Globothalamea comprises a class of multichambered

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 ...

based in part on SSU rDNA evidence; the other is

Tubothalamea Tubothalamea is a taxonomic class established for foraminifera Foraminifera ( ; Latin for "hole bearers"; informally called "forams") are unicellular organism, single-celled organisms, members of a phylum or class (biology), class of Rhizaria ...

. Six orders are included, which vary notably in composition, wall structure, and chamber arrangement. The Lituolida,

Loftusiida Loftusiida is an order of foraminifers in the class Globothalamea. Subtaxa Suborder Ataxophragmiina * Superfamily Ataxophragmioidea ** Family Ataxophragmiidae ** Family †Cuneolinidae ** Family Dictyopsellidae ** Family Dicyclinidae ** Famil ...

, and

Textulariida The Textulariida are an order of foraminifera that produce agglutinated shells or tests. An agglutinated test is one made of foreign particles glued together with an organic or calcareous cement to form an external shell on the outside of the ...

(as emended) have tests (shells) of agglutinated matter, glued together by various cements, but differ in chamber arrangement, wall structure, and complexity. In contrast the

Carterinida Carterinida is an order of multi-chambered foraminifera within the Globothalamea. Members of this order form hard tests out of thin calcite rods known as spicules, which are held together by a proteinaceous matrix. , the order contains a single f ...

Robertinida The Robertinida are an order of Middle Triassic to recent, benthic foraminifera in which tests are planispirally to trochospirally coiled, with chambers provided with an internal partition and hyaline perforated walls composed of optically radiat ...

and

Rotaliida 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 ...

, with buliminids lumped into the Rotaliida, have calcareous tests. Those of rotaliid genera, which vary considerably, are of perforate hyaline (glassy)

calcite Calcite is a Carbonate minerals, carbonate mineral and the most stable Polymorphism (materials science), polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on ...

. in contrast the Carterinida have tests composed of bundled calcite spicules. The Robertida differ in being composed, instead, of aragonite. Foraminifera genera and their description
A.R. Loeblich jr & H. Tappan, 1988. e-book. Subclass Textulariia * Orders: Lituolida –

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Unassigned * Orders:

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References

{{Taxonbar, from=Q19844835 Foraminifera classes