white cuticle (ARTHRO: Insecta) The inner thick, tough, laminated endocuticle of an egg membrane secreted by the serosa, and containing chitin. see yellow cuticle.
wholemount An intact specimen prepared for examination.
whorl n. [A.S. hweorfan, to turn] (MOLL: Gastropoda) 1. Any complete coil of a helicocone. 2. The exposed surface of any complete coil of a helicocone.
width n. [A.S. wid, broad] (MOLL) The maximum dimension measured at right angles to the length or height of a shell.
wild type A strain, organism, or gene of the type predominating in nature; natural.
wing n. [ME. winge, wing] 1. (ARTHRO) One of paired, thin, membranous reticulated organs of flight. 2. (MOLL) A projection, flattened, expansion, or earlike extension of a hinge line; auricle. see ala.
winter egg Resting egg; where applicable, a type of egg with a thick shell that protects the egg over winter; opsiblastic. see summer egg.
With's organs (ARTHRO: Chelicerata) In Acari, paralabial hy-pertrophied setae mediad from the rutella.
workers n.pl. [A.S. worc, work] (ARTHRO) 1. An individual of the semisocial and eusocial Hymenoptera, nonreproductive, laboring caste. 2. In Isoptera, individuals which lack wings and possess reduced pterothorax, eyes and genital apparatus. 3. In Formicidae, the ordinary sterile female, bearing reduced ovarioles and simplified thorax; includes both minor workers and soldiers in species with two subcastes.
worker jelly (ARTHRO: Insecta) In Apis, food given to larvae that causes them to become workers; bee milk.
xanthic a. [Gr. xanthos, yellow] Yellowish in color.
xanthophyll n. [Gr. xanthos, yellow; phyllon, leaf] An oxidised derivative of carotene found in the blood of some plant eating insects.
xanthopterin, xanthopterine (ARTHRO: Insecta) A yellow pteridine pigment of some insects.
X-chromosomes In most dioecious diploid organisms, sex chromosomes of which there are a pair in the female, but only one in the male.
xenagones n.pl. [Gr. xenos, guest; agein, to lead] Substances produced by parasites that act upon the host.
xenic a. [Gr. xenos, guest] The rearing of individuals of one species together with an unknown number of species of other organisms. see axenic, polyxenic, synxenic, trix-enic.
xenobiosis n. [Gr. xenos, guest; bios, life] (ARTHRO: Insecta) A form of relation in which one species lives in and among the nests of another species, obtaining food from them by regurgitation or other means, but keeping their own brood separate.
xenoecic a. [Gr. xenos, guest; oikos, house] Living in an abandoned shell of an unrelated species.
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