Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology 903theory of probabilities A mathematical theory used by taxonomists,whereby they assume that no two individuals willsimultaneously have the same combination of characters asthose of a given species; in mathematics, the theory ofchance.thermocline n. [Gr. therme, heat; klinein, to slope] In thestrata of rapidly changing temperatures in lakes, the narrowdividing stratum between the epilimnion andhypolimnion.thermophile n. [Gr. therme, heat; philos, loving] Living athigh temperatures; hot springs fauna.thermophobe n. [Gr. therme, heat; phobos, hate] An organismthat lives at low tempertures.thermoreceptor n. [Gr. therme, heat; L. recipere, to receive]A sensory receptor that reacts to temperature stimuli.thermotaxis n. [Gr. therme, heat; taxis, arrangement] A taxisin which heat is the response initiating stimulus; regulationof body temperature.thesocytes n.pl. [Gr. thesis, deposit; kytos container] (PORIF)In hibernating fresh water sponge gemmules, binucleate,highly vitelline archaeocytes.thickener cells (PORIF) Cells influencing ray thickness duringsecretion of calcareous spicules.thickness n. [A.S. thicce, thick] (MOLL: Bivalvia) 1. See inflation.2. Measurement from the inner to outer shell surface.thigmotaxis n.; pl. taxes [Gr. thigma, touch; taxis, arrangement]The taxis of contact; stereotaxis. a. Positive thigmotaxis:toward the contact. b. Negative thigmotaxis:away from the contact. thigmotactic a.thigmotropism n. [Gr. thigma, touch; tropos, turn] Tropism inwhich direction is determined by contact with a solid body;stereotropism.third axillary (ARTHRO: Insecta) A Y-shaped sclerite of thewing, with a flexor muscle inserted into the crotch of the Yand usually articulating with the posterior notal processand a group of anal veins.third-form reproductive (ARTHRO: Insecta) In Isoptera, an