White sea urchin, polarised microscopy

White sea urchin, polarised microscopy

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Caption: Polarised light micrograph of a white 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. Magnification: x68 at 10cm size.

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Keywords: anatomical, anatomy, animal, biological, biology, calcium carbonate, cross section, echinoderm, fauna, gracilechinus actus, light microscope, microscopic, microscopy, nature, polarised light micrograph, polarized, spine, symmetry, white sea urchin, zoological, zoology

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