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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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854Maggenti and Gardnernarrow host range.steppe n. [Russ. step', lowland] Short grass plains, generallytreeless.stercoral a. [L. stercus, dung] 1. Pertaining to excrement. 2.Living in or feeding on dung.stercoral pocket (ARTHRO: Chelicerata) A dilated portion <strong>of</strong>the proctodeum <strong>of</strong> certain spiders in which fecal matter andexcreta temporarily accumulate.stereoblastula n. [Gr. stereos, solid; blastos, bud] An early,solid blastula larva, all <strong>of</strong> whose cells reach the externalsurface.stereogastrula n. [Gr. stereos, solid; gaster, stomach] A generalterm for solid metazoan larvae.stereoisomer n. [Gr. stereos, solid; isos, equal; meros, part]Different three-dimensional configurations <strong>of</strong> organic moleculesthat have different light rotational properties.stereokinesis n. [Gr. stereos, solid; kinesis, movement] A reflexsensitivity inhibition due to passive contact stimuli;thigmotaxis.stereom(e) n. [Gr. stereos, solid] 1. The rigid material <strong>of</strong> theinvertebrate skeleton. 2. (BRYO: Stenolaemata) The extrazooidalskeletal deposits, additions to structural skeleton,or to the vesicle ro<strong>of</strong> skeleton.stereotaxis n.; pl. -taxes [Gr. stereos, solid; taxis, arrangement]The directive response <strong>of</strong> an organism to contactwith solids; thigmotaxis. a. Positive stereotaxis: toward thecontact. b. Negative stereotaxis: away from the contact.stereotactic a.stereotropism n. [Gr. stereos, solid; tropos, turn] A movementin direction determined by contact with a solid body.a. Positive stereotropism: toward contact. b. Negativestereotropism: away from contact. stereotropic a.sterile a. [L. sterilis, unfruitful] Incapable <strong>of</strong> producing viablegametes.sterilization n. [L. sterilis, unfruitful] 1. Rendering an animalincapable <strong>of</strong> reproduction. 2. Rendering a substrate free <strong>of</strong>organisms.

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