Fossilised Sponge Spicule #4
by Science Photo Library
Title
Fossilised Sponge Spicule #4
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
Coloured scanning electron micrograph (SEM) of a fossilised marine sponge spicule from Oamaru, New Zealand. 3-D star shape. Sponge spicules are found in most sponges. They act as the structural support of sponges and deter predators. Spicules can be found in a wide range of symmetry types. They can be made of calcium carbonate, silica dioxide or spongin. Spicules are formed by sclerocytes, which are derived from archaeocytes. There are 4 main types of spicules: monaxons, triaxons, tetraxons and dendroclones. Magnification: x2,200 when shortest axis printed at 25 millimetres.
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October 4th, 2018
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