Masticatory stomach see gastric mill

masticomorphic a. [L. mastecare, to chew; Gr. morphos, form] Designed for chewing.

mastidia; sing. mastidion [Gr. mastos, breast] (ARTHRO: Chelicerata) Small, conical, nipple-like tubercles on the front of the chelicerae of small spiders.

mastigobranch, mastigobranchia n. [Gr. mastix, whip; branchos, gill] (ARTHRO: Crustacea) A slender respiratory process at the base of the epipod.

mastigophore n. [Gr. mastix, whip; pherein, to bear] (CNID: Anthozoa) A nematocyst with a cylindrical hempe and tube extending beyond the hempe; microbasic with hempe not more than 3 times the capsule length; macrobasic with hempe 4 or more times the capsule length.

mastigopus larva (ARTHRO: Crustacea) Larva in the megalopa stage found among some Decapoda.

maternal inheritance Inheritance controlled by maternal extra chromosomal determinants.

maternal zooid (BRYO: Gymnolaemata) An autozooid that extrudes eggs.

mating plug (ARTHRO: Insecta) A plug formed from the accessory gland secretions of the male, deposited in the genital chamber of the female, thought to prevent loss of sperm in some Culicidae and Lepidoptera; also called spermato-phragma. see sphragis.

mating spines (ARTHRO: Insecta) In female mayflies, compound conical spines covering the lower surface of the egg valve.

matricidal hatching (NEMATA) Intrauterine larval development leading to the destruction of the female by the larvae or juveniles; eclosion intrauterine.

matrifilial a. [L. mater, mother; filia, daughter] (ARTHRO: In-secta) In Apis, having colonies made up of mothers and daughters.

matrix n.; pl. matrices [L. mater, mother] 1. That which gives form, origin or foundation to something enclosed or embedded in it. 2. (nemata: Secernentea) The gelatinous substance secreted by some female nematodes into which eggs are deposited to form an egg mass. 3. (platy) In Cestoda and Trematoda, a living interface of interacting photoplasmic layer; part of the syncytium of the tegument. 4. (PORIF) The non-cellular ground material of a sponge in which the cellular elements are dispersed.

matrix glands (NEMATA: Secernentea) An excretory cell or modified rectal glands that secrete the gelatinous matrix through the anus or excretory pore and into which eggs maybe imbedded.

matrix layer (NEMATA) Historically, a cuticular stratum of spongy material between the fibrillar layer and the boundary layer.

matrone n. [L. mater, mother] (ARTHRO: Insecta) Macromo-lecular components (proteins) contained in the seminal fluid of some male Culicidae that inhibits further insemination of the female.

maturation n. [L. maturus, ripe] The act or process pertaining to the developmental steps leading to reproducing adults.

maturation divisions A series of nuclear divisions in the formation of the gametes in which the chromosome number, through meiosis is reduced from diploid to haploid.

maturation feeding (ARTHRO: Insecta) Feeding required by some insects before their gonads can mature to produce eggs.

maturation zone In males of many invertebrates, that part of the genital follicle below the germarium in which each spermatocyte undergoes the two meiotic divisions to produce spermatids. see transformation zones.

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