Rotaliida

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Rotaliida
Temporal range: Triassic - recent
Scientific classification
Domain: Eukaryota
Kingdom: Rhizaria
Superphylum: Retaria
Phylum: Foraminifera
Class: Rotalidia
Order: Rotaliida
Suborders

see text

The Rotallida are an order in the kingdom Protista, phylum or class Foraminifera characterized by multilocular tests (shells) composed of bilammelar per­forate hyaline lamellar calcite that may be optically radial or granular. Where the Foraminifera comprise a phylum, the class Rotalidia is equivalent to the order.

In form, rotaliid tests are typically enrolled, but maybe 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.

Taxonomy[edit]

The Rotaliida are now divided into these superfamilies:

Acervulinoidea
Annulopatellinoidea
Asterigerinoidea
Chilostomelloidea
Discorboidea
Discorbinelloidea
Glabratelloidea
Nonionoidea
Nummulitoidea
Orbitoidoidea
Planorbulinoidea
Rotalioidea
Siphoninoidea

References[edit]

  • A. R. Loeblich & H.Tappan, 1964. Sarcodina Chiefly "Thecamoebians" and Foraminiferida; Treatise on Invertebrate Paleontology, Part C Protista 2. Geological Society of America and University of Kansas Press.
  • 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. 

External links[edit]