Definitionn. small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals
Last update: September 28, 2015
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Most commonly the spicule-forming cells pass out of the ectoderm and are imbedded in the mesogloea, where they may remain separate from one another or may be fused together to form a strong mass. [Please select]
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Specimens from Bondad have a V-shaped interpterygoid space and in it a small median spicule. [Please select]
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Each spicule, although it is formed mainly of hydrated silica (opal), contains a slender organic filament running along its main axis inside the silica. [Please select]
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2); interpterygoid space U-shaped, with median spicule; basioccipital wide; bullae well inflated, rounded ventrally. [Please select]
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6); bullae pointed ventrally; interpterygoid space V-shaped, lacking a median spicule; basioccipital narrow. [Please select]
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E=three stages in the development of a gemmule-spicule of _E. [Please select]
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_a_, Skeleton-spicules; _b_, gemmule-spicules; _b'_, a single gemmule-spicule more highly magnified.' [Please select]
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--A=skeleton-spicule of _Trochospongilla latouchiana_; A'=gemmule-spicule of the same species; B=gemmule of _T.' [Please select]
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The spicule thus resembles a little trumpet resting on its mouth. [Please select]
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Upper parts light ochraceous-buffy; tail pale brownish with less sharply contrasted white tip; interparietal narrower, reduced to mere spicule between mastoids (range in Arizona mainly southwestern part) =Dipodomys deserti. [Please select]
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1) and are characterized by a yellowish color; nasals posteriorly truncate or rounded; posterior extensions of premaxillae long; basioccipital wide; and interpterygoid space U-shaped with a median spicule. [Please select]
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