Globigerinana are free living pelagic

foraminifera Foraminifera ( ; Latin for "hole bearers"; informally called "forams") are unicellular organism, single-celled organisms, members of a phylum or class (biology), class of Rhizarian protists characterized by streaming granular Ectoplasm (cell bio ...

n, included in the

class Class, Classes, or The Class may refer to: Common uses not otherwise categorized * Class (biology), a taxonomic rank * Class (knowledge representation), a collection of individuals or objects * Class (philosophy), an analytical concept used d ...

Rotaliata Rotaliata is a class of Foraminifera characterized by tests that are exclusively multichambered, mostly planospiral or trochspiral, or derived from either. The aperture is commonly at the base of the apertural face, at least in early stages, but ...

that range from the Jurassic to recent. Test are commonly planospiral or trochospiral but may be uniserial to multiserial and are of secreted hyaline (glassy) calcite. Chambers are flattened in planospiral forms and spheroidal in trochospiral and serial forms. Some have long radial spines, or needles that may be solidly fixed or moveable in sockets. Gametes are biflagellate and are produced in greater number than by bottom dwelling benthic forms. By comparison, the suborder Globigerinina Delage & Hérouard, 1896, foraminiferal order Rotaliida, are placed instead in the Kingdom

Chromista Chromista is a proposed but polyphyletic obsolete Biology, biological Kingdom (biology), kingdom, refined from the Chromalveolata, consisting of single-celled and multicellular eukaryotic species that share similar features in their Photosynthesi ...

with Rhizaria an infrakingdom Seven superfamilies are included, the Globigerinoidea, Globorotalioidea, Globogruncanoidea, Hantkeninoidea, Heterhelicoidea, Planomalinoidea, and Rotaliporoidea. Superfamilies with living members are the Heterohelicacea, Globorotaliacea, and Globigerinacea. The Heterohelicacea have chambers that are typically biserial or triserial throughout. Those in the Globorotaliacea are typically trochospiral and smooth while those in the Globigerinacea are trochospiral to planispiral in arrangement and spinose. Loeblich and Tappan, 1964,A.R. Loeblich jr & H Tappan 1964. Treatise on Invertebrate Paleontology Part C Protista 2 place globigerinids (Globigerinacea) in the Rotaliina, wherein Foraminifera is regarded as an order of protists. Fossil families are Heterohelicidae, Planomalinidae, Schachoididae, Rotaliporidae and Globotruncanidae. Extant (living) families include the Hantkeninidae, Globorotaliidae, and Globigeninidae, which compare with the superfamilies in Sen Gupta, 2002.

References

* Globigerinana Mikhalevich, 1980

Morphological classification of foraminifera. {{Taxonbar, from=Q20687081 Foraminifera taxa Rotaliata