''Rosalina'' is a genus of foraminifera included in the rotaliid family Rosalinidae. ''Rosalina'' has a smooth plano-convex to concavo-convex trochospiral test in which the chambers are rapidly enlarging and all visible on the convex spiral side and subtriangular and strongly overlapping on the umbilical side, the final chamber taking up about one-third of the circumference. Sutures on the spiral side are depressed and oblique, curving back at the periphery. The umbilicus is open, partly covered by triangular umbilical flaps extending from each chamber of the final whorl. Chamber interiors are simple and undivided with subacute peripheries. Walls are calcareous, with an organic inner lining, and are distinctly perforate. The aperture is a low interiomarginal arch near the periphery on the umbilical side, with narrow bordering lip. ''Rosalina'' has a stratigraphic range from the Eocene to recent and a cosmopolitan distribution. Related genera include ''

Neoconorbina ''Neoconorbina'' is a genus of recent ( Holocene) discorbacean foraminifers related to '' Rosalina'' with a low conical trochoidal test, circular in outline. The conical side is the spiral side, on which all three whorls are visible, the final c ...

'', ''

Rotorboides ''Rotorboides'' is a genus of recent (Holocene) bottom dwelling (benthic) forams from the Atlantic, Pacific and Indian Oceans, related to '' Rosalina''. The test is trochospiral and planoconvex, with a broadly rounded periphery and about six ...

'', and ''

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 w ...

''.

References

Joseph A. Cushman Joseph Augustine Cushman (January 31, 1881 – April 16, 1949) was an American geologist, paleontologist and Foraminifera, foraminiferologist. Biography He was born on January 31, 1881 in Bridgewater, Massachusetts, the son of Darius and Jane ( ...

, 1950. Foraminifera, their classification and economic use. Harvard University Press, Cambridge, Massachusetts. 4th edition, 1950 * * Alfred R. Loeblich,jr. and Helen Tappan, 1988. Forminiferal Genera and their classification. Geological Survey of Iran, (e-book) 2005

{{Taxonbar, from=Q7367210 Rosalinidae Rotaliida genera Extant Eocene first appearances