Heterogonic coefficient see allometric coefficient

heterogonic life cycle Life cycle involving alternation of parasitic and free-living generations. see homogonic life cycle.

heterogony n. [Gr. heteros, different; gonos, seed] 1. Study of relative growth. see allometric growth. 2. Alternation of generations. see heterogamy. 3. Both males and females present in a colony.

heterogynous a. [Gr. heteros, different; gyne, woman] Having more than one type of female.

heteroideus a. [Gr. heteros, different; idios, personal] (AR-THRO: Insecta) Pertaining to larvae with a mesoseries of crochets bearing a well developed median series of hooks flanked on each end by smaller or rudimentary crochets. see homoideus.

heterology n. [Gr. heteros, different; logos, discourse] The lack of similarity between structures due to different components or of a different derivation. see anology, homol-ogy.

heterolysis n. [Gr. heteros, different; lysis, loosen] Disintegration of a cell or tissue by an external agent, either by lysins or enzymes. see autolysis.

heteromedusoid a. [Gr. heteros, different; Medousa, Medusa] (CNID: Hydrozoa) In Hydroida, a sessile gonophore of a styloid type.

heteromerous a. [Gr. heteros, different; meros, part] 1. Non-uniformity in number of parts between organisms of the same species, or organs on the same individual. see ho-meomerous. 2. (ARTHRO: Insecta) In Coleoptera, the tarsi are usually 5,5,4 segments in both sexes, occasionally 4,4,4, and rarely 3,4,4 in males, very rarely 3,3,3.

Heterometabola n. [Gr. heteros, different; metabole, change] In some classifications the division of Exopterygota excluding Hemimetabola.

heterometabolous, metamorphosis a. [Gr. heteros, different; metabole, change] (ARTHRO: Insecta) Developing by incomplete or direct metamorphosis where there is no pupal stage; the immature resemble adult insects and are known as nymphs.

heteromorph n. [Gr. heteros, different; morphe, form] (ARTHRO: Crustacea) An adult female dimorphic ostracod, recognizable by carapace structure.

heteromorphic a. [Gr. heteros, different; morphe, form] 1. Deviating from the normal form. 2. At different life stages progressing to another form; heteromorphous 3. Homologous chromosomes differing in size or form.

heteromorphosis n.; pl. -ses [Gr. heteros, different; morpho-sis, forming] The replacement of an organ or part in an abnormal position, especially one lost or removed; homoeo-sis. see homomorphosis.

heteromorphous a. [Gr. heteros, different; morphe, form] 1. Heteromorphic. 2. (ARTHRO: Insecta) Successive instars with differing forms and marked differences in development. see hypermetamorphosis.

heteromorphous armature (PLATY: Cestoda) Hooks that change radically in size and shape from internal to external surface of the tentacle.

heteromyarian a. [Gr. heteros, different; mys, muscle] (MOLL: Bivalvia) Having adductor muscles unequally developed. see homomyarian.

heteroneme n. [Gr. heteros, different; nema, thread] (CNID) A nematocyst with an open tip with a definite hampe.

heteronereid n. [Gr. heteros, different; Neris, family Neridi-dae] (ANN: Polychaeta) A specialized, free swimming, sexually dimorphic marine worm that gives off sex products into the water and dies after spawning. see epitoky.

heteronereis see epitoky heteronomous a. [Gr. heteros, different; nomos, usage] Having unlike segments; differing in development or function.

heteronomous hyperparasitoid (ARTHRO: Insecta) In Hy-menoptera, a species in Adelinidae in which the female develops as a hyperparasitoid of one host, while the male develops as a normal parasitoid on another host; an adelpho-parasite. see diaphagous parasitoid, heterotrophic parasitoid.

heteronomous parasitoid (ARTHRO: Insecta) In Hymenoptera species Aphelinidae, a parasitoid exhibiting heteronomy.

heteronomous segmentation Relative dissimilarity and specialization of certain body segments. see homonomous.

heteronychia n. [Gr. heteros, different; onyx, claw] (ARTHRO: Chelicerata) One or more legs with a different number of claws than the other legs in a particular mite stase.

heteropalpi n.pl. [Gr. heteros, different; L. palpus, feeler] (ARTHRO: Insecta) Palpi that differ in number of segments between male and female.

heteroparthenogenesis n. [Gr. heteros, different; parthenos, virgin; genesis, beginning] Cyclic parthenogenesis.

heteroploid a. [Gr. heteros, different; aploos, onefold; eidos, form] Designating a chromosome number deviating from the somatic number characteristic of the species; chromosome numbers may be either euploid or aneuploid.

heteropod a. [Gr. heteros, different; pous, foot] (MOLL: Gastropoda) Pertains to pelagic snails with a compressed foot adapted for swimming.

heteropycnosis, heteropyknosis n. [Gr. heteros, different; pyknos, dense] Certain chromosomes or regions of chromosomes that are out of phase in their coiling cycle and staining properties. heteropycnotic, heteropyknotic a.

heterorhabdic a. [Gr. heteros, different; rhabdos, rod] (MOLL: Bivalvia) Pertaining to plicate lamellibranchiate gill in which the filament in the bottom of the depression between two successive plicae is longer than the other filaments. see

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