I-band That zone of the sarcomere composed of actin alone.

I-cells (CNID) The interstitial cells.

ichnotaxon n. [Gr. ichnos, track; taxis, arrangement] A taxon based on fossilized impressions, tracks, trails, and burrows made by an animal, but not part of that animal.

ichthyophagous a. [Gr. ichtys, fish; phagein, to eat] Eating, or subsisting on fish.

iconotype n. [Gr. eikon, image; typos, type] A graphic reproduction of a type.

icotype n. [Gr. eikos, to be like; typos, type] A representative specimen serving for purpose of identification, but has not been used in published literature.

ICZN The International Code of Zoological Nomenclature.

ideotype n. [Gr. idios, personal; typos, form] A specimen named by the author after comparison with the type species. see type.

idiobiology n. [Gr. idios, personal; bios, life; logos, discourse] The biology of an individual organism.

idiochromatin n. [Gr. idios, personal; chroma, color] Nuclear chromatin thought to function as structural support for genes.

idiochromosome n. [Gr. idios, distinct; chroma, color; soma, body] A sex chromosome.

idiocuticular a. [Gr. idios, personal; L. cuticula, cuticle] Of or pertaining to characteristics of a cuticle; produced in the cuticle such as the microtrichia of insect epicuticle.

idiogamy n. [Gr. idios, distinct; gamos, marriage] Self-fertilization.

idiogram n. [Gr. idios, distinct; gramma, drawing] A diagrammatic representation of chromosome morphology.

idiomorphic a. [Gr. idios, personal; morphe, form] (MOLL: Bi-

valvia) The normal form of valves; not distorted by crowding or attachment to the substrate; automorphic.

idionymy n. [Gr. idios, personal; onyma, name] State of an organ which makes it possible to receive its own distinct nomenclatorial designation, either in ontogeny, or a comparative study of a natural group. idionymous a.

idioplasm n. [Gr. idios, personal; plasma, formed or molded] All of the hereditary determinants of an organism, both nuclear and cytoplasmic; germ plasm; idiotype. see genotype.

idiosoma n. [Gr. idios, personal; soma, body] (ARTHRO: Cheli-cerata) In mites or ticks, the posterior of the two basic parts of the body, prosoma and opisthosoma; pseudo-tagma.

idiosome n. [Gr. idios, personal; soma, body] 1. A purported ultimate element of living matter; micelle. 2. The sphere or region of differing cytoplasm viscosity surrounding the centrosome, surrounding Golgi apparatus and mitochondria.

idiosphaerotheca n. [Gr. idios, personal; sphaira, globe; theke, sac] A vesicle containing the acrosome of sperm cells.

idiotaxonomy n. [Gr. idios, personal; taxis, arrangement; nomos, law] Taxonomic study of individuals, populations, species and higher taxa; traditional taxonomy.

idiotaxy n. [Gr. idios, personal; taxis, arrangement] Homono-mous organs having a common relative placement, even with secondary multiplication.

idiotrichy n. [Gr. idios, personal; trichos, hair] Homonomous setae which share a common relative placement even in the case of secondary multiplication.

idiotype n. [Gr. idios, personal; typos, type] Genotype; idioplasm.

idorgan n. [Gr. idios, personal; organon, organ] A morphological multicellular unit composing an organ, antimere, or metamere, absent of characters of an individual or colony.

ileocecal a. [L. ileum, flank; caecus, blind] (ARTHRO: Insecta)

Pertaining to the valve at the junction of the large and small intestine.

ileum n. [L. ileum, flank] (ARTHRO: Insecta) 1. An undifferentiated tube running back to the rectum; the anterior part of the hind-gut. 2. In termites in the form of a pouch in which flagellate protozoa live.

imaginai a. [L. imago, image] (ARTHRO: Insecta) Pertaining to the adult or imago.

imaginai disc, bud or cell (ARTHRO: Insecta) In holome-tabolous forms, embryonic tissue which remains undifferentiated until they give rise to the imago (adult) structures.

imagination n. [L. imago, image] (ARTHRO: Insecta) The development of an imago or adult.

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