Sea urchin spine, polarised microscopy

Sea urchin spine, polarised microscopy

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Caption: Polarised light micrograph of a spine of a sea urchin (Echinus sp.). 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.

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

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