Sea urchin, polarised light micrograph

Sea urchin, polarised light micrograph

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Caption: Polarised light micrograph of a sea urchin (Gracilechinus acutus). The test and spines of sea urchins are composed of calcium carbonate. Each spine articulates with a tubercle on the test. The elaborate structure of the spines when seen in cross section has made them a popular subject for microscopists. Horizontal object size: 2.0 mm.

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Keywords: animal, biological, biology, calcium carbonate, cross section, echinoderm, fauna, gracilechinus actus, light microscope, lm, microscopic, microscopy, nature, polarised light micrograph, polarized, sea urchin, spine, thin section, wildlife, zoological, zoology

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