Mesotergum see mesonotum

mesothoracotheca n. [Gr. mesos, middle; thorax, chest; theke, case) (ARTHRO: Insecta) In pupal forms, the covering of the mesothorax.

mesothorax n. [Gr. mesos, middle; thorax, chest] (ARTHRO: Insecta) The middle of the thoracic divisions.

mesothyridid n. [Gr. mesos, middle; thyridos, a window] (BRACHIO) Pedicle opening partly in the ventral umbo and partly in the delthyrium, with beak ridges appearing to bisect the opening.

mesotriaene n. [Gr. mesos, middle; triaina, trident] (PORIF) A megasclere triaene with a rhabd projecting on both sides of a cladome.

mesotroch n. [Gr. mesos, middle; trochos, wheel] (ANN: Poly-chaeta) A ciliated band around the midbody of a marine annelid.

Mesozoa, mesozoans n.; n.pl. [Gr. mesos, middle; zoon, animal] Ciliated, multicellular organisms, endoparasitic in a variety of marine invertebrates; two layered, having no skeletal, muscular, nervous, digestive, respiratory, or excretory elements.

mesozona n. [Gr. mesos, middle; zone, belt] (ARTHRO: Insecta) The middle portion of the pronotum. see prozona.

metabiosis n. [Gr. meta, between; bios, life] A condition of life where an organism precedes and prepares the environment for another organism, inducing an exchange of growth factors beneficial among species.

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