Metatergum see metanotum

metathetely n. [Gr. meta, after; theein, to run; telos, end] (ARTHRO) 1. A neotenous adult arthropod after undergoing normal or more than normal numbers of molts. 2. In Insecta, often resulting in failure to develop wings, or forming brachypterous adults.

metathoracotheca n. [Gr. meta, after; thorax, chest; theke, case] (ARTHRO: Insecta) The pupal covering of the metathorax.

metathorax n. [Gr. meta, after; thorax, chest] (ARTHRO: Insecta) The third or posterior segment of the thorax, bearing the hind legs and the hind wings.

metatroch n. [Gr. meta, after; trochos, wheel] (ANN) In Poly-chaeta, trochophore larvae, as well as some other groups, the postoral girdle of cilia. see prototroch, telotroch.

metatrochophore n. [Gr. meta, after; trochos, wheel; phorein, to bear] (ANN: Polychaeta) A ciliated trochophore larva developing trunk segments.

metaxyphus n. [Gr. meta, after; xiphos, sword] (ARTHRO: In-

secta) In Hemiptera, spinose or triangular process of the metasternum.

Metazoa, metazoans n.; n.pl. [Gr. meta, after; zoon, animal] 1. A small phylum of endoparasitic, ciliated, multicellular organisms composed of two layers, lacking skeletal, muscular, nervous, digestive, respiratory or excretory elements. 2. Often regarded as degenerate flatworms appended to phylum Platyhelminthes. metazoic a.

metazoea n. [Gr. meta, after; zoe, life] (ARTHRO: Crustacea) A late zoeal stage in Anomura and Brachyura with simple uniramous limbs on posterior thoracomeres, budding pleo-pods 1-5 at the same time, and having stalked eyes.

metazona n. [Gr. meta, after; zone, belt] (ARTHRO: Insecta) The posterior part of the pronotum. see prozona.

metazonite n. [Gr. meta, after; zone, belt] (ARTHRO: Diplo-poda)The posterior portion of a diplosomite, divided by a transverse groove. see prozonite.

metecdysis n. [Gr. meta, after; ekdysis, molt] (ARTHRO) The period following a molt before the new cuticle hardens, especially in Decapoda (Crustacea).

metelattosis n. [Gr. meta, after; elatton, smaller] (ARTHRO: Chelicerata) Regression of postembryonic development, initiated after the beginning stasis.

metenchium n. [L. meta, conical column; Gr. enchos, spear] (NEMATA: Secernentea) Conus of the stylet in plant parasites in the order Tylenchida. see telenchium.

metenteron n. [Gr. meta, after; enteron, intestine] (CNID) The radial digestive chamber. see mesenteron.

metepimeron n.; pl. -mera [Gr. meta, after; epi, on; meros, part] (ARTHRO: Insecta) The epimeron of the metathorax.

metepisternum n.; pl. -sterna [Gr. meta, after; epi, on; ster-non, breast] (ARTHRO: Insecta) 1. The episternum of the metathorax. 2. In Culicidae, behind and below the metathoracic spiracle.

meter n. [Gr. metron, a measure] A measure of length in the metric system; 39.37 inches. see centimeter, millimeter.

metinfraepisternum n. [Gr. meta, after; L. infra, underneath;

Gr. epi, on; sternon, breast] (ARTHRO: Insecta) In Odonata, a ventral subdivision of the metepisternum.

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