Mesial sclerite see labellar mesial sclerite

mesic a. [Gr. mesos, middle] Climate characterized by a moderate amount of water.

mesinfraepisternum n. [Gr. mesos, middle; L. infra, below; Gr. epi, on; sternon, chest] (ARTHRO: Insecta) A ventral subdivision of the mesepisternum.

meskatepimeron n. [Gr. mesos, middle; kata, inferior; epi, on; meros, part] (ARTHRO: Insecta) The lower division of the mesepimeron.

meskatepisternum n. [Gr. mesos, middle; kata, inferior; epi, on; sternon, chest] (ARTHRO: Insecta) In Diptera, the lower area of the mesepisternum.

mesobasisternum n. [Gr. mesos, middle; basis, bottom; ster-non, chest] (ARTHRO: Insecta) 1. The basisternum of the mesothorax. 2. In Diptera, maybe separated from the mesofurcasternum by a secondary line of inflection. see furcasternum.

mesobiota n. [Gr. mesos, middle; bios, life] Organisms in the soil ranging in size from nematodes to microannelids, mi-croarthropods and mites; mesofauna.

mesoblast n. [Gr. mesos, middle; blastos, bud] Embryonic mesoderm; the middle germ layer. mesoblastic a.

mesoblastic somites Segmental divisions of embryonic mesoderm.

mesobranchial lobe or area (ARTHRO: Crustacea) In Deca-poda, an intermediate part of the branchial region of the carapace.

mesocardiac ossicle (ARTHRO: Crustacea) In Decapoda, a triangular or oblong plate, the apex pointing forward maybe more or less truncated; forming the keystone of the anterior arch of the gastric mill.

mesocephalic a. [Gr. mesos, middle; kephale, head] Having a medium size head.

mesocephalic pillars (ARTHRO: Insecta) In bees, two oblique chitinous bars forming a brace between the anterior and posterior walls of the head.

mesocercaria n. [Gr. mesos, middle; kerkos, tail] (PLATY: Trematoda) A juvenile stage occurring in digenetic trematodes, an unencysted stage between the cercaria and the metacercaria.

mesocerebrum n. [Gr. mesos, middle; L. cerebrum, brain] (ARTHRO: Crustacea) Ganglion of antennular somite; deu-terocerebrum.

mesocoel n. [Gr. mesos, middle; koilos, hollow] 1. The body cavity of the second division of the deuterostome body. 2. (bryo) Assumed to be the cavity within and at the base of the tentacles. 3. (moll) Second or middle division of the coelom.

mesocole a. [Gr. mesos, middle; L. colere, to inhabit] Living conditions with neither too much nor too little water.

mesoconch n. [Gr. mesos, middle; konche, shell] (MOLL: Bi-valvia) An intermediate stage in formation of the disso-conch; separated from other stages by pronounced discontinuities.

mesocuticle n. [Gr. mesos, middle; L. cutis, skin] A layer with distinctive staining properties between the exocuticle and endocuticle.

mesoderm n. [Gr. mesos, middle; derma, skin] The cell layer between ectoderm and endoderm in the embryonic cells of all animals above the Cnidaria.

mesodermal tube The dorsal blood vessel; heart.

mesodont a. [Gr. mesos, middle; odous, tooth] (ARTHRO: In-secta) Pertaining to male Lucanidae bearing mandibles intermediate in size; amphiodont. see teleodont, priodont.

meso-epinotal suture (ARTHRO: Insecta) In Formicidae, the transverse seam separating the mesonotum from the epi-notum.

mesoepisternum see mesepisternum mesofacial plate see face mesofauna see mesobiota mesofurca see furca mesogastric lobe/area (ARTHRO: Crustacea) In Decapoda, the medial division of the gastric region of the carapace; usually five-sided in outline with a long narrow forward projection.

mesogloea n. [Gr. mesos, middle; gloios, glutinous] A thin to very thick, acellular to rather cellular, gelatinous connective tissue between the inner and the outer layers of a two-layered animal.

mesohyl n. [Gr. mesos, middle; hyle, matter] (PORIF) The space lying between the pinacoderm and the choanoderm.

mesolamella n. [Gr. mesos, middle; L. dim. lamina, layer] A thin mesogloeal layer between epidermis and gastrodermis in Cnidaria and Porifera.

mesolecithal egg Eggs with moderate yolk content. see cen-trolecithal egg.

mesology see ecology mesomere n. [Gr. mesos, middle; meros, part] 1. A blas-tomere of medium size. 2. A mesoblastic somite. 3. Central zone of coelomic pouches in an embryo. 4. (ARTHRO: Insecta) The inner divisions of the phallic lobes that unite to form the aedeagus (the intromittent organ).

mesomerites n.pl. [Gr. mesos, middle; meros, part; -ites, having nature of] (ARTHRO: Diplopoda) Modified 9 pair of limbs; together with 8 pair (promerites) of limbs function ing as pincers to pull out female vulvae.

mesomeron n. [Gr. mesos, middle; meros, thigh] (ARTHRO: Insecta) In Diptera, the meron of the mesothorax behind the midcoxa below the mesepimeron. see metameron, meron.

meson n. [Gr. mesos, middle] The central plane; the midline of the body; an imaginary plane dividing the body into right and left halves; the saggital plane.

mesonephridium n. [Gr. mesos, middle; nephros, kidney] Nephridium of mesodermal origin.

mesonotum n. [Gr. mesos, middle; notos, back] (ARTHRO: Insecta) The back or upper side of the mesothorax.

mesopelagic a. [Gr. mesos, middle; pelagos, sea] Pertaining to the pelagic zone of intermediate depth of 200-1000 m; between the epipelagic and bathypelagic zones.

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