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Semirosalina

Semirosalina is a genus of foraminifera from the Lower Miocene of New Zealand, related to Rosalina, included in discorbacean family Rosalinidae. The test is a small trochospiral coil of few whorls with a few subglobular chambers per whorl. The test wall is thin and finely perforate. The aperture at the umbilical margin of the apertural face.
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