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Test attached, proloculus followed by cornuspirine coil in early stage, later whorls with few chambers and may tend to uncoil, depending on the nature of the substrate, final stage may grow free of the attachment; wall calcareous, imperforate, and commonly incorporates a small amount of foreign material; aperture an elongate slit against the attachment, becoming rounded with toothlike infoldings of the rim when the final chamber grows free. Jurassic to Holocene; cosmopolitan.