Metameric sac see osmeterium

metamerism n. [Gr. meta, after; meros, part] Segmental repetition of homologous body parts; metameres; me-tasomes.

metameron n. [Gr. meta, after; meros, upper thigh] (ARTHRO: Insecta) In Diptera, the meron of the metathorax; a vertical sclerite above the hindcoxa. see mesomeron, meron.

metameros n. [Gr. meta, after; meros, part] (ARTHRO: Insecta) In Lepidoptera, the combined sixth to eighth abdominal segments.

metamorphosis n.; pl. -ses [Gr. meta, change of; morphe, form] A marked change in form or structure an animal undergoes from one growth stage to another; also applies to the actual process of changing from larval to adult form. see anamorphosis, epimorphosis, hypermetamorpho-sis.

metanauplius n. [Gr. meta, after; nauplios, shellfish] (AR-THRO: Crustacea) One to several larval stages subsequent to the first (nauplius) larva; characterized by increasing size and the appearance of additional appendages.

metandry n. [Gr. meta, after; aner, male] (ANN) Possessing only the posterior pair of testes; in earthworms, testes restricted to segment xi. metandric a. see proandry, holandry.

metaneme n. [Gr. meta, after; nema, thread] (NEMATA) Filamentous organs in or near the lateral epidermal cords that usually have anterior and sometimes posterior filaments and a central scapulus; thought to be stretch receptors. see orthometaneme, propriocepter.

metanephridium n.; pl. -ia [Gr. meta, after; nephros, kidney] Paired osmoregulatory or excretory tubules in some phyla; tubules that open into the body cavity and are found in coelomate animals.

metanephromixium n. [Gr. meta, after; nephros, kidney; mixis, mingling] (ANN: Polychaeta) Nephromixium in which the coelomostome and nephrostome are combined into a genital and/or excretory duct. see mixonephridium.

metanotal gland (ARTHRO: Insecta) In male Oecanthus (Or-thoptera) and some blattids, special glands on the dorsum of the thorax that produces a secretion attractive to females.

metanotal slopes (ARTHRO: Insecta) In Diptera, the pleuro-tergites.

metanotum n.; pl. -nota [Gr. meta, after; notos, back] (AR-THRO: Insecta) The dorsal sclerite of the metathorax. metanotal a.

metaparapteron n. [Gr. meta, after; para, beside; pteron, wing] (ARTHRO: Insecta) In Formicidae, the postscutellum.

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