stratification n. [L. stratum, a cover; ficare, to make] Act or process of being made up of layers.
stratum n.; pl. -ta [L. stratum, a cover] 1. A layer of tissue or cells that compose an organ. 2. A group of organisms inhabiting a particular geographical area. 3. A layer of vegetation, usually at the same stage of development. 4. A layer of sedimentary rock or earth.
strepsilaematous a. [Gr. strepsis, twisting; laimos, throat] Having a pharynx rotated along its length. see euthylae-matous.
streptasters n.pl. [Gr. strepsis, twisting; aster, star] (PORIF) Short, spiny, microscleric monaxon spicules.
streptoneury n. [Gr. strepsis, twisting; neuron, nerve] (MOLL:
Gastropoda) Equivalent to chiastoneury.
stria n.; pl. striae [L. stria, furrow] A groove or depressed line. striate a.
striation n. [L. stria, furrow] A longitudinal ridge or furrow.
stricture n. [L. stringere, to bind tight] A binding or contraction, as of a passage in a body.
stridulating organs The impact of some part of the body against the substratum; friction method, rubbing two parts of the body together; vibrating membrane; sound produced by a pulsed air stream.
stridulation n. [L. stridere, to make a creaking or grating noise] Any sound produced by a lower animal.
stridulatory a. [L. stridere, to make a creaking or grating noise] Pertaining to or the nature of stridulation.
striga n.; pl. strigae [L. striga, furrow] A narrow, transverse line or streak.
strigate a. [L. striga, furrow] Marked with fine, closely set grooves.
strigil n. [L. strigilis, scraper] (ARTHRO: Insecta) 1. A curved structure at the apex of the fore tibia of many insects that functions as a scraper, a tibial comb or antenna cleaner. 2. In some Hemiptera, a currycomb-like structure situated on the dorsal surface of the abdomen.
strigilation n. [L. strigilis, scraper] (ARTHRO: Insecta) In Hy-menoptera, licking secretions from the body of another animal.
strigilator n. [L. strigilis, scraper] One who licks the surface of another to collect secretions from the body.
strigose a. [L. striga, furrow] Covered with strigae; marked with fine, closely set grooves.
strigose ventral areas (ARTHRO: Insecta) In Hemiptera, the inner side of the hind tibiae containing wart-like tubercles, each bearing a subapical tooth; rubbing against the femur produces an audible sound.
strigula n.; pl. -ulae [L. striga, furrow] A fine, short transverse mark or line.
strike n. [OE. strican, to stroke, level out] (ARTHRO: Insecta) The deposition of Diptera eggs or larvae on a living host.
string reef (MOLL: Bivalvia) Oysters crowded into a long, narrow accumulation.
striola a. [L. dim. stria, furrow] Finely impressed parallel lines.
stripe n. [MD. strijp, stripe] A longitudinal color marking.
strobila n.; pl. -lae [Gr. strobilos, anything twisted, pine cone] 1. An organism, or stage of an organism, from which successive annular disc embryos bud off. 2. (CNID: Scyphozoa) A scyphistoma larva of a jellyfish consisting of ephyrae. 3. (PLATY: Cestoda) A tapeworm, consisting of scolex, 'neck', immature, mature and usually gravid proglottids.
strobilation, strobilization n. [Gr. strobilos, anything twisted, pine cone] 1. The formation of a chain of body segmentation into zooids. 2. (CNID: Scyphozoa) The ephyrae of jellyfish. see monodisk, polydisk. 3. (PLATY: Cestoda) The proglottids.
strobilocercoid n. [Gr. strobilos, anything twisted, pine cone; kerkos, tail; eidos, like] (PLATY: Cestoda) In Schistotaenia , a cysticercoid that undergoes some strobilation.
strobilocercus n. [Gr. strobilos, anything twisted, pine cone; kerkos, tail] (PLATY: Cestoda) A simple cysticercus with evidence of strobilation.
stroma n.; pl. stromata [Gr. stroma, bed] Connective tissue framework of an organ.
strombiform a. [Gr. strombos, a top, a spiral shell; L. forma, shape] (MOLL: Gastropoda) Roughly biconical, with expanded outer lip; said of the shell of Strombus .
stromboid notch (MOLL: Gastropoda) In Strombus , a curve or notch in the outer lip, above the anterior notch.
strongylaster n. [Gr. strongylos, rounded; aster, star] (PORIF) A star-shaped spicule with small center and rays with rounded edges.
strongyle n. [Gr. strongylos, rounded] 1. (NEMATA: Se-cernentea) A common name for the order Strongylida. 2. (PORIF) A diactinal monaxon (spicule) rounded at both ends.
strongyloxea n. [Gr. strongylos, rounded; oxys, sharp] (PO-RIF) A monactinal megasclere with one end rounded and the other pointed.
strophe n. [Gr. strophos, twisted] (ARTHRO: Insecta) In males of higher Diptera, spiral curling of parts of the postabdomen into a protected position at rest.
structural colors Colors resulting from structure rather than pigment.
structural gene Any gene that determines the structure of a polypeptide through the production of messenger RNA.
structure n. [L. structus, build] Any organ, appendage or part of an organism.
struma n.; pl. -ae [L. struma, scrofulous tumor] (ARTHRO: In-secta) In most Coccinellidae larvae, distinct tubercles of the body wall bearing spines. strumose a.
stupeous a. [L. stupa, coarse fiber of flax or hemp, tow] Covered with fiber-like filaments.
stupulose a. [L. stupa, coarse fiber of flax or hemp, tow] Covered with coarse decumbent hairs.
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