''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 The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...

to recent and a cosmopolitan distribution. Related genera include '' Neoconorbina'', ''

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''.

References

* Joseph A. Cushman, 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