spicule

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spicule A small needle or spine, or a small, spiky, skeletal element. In Porifera (sponges), spicules form a skeletal framework supporting the soft, cellular mass. They exist in a variety of forms and are important in the identification and classification of species. An extensive nomenclature has developed through the use of these structures in poriferan taxonomy (e.g. they may be described as monoaxon, tetraxon, triaxon, hexaxon, polyaxon, megasclere, or microsclere). Spicules may be calcareous, siliceous, or of a fibrous material (spongin).

spicule

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spicule (spik-yool) n. a small splinter of bone.

spicule

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spicule A small needle or spine.

spicule

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spicule A small needle or spine.

spicule

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spicule A small needle or spine.

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