Globothalamea

Orbitolina is an extinct genus of foraminifera belonging to the order Textulariida and family Orbitolinidae. Fossils of this genus are widely found in beds deposited in the Tethys Ocean ranging from Aptian (early Cretaceous) to Cenomanian (early Late Cretaceous) in age. It has been used as a shallow carbonate platform facies marker and as a Cretaceous index fossil.

Globothalamea comprises a class of multichambered foraminifera based in part on SSU rDNA evidence; the other is Tubothalamea.

Globorotalia is a genus of foraminifers belonging to the family Globorotaliidae. It is a single-celled animal large enough to be seen with a naked eye and is found in the fossil record back to the Paleocene. It is deep-dwelling planktonic foraminifers that inhabit the top few hundred meters of the ocean and constitute potential recorders of thermocline conditions. The genus has cosmopolitan distribution.

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 radiated aragonite.

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 organism. Commonly, the order had been made up of all species of Foraminifera with these types of shells, but genetic studies indicate these organisms do not form an evolutionary group, and several superfamilies in the order have been moved to the order Allogromiida. The remaining forms are sometimes divided into three orders: the Trochamminida and Lituol

Carterina is a genus in the family Trochamminidae, composing its own subfamily Carterininae. The genus is described from specimens gathered during the Challenger expedition's circumnavigation of the Earth from 1872-1876.

Gavelinellidae is a family of foraminifera belonging to the superfamily Chilostomelloidea and the order Rotaliida. It is found in marine sediments of the Barremian (early Cretaceous) and exists into the present-day (Holocene).

thumb|SEM photomicrograph of the test wall of Carterina spiculotesta, showing spicules in the organic matrix of the test. 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 family, Carterinidae.