Textulariida
Encyclopedia
The Textulariida is a group of common foraminifera
ns that produce agglutinated shells, composed of foreign particles held in an organic or calcareous cement. Commonly the order is taken to include all such species, but genetic studies indicate that they are not all closely related, and several superfamilies have been moved to the order Allogromiida
. The remaining forms are sometimes divided into three orders: the Trochamminida and Lituolida which have organic cement and the Textulariida sensu stricto which uses calcareous cement. All three are known as fossils from the Cambrian
onwards.
Foraminifera
The Foraminifera , or forams for short, are a large group of amoeboid protists which are among the commonest plankton species. They have reticulating pseudopods, fine strands of cytoplasm that branch and merge to form a dynamic net...
ns that produce agglutinated shells, composed of foreign particles held in an organic or calcareous cement. Commonly the order is taken to include all such species, but genetic studies indicate that they are not all closely related, and several superfamilies have been moved to the order Allogromiida
Allogromiida
The Allogromiida are a group of monothalamous , mostly organic-walled foraminiferans, including some that produce agglutinated tests . Genetic studies have shown that some foraminiferans with agglutinated tests, previously included in the Textulariida or as their own order Astrorhizida, also...
. The remaining forms are sometimes divided into three orders: the Trochamminida and Lituolida which have organic cement and the Textulariida sensu stricto which uses calcareous cement. All three are known as fossils from the Cambrian
Cambrian
The Cambrian is the first geological period of the Paleozoic Era, lasting from Mya ; it is succeeded by the Ordovician. Its subdivisions, and indeed its base, are somewhat in flux. The period was established by Adam Sedgwick, who named it after Cambria, the Latin name for Wales, where Britain's...
onwards.