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.
| Semirosalina Temporal range: Lower/Early Miocene
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| Genus: | Semirosalina Hornibrook. 1961
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Semirosalina differs from Rosalina in being smaller in size, having fewer chambers, and an inflated rather than a flattened test.
References
edit- Alfred R. Loeblich Jr & Helen Tappan, 1988. Forminiferal Genera and their classification. Geological Survey of Iran, (e-book) 2005. [1]