Noritaceae
Encyclopedia
Noritaceae is an extinct superfamily
of cephalopod
s belonging to the Ammonite
order
Ceratitida
.
The Noritaceae, defined by Karpinsky in 1889, combines ceratitids with "typically smooth, more or less discoidal shells with rounded or truncate peripheries and ceratitic sutures,...." Keeled or ribbed offshoots may have simpler or more complex sutures.
Noritidae, not Noritidea, is the type family of the Noritaceae and may have been derived from the Dieneroceratidae through the Xenoceltitidae.
The Inyoitidae is based on the Inyoitinae which is removed from the Xenoceltitidae and elevated in rank.
The Lanceolitidae , containing Lanceolites as the sole representative, was included in the Hedenstroemiidae as the Lanceolitinae.
The Ophiceratidae is removed from the Otocerataceae, the Stephanoceratidae from the Ceratitaceae. The Ussuriidae is a small family retained in the Noritaceae.
The Flemingitidae and Meekoceratidae have been place in the Meekocerataceae along with the Prionitidae and Proptychitidae.
The Hedenstroemiidae, less the Lanceolitinae , have been combined with middle and upper Triassic late derivatives of the Medlicottiadae, the Sageceratidae, in what is known as the Sageceratceae. Medlicottiadae is a family in the Melicottiaceae, a superfamily of prolecanitids (order Prolecanitida).
Sageceras, type genus of the Sageceratidae, is described as having lenticular shells with flattened bicarinate venters and small umbilici. Sutures form numerous subequal auxiliary and adventitious lobes.
Hedenstroemiidae are described as having discoidal, compressed, generally smooth, involute shells with tabulate to oxynote venters. Suture are ceratitic with adventitious saddles and lobes.
Taxonomic rank
In biological classification, rank is the level in a taxonomic hierarchy. Examples of taxonomic ranks are species, genus, family, and class. Each rank subsumes under it a number of less general categories...
of cephalopod
Cephalopod
A cephalopod is any member of the molluscan class Cephalopoda . These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles modified from the primitive molluscan foot...
s belonging to the Ammonite
Ammonite
Ammonite, as a zoological or paleontological term, refers to any member of the Ammonoidea an extinct subclass within the Molluscan class Cephalopoda which are more closely related to living coleoids Ammonite, as a zoological or paleontological term, refers to any member of the Ammonoidea an extinct...
order
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...
Ceratitida
Ceratitida
The Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the exception being the phylloceratids which gave rise to the great diversity of post Triassic ammonites....
.
The Noritaceae, defined by Karpinsky in 1889, combines ceratitids with "typically smooth, more or less discoidal shells with rounded or truncate peripheries and ceratitic sutures,...." Keeled or ribbed offshoots may have simpler or more complex sutures.
Taxonomy
The Noritaceae as revised (Tozer 1981) is composed of the Noritidae, Inyoitidae, Lanceolitidae, Ophiceratidae, Stephanitidae, UssuriidaeNoritidae, not Noritidea, is the type family of the Noritaceae and may have been derived from the Dieneroceratidae through the Xenoceltitidae.
The Inyoitidae is based on the Inyoitinae which is removed from the Xenoceltitidae and elevated in rank.
The Lanceolitidae , containing Lanceolites as the sole representative, was included in the Hedenstroemiidae as the Lanceolitinae.
The Ophiceratidae is removed from the Otocerataceae, the Stephanoceratidae from the Ceratitaceae. The Ussuriidae is a small family retained in the Noritaceae.
Noritacean taxonomy in the Treatise
The Treatise, Part L, gives 13 families in the Noritacea, six of which collectively contain 15 subfamilies. Of these:The Flemingitidae and Meekoceratidae have been place in the Meekocerataceae along with the Prionitidae and Proptychitidae.
The Hedenstroemiidae, less the Lanceolitinae , have been combined with middle and upper Triassic late derivatives of the Medlicottiadae, the Sageceratidae, in what is known as the Sageceratceae. Medlicottiadae is a family in the Melicottiaceae, a superfamily of prolecanitids (order Prolecanitida).
Sageceras, type genus of the Sageceratidae, is described as having lenticular shells with flattened bicarinate venters and small umbilici. Sutures form numerous subequal auxiliary and adventitious lobes.
Hedenstroemiidae are described as having discoidal, compressed, generally smooth, involute shells with tabulate to oxynote venters. Suture are ceratitic with adventitious saddles and lobes.