Meronephridium see micronephridia

meropleuron n.; pl. -ura [Gr. meros, part; pleuron, side] (ARTHRO: Insecta) A sclerite composed of the meron of the coxa and the lower region of the epimeron.

meropodite n. [Gr. meros, part; pous foot] (ARTHRO) 1. The fourth segment of a generalized limb. 2. The femur in Che-licerata and Insecta. 3. For Crustacea see merus.

merosome n. [Gr. meros, part; soma, body] A body segment; a somite or metamere.

merospermy n. [Gr. meros, part; sperma, seed] Fusion of an egg cell with a sperm that has lost its nucleus; therefore, it cannot take part in karyogamy with the egg nucleus.

merus n. [Gr. meros, part] (ARTHRO: Crustacea) The fourth segment of the mouth part, articulating with the ischium anteriorly and carpus posteriorly; a meropodite.

mesad, mesiad adv. [Gr. mesos, middle; ad, toward] Toward the midline of the body.

mesadenia; sing. mesadene [Gr. mesos, middle; aden, gland] (ARTHRO: Insecta) 1. Mesodermal accessory glands of male genitalia. 2. In some male Heteroptera, paired, highly coiled tubules that run side by side to enter anteriorly the bulbus ejaculatorius or closely associated with the short vasa deferentia.

mesal, mesial a. [Gr. mesos, middle] At or near the midline of the body.

mesal penellipse (ARTHRO: Insecta) In larvae, a series of crochets covering at least the mesal half of the proleg, incomplete laterally. see penellipse.

mesanapleural suture (ARTHRO: Insecta) In Diptera, a suture between the mesanepisternum and the meskatepisternum.

mesanepisternum n. [Gr. mesos, middle; ana, up; epi, on; sternon, chest] (ARTHRO: Insecta) 1. In Diptera, the upper area of the mesepisternum separated from the meskatepisternum by the mesanapleural suture; sometimes divided into anterior and posterior by anepisternal cleft; the anepisternum. 2. In Odonata, the anepisternum.

mesaxon n. [Gr. mesos, middle; axon, axel] (ARTHRO: Insecta) The spiral arrangement of a Schwann cell around an axon; suspensory fold.

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