Rotaliida

Rotaliida Temporal range: Triassic - recent
Scientific classification
Domain:	Eukaryota
(unranked):	SAR
(unranked):	Rhizaria
Phylum:	Retaria
Subphylum:	Foraminifera
Suborders
see text

The Rotallida are an order in the kingdom Protista, phylum, subphylum 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

The Rotaliida are now divided into these superfamilies:

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

References

• A.R. Loeblich and 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.

External links

• Suborder ROTALIINA Delage and Hérouard, 1896 (Geological Survey of Iran)