Carterina
Encyclopedia
Carterinida is a small, recent, order of foraminifera
ns (in Kingdom Rhizaria
), once included in the Rotaliida
as the superamily Carterinacea, named by Loeblich and Tappan in 1955. Its present status as an order is based on the composition of the test (or shell) which is composed of large, fusiform, low-magnesium
calcite
spicules, commonly oriented parallel to the periphery, in a matrix of smaller spicules. The tests themselves are trochospiral with later chambers that may be subdivided by secondary septa known as septula.
The Carterinida contains a single family, the Carterinidae with a single genus, Carterina named by Brady in 1884, based on Rotalia spiculotesta Carter, 1877. It is found in shallow water and is either attached or free.
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 (in Kingdom Rhizaria
Rhizaria
The Rhizaria are a species-rich supergroup of unicellular eukaryotes. This supergroup was proposed by Cavalier-Smith in 2002. They vary considerably in form, but for the most part they are amoeboids with filose, reticulose, or microtubule-supported pseudopods...
), once included in the Rotaliida
Rotaliida
The Rotaliida are a large and abundant group of foraminiferans. They are primarily oceanic benthos, although some are common in shallower waters such as estuaries. They also include many important fossils, such as nummulites...
as the superamily Carterinacea, named by Loeblich and Tappan in 1955. Its present status as an order is based on the composition of the test (or shell) which is composed of large, fusiform, low-magnesium
Magnesium
Magnesium is a chemical element with the symbol Mg, atomic number 12, and common oxidation number +2. It is an alkaline earth metal and the eighth most abundant element in the Earth's crust and ninth in the known universe as a whole...
calcite
Calcite
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate . The other polymorphs are the minerals aragonite and vaterite. Aragonite will change to calcite at 380-470°C, and vaterite is even less stable.-Properties:...
spicules, commonly oriented parallel to the periphery, in a matrix of smaller spicules. The tests themselves are trochospiral with later chambers that may be subdivided by secondary septa known as septula.
The Carterinida contains a single family, the Carterinidae with a single genus, Carterina named by Brady in 1884, based on Rotalia spiculotesta Carter, 1877. It is found in shallow water and is either attached or free.