Rotaliida

Last updated

Rotaliida
Temporal range: Middle Triassic - present, 242–0  Ma [1]
Ammonia beccarii.jpg
Ammonia beccarii (Rotaliidae)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Clade: Sar
Clade: Rhizaria
Phylum: Retaria
Subphylum: Foraminifera
Class: Globothalamea
Subclass: Rotaliana
Order: Rotaliida
Lankester, 1885
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.

Contents

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.

Taxonomy

The Rotaliida are now divided into the following superfamilies: [2]

References

  1. "Rotaliida". Mindat. Hudson Institute of Mineralogy. Retrieved 3 December 2020.
  2. Rotaliida, World Foraminifera Database, accessed 27 November 2018