Miliolida
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The Miliolida are an order of foraminifera with calcareous, porcelacous tests that are imperforate and commonly have a pseudochitinous lining. Tests are composed of randomly oriented calcite needles t
Test (biology)
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In biology, a test is the hard shell of some spherical aquatic animals and protists, notably sea urchins and microorganisms such as testate foraminiferans, radiolarians, and testate amoebae. The term
Test of a shingle urchin (Colobocentrotus atratus)
Test of a sea urchin.
Sea urchin test detail. External plates made of carbonate, silica, and chitin create a dense protective layer that is often covered in serrations, ridges and spines.
Foraminiferan tests.