
inarticulate a. [L. in, not; articulatus, jointed] Not jointed or fitted together; lacking distinct body segments.
inarticulate hinge (MOLL) Lacking visible teeth or equipped only with a callosity.
inaxon n. [Gr. in, not; axon, axis] A neuron in which the axon branches at a distance from the neurocyte.
inbreed v.t. [A.S. in, inward; bredan, nourish] To mate with genetically similar individuals, particularly with close relatives; endogamy.
inbreeding depression A loss of fitness due to severe inbreeding.
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