Cycloid Scale

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cycloid scale [′sī‚klȯid ‚skāl]

(vertebrate zoology)

A thin, acellular structure which is composed of a bonelike substance and shows annual growth rings; found in the skin of soft-rayed fishes.

Cycloid Scale

in teleost fishes (Salmonoidei, Clupeiformes, Cypriniformes, and others), a scale having a smooth, rounded margin. Each scale lies in a deep pocket of connective tissue and overlaps its neighbor. Cycloid scales consist of two layers of non-cellular bony tissue: homogeneous tegumentary tissue and fibrous basal tissue. The tegumentary layer proliferates along the periphery in concentric stripes known as sclerites. The periodicity of sclerite formation, shown by annual rings, makes it possible to determine the age and growth rate of the fish. Radial nutrient ducts, which in Osteoglossidae form a complex alveolar structure, depart from the center of the scale.

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No references found			Scales small for the genus, progressively smaller anteriorly, extending on side of nape to above middle of opercle, but none in median predorsal zone or prepectoral area (if embedded scales are present in these two apparently naked areas, none could be dislodged); scales ctenoid posteriorly on body, becoming cycloid anterior to origin of second dorsal fin; small cycloid scales present on chest; no scales on fins except basal fourth to fifth of caudal fin. Amblyeleotris neumanni, a new species of shrimp goby from New Britain by Randall, John E.; Earle, John L. / Aqua: journal of ichthyology & aquatic biology			cycloate cyclobarbital cyclobutadiene Cyclobutane cyclobutene cycloconverter Cyclocystoidea cyclodextrin cyclodialysis cyclodiathermy cyclodiolefin cyclododecatriene cycloelimination cyclogenesis cyclograph Cyclography cycloheptaamylose cyclohexaamylose Cyclohexane Cyclohexanol Cyclohexanone cyclohexene cycloheximide cyclohexylamine cycloid Cycloid Scale cycloidal arch cycloidal gear teeth Cycloidal Gearing cycloidal mass spectrometer Cycloidal Pendulum cycloidal propeller cycloidal wave cyclolysis cyclomatic complexity cyclomatic number cyclometer Cyclomorphosis Cyclomyaria Cyclone cyclone cellar cyclone classifier cyclone collector cyclone family cyclone furnace cyclone separator cyclone wave Cyclone, Tropical cyclonic cyclonic scale cyclonic shear			cyclohexane dimethanol divinyl ether Cyclohexanedimethanol Cyclohexanes Cyclohexanes cyclohexanol cyclohexanol cyclohexanol phthalate Cyclohexanols Cyclohexanols Cyclohexanone Cyclohexanone Cyclohexanones Cyclohexanones Cyclohexatriene Cyclohexatriene Cyclohexatriene Cyclohexene cycloheximide cycloheximide cycloheximide cycloheximide Cyclohexyl Cyclohexyl Cyclohexyl amine Cyclohexyl Methacrylate Cyclohexylamine cyclohexylamines cycloid cycloid cycloid Cycloid Scale cycloidal cycloidal cycloidal cycloidal arch Cycloidal engine cycloidal gear teeth Cycloidal Gearing cycloidal mass spectrometer cycloidal pendulum Cycloidal propeller cycloidal wave Cycloidei Cycloidian cycloids cycloids cycloids Cyclokapron Cyclokapron cyclokeratitis Cycloleucine Cycloloma Cycloloma atriplicifolium cyclolysis Cyclomatic complexity Cyclomatic Number Cyclomen Cyclomen Cyclomen cyclometer cyclometer

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