Rosalina (foraminifera)

Rosalina
Temporal range: Eocene - Recent.
Scientific classification
(unranked):
SAR
(unranked):
Rhizaria
Phylum:
Granuloreticulosa
Class:
Foraminifera
Order:
Rotaliida
Superfamily:
Discorbacea
Family:
Rosalinidae
Genus:
Rosalina

d'Orbigny, 1826

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, Rotorboides, and Semirosalina.

References

  • Joseph A. Cushman, 1950. Foraminifera, their classification and economic use. Harvard University Press, Cambridge, Massachusetts. 4th edition, 1950
  • Loeblich, Alfred R.; Tappan, Helen (1964). Moore, R.C. (ed.). Protista 2: Sarcodina Chiefly "Thecamoebians" and Foraminiferida. Treatise on Invertebrate Paleontology. Vol. C (5th ed.). Geological Society of America. ISBN 978-0-8137-3003-5.
  • Alfred R. Loeblich,jr. and Helen Tappan, 1988. Forminiferal Genera and their classification. Geological Survey of Iran, (e-book) 2005. [1]

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