Craniforma
Encyclopedia
Craniata is a class
of Brachiopod originating in the Cambrian
and still extant today. They have calcitic inarticulated shells that are subcircular in outline. This subphylum of brachiopod
has an unsupported lophophore
and is always attached to a hard substrate in the fossil record. This hard substrate is usually another brachiopod. The plicae from the host brachiopod will then appear in the shell of the craniata.
Craniata is the only class
of brachiopods (lamp shells) from the subphylum
Craniformea. This class is further broken into three orders
. One of the orders is still living (the Craniida).
Craniata is another name for the Craniforma, but this is presently avoided due to the group of chordates
bearing the same name.
Class (biology)
In biological classification, class is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order...
of Brachiopod originating in 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...
and still extant today. They have calcitic inarticulated shells that are subcircular in outline. This subphylum of brachiopod
Brachiopod
Brachiopods are a phylum of marine animals that have hard "valves" on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection...
has an unsupported lophophore
Lophophore
The lophophore is a characteristic feeding organ possessed by four major groups of animals: the Brachiopoda, Bryozoa, Entoprocta, and Phoronida. All lophophores are found in aquatic organisms.-Characteristics:...
and is always attached to a hard substrate in the fossil record. This hard substrate is usually another brachiopod. The plicae from the host brachiopod will then appear in the shell of the craniata.
Craniata is the only class
Class (biology)
In biological classification, class is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order...
of brachiopods (lamp shells) from the subphylum
Subphylum
In life, a subphylum is a taxonomic rank intermediate between phylum and superclass. The rank of subdivision in plants and fungi is equivalent to subphylum.Not all phyla are divided into subphyla...
Craniformea. This class is further broken into three orders
Order (biology)
In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...
. One of the orders is still living (the Craniida).
Craniata is another name for the Craniforma, but this is presently avoided due to the group of chordates
Craniata
Craniata is a proposed clade of chordate animals that contains the Myxini , Petromyzontida , and Gnathostomata as living representatives...
bearing the same name.