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Comprehensive Description

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Description of Amphisteginidae

Asterigerinid foraminifera, test lenticular, biconvex, may be bi-involute or partially evolute on spiral side, with distinctive umbilical plug; internal toothplate dividing almost completely each chamber, producing an irregular stellate pattern on the umbilical side; aperture an umbilical slit bordered by a lip; surface smooth except for the apertural region covered with fine papillae.

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