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Temporal range: Triassic - recent
Ammonia beccarii.jpg
Ammonia beccarii (Rotaliidae)
Scientific classification e
Clade: SAR
(unranked): Rhizaria
Superphylum: Retaria
Phylum: Foraminifera
Class: Globothalamea
Order: Rotaliida
Delage & Hérouard, 1896
Suborders and superfamilies

See text

The Rotaliida are an order of Foraminifera, characterized by multilocular tests (shells) composed of bilamellar perforate hyaline lamellar calcite that may be optically radial or granular.

In form, rotaliid tests are typically enrolled, but may be reduced to biserial or uniserial, or may be encrusting with proliferated chambers. Chambers may be simple or subdivided by secondary partitions; the surface is smooth, papillate, costate, striate, or cancellate; the aperture is simple or with an internal toothplate, entosolenian tube, or hemicylindrical structure; it may have an internal canal or stolen systems.

Rotaliids are primarily oceanic benthos, although some are common in shallower estuarine waters, they also include many important fossils, such as the nummulitids.


The Rotaliida are now divided into the following superfamilies:[1]


  1. ^ Rotaliida, World Foraminifera Database, accessed 27 November 2018
  • Loeblich, Alfred R.; Tappan, Helen (1964). Moore, R.C. (ed.). Protista 2: Sarcodina Chiefly "Thecamoebians" and Foraminiferida. Treatise on Invertebrate Paleontology. C (5th ed.). Geological Society of America. ISBN 978-0-8137-3003-5.
  • Loeblich, Jr, Alfred R.; Tappan, Helen (1988). Foraminiferal genera and their classification. New York: Van Nostrand Reinhold Co. ISBN 9780442259372.
  • Gupta, Barun K. Sen, ed. (1999). Modern foraminifera (Repr. with corr. ed.). Dordrecht [u.a.]: Kluwer Acad. Publ. ISBN 0412824302.

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