isomerous a. [Gr. isos, equal; meros, part] Having equal number of parts, ridges or markings; homoeomerous. see heteromerous.
isometry n. [Gr. isos, equal; metron, measure] Growth of two body parts remaining constant relative to each other as body size increases.
isomorphic a. [Gr. isos, equal; morphe, form] Alike or identical in appearance; isomorphous. see anisomorphic.
isomorphism n. [Gr. isos, equal; morphe, form] Similarity of organisms of different ancestry. see heteromorphic.
isomyarian condition (MOLL: Bivalvia) Having adductor muscles equal or subequal in size; homomyarian.
isonym n. [Gr. isos, equal; onyma, name] The new name of a species, or higher classification being based upon the older name or basinym.
isopalpi n.pl.; sing. -us [Gr. isos, equal; L. palpus, feeler] Palpi with the same number of joints.
isophene, isophane n. [Gr. isos, equal; phainein, to show] 1. A line connecting points of equal expression of a clinally varying character. 2. A line connecting areas in a region at which a phenological phenomenon occurs simultaneously. 3. Lines at right angles to a cline on a map.
isophenon n.; pl. isophena [Gr. isos, equal; phainein, to show] Maintaining the same form, except sometimes in size, after a growing- or repetition-molt.
isophenous a. [Gr. isos, equal; phainein, to show] Showing characteristics of a phenotype.
isopodus a. [Gr. isos, equal; pous, foot] Having the legs alike and equal.
isopycnosis n. [Gr. isos, equal; pyknos, thick] Chromosome or chromosome regions which do not differ greatly from each other.
isopygous a. [Gr. isos, equal; pyge, rump] Having pygidium and cephalon equal in size.
isorhiza n. [Gr. isos, equal; rhiza, root] (CNID) A form of nematocyst in which the tube is open and the same diameter along the tube, responding to mechanical stimuli, and is used in anchoring the animal when it walks on its tentacles. see atrichous isorhiza, holotrichous isorhiza, basitrichous isorhiza.
isostrophic a. [Gr. isos, equal; strophe, turn] (MOLL: Gastropoda) Having two faces of the shell symmetrical with respect to a median plane perpendicular to axis.
isotomy a. [Gr. isos, equal; temnein, to cut] The process of regularly repeated bifurcation as in crinoid branchia.
isotrophic a. [Gr. isos, equal; tropein, to turn] Singly refracting, as the light stripes of voluntary muscle fibers. see anisotropic.
isotype n. [Gr. isos, equal; typus, image] 1. An animal, plant or group frequently found in two or more countries or life regions. 2. A specimen collected from the type locale or habitat at the same time as the holotype.
isotypical genus A description from more than one congeneric species.
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