Rosalina (foraminifera)
genus of foraminifers
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.
Begin with the source’s own compact description: “Rosalina (foraminifera)” is genus of foraminifers. The dossier treats that line as a proposition to test through Rosalina, foraminifera and genus, not as a finished interpretation.
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Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Oct 31, 2025. The linked authority identifier is Q7367210. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1950.
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This entry incorporates text from “Rosalina (foraminifera)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.