Mesopseudogyne see pseudogyne

mesorhabdions [Gr. mesos, middle; dim. rhabdos, rod] (nemata) The walls of the mesostome. see rhabdion.

mesoscutellum n. [Gr. mesos, middle; L. scutellum, little shield] (ARTHRO: Insecta) The scutellum of the mesothorax, usually referred to as scutellum.

mesoscutum n. [Gr. mesos, middle; L. scutum, shield] (ARTHRO: Insecta) The scutum of the mesothorax.

mesoseries n. [Gr. mesos, middle; L. series, row] (ARTHRO: Insecta) In larva, a band of crochets or hooks extending longitudinally on the mesal side of a proleg; when curved, varying from a quadrant to slightly more than a semicircle in extent, seldom exceeding two-thirds of a circle.

mesosoma n. [Gr. mesos, middle; soma, body] 1. The middle part of an invertebrate's body. 2. (ARTHRO: Chelicerata) In Arachnida, the anterior portion of the abdomen, often clearly set off from the metasoma. 3. (ARTHRO: Insecta) For Hymenoptera, see alitrunk. 4. (POGON) The short frenular region of the body.

mesosome n. [Gr. mesos, middle; soma, body] (ARTHRO: Crustacea) A collective term for all free thoracic somites behind the head.

mesospermalege n. [Gr. mesos, middle; sperma, seed; L. legere, to gather] (ARTHRO: Insecta) A special pouch in certain females for reception of sperm; Ribaga's or Ber-lese's organ.

mesosternal cavity (ARTHRO: Insecta) In Elateridae, the opening into which the prosternal process catches.

mesosternellum n. [Gr. mesos, middle; L. dim. sternum, breast bone] (ARTHRO: Insecta) A small rod-like plate that articulates posteriorly with the mesosternum.

mesosternum n. [Gr. mesos, middle; sternon, breast] 1. (ARTHRO: Crustacea) In some Decapoda Brachyura, the median plate of the sternum. 2. (ARTHRO: Insecta) In Hymenoptera, the ventral part of the mesothorax; between the fore and mid-coxae.

mesostome, mesostom n. [Gr. mesos, middle; stoma, mouth] (NEMATA) A division of the protostome preceded anteriorly by the prostome and posteriorly by the metas-tome. see prostome.

mesostracum n. [Gr. mesos, middle; ostrakon, shell] (MOLL: Polyplacorphora) A calcareous shell layer between the teg-

mentum and the articulamentum in certain more highly developed living species.

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