Episageceratinae
Encyclopedia
Episageceratinae is a subfamily of the Medlicottiidae
, a family of prolecanitid
ammonites. The Episageceratinae, proposed by Ruzhencev, 1956, is based on the genus Episageceras previously included in the subfamily Medlicottiinae
and lived during Late Permian and Early Triassic times.
So far only three confirmed genera are included: Episageceras, Latisageceras, and Nodosageceras.
The type genus, Episageceras, named by Noetling 1904, is defined in the Treatise
(L74) as like Medlicottia
but with a broader shell and sutures with a smaller second lateral lobe. Latisageceras and Nodosageceras named by Ruzhencev 1956 are based on species of Episageceras.
J.P Smith, 1932 (USGS PP 167) included Episageceras in the Pronoritidae (p.36) as a subgenus of Medlicottia.
Medlicottiidae
Medlicottiidae is a family of ammonoid cephalopods belonging to the Prolecanitida, known from the Upper Carboniferous to the Early Triassic.-Characteristics:...
, a family of prolecanitid
Prolecanitida
The Prolecanitida are extinct ammonoid cephalopods with discoidal to thinly lenticular shells with goniatitic or ceratitic sutures and which retained the simple retrochoanitic siphuncle with backward extending septal necks. As typical for ammonoids the siphuncle is along the ventral margin...
ammonites. The Episageceratinae, proposed by Ruzhencev, 1956, is based on the genus Episageceras previously included in the subfamily Medlicottiinae
Medlicottiinae
The Medlicottiinae a subfamily of the Medlicottiidae, a family of ammonoid cephalopods included in the Prolecanitida, characterized by having discoidal to thinly lenticular shells with a retuse venter and sutures with bifid auxiliary lobes....
and lived during Late Permian and Early Triassic times.
So far only three confirmed genera are included: Episageceras, Latisageceras, and Nodosageceras.
The type genus, Episageceras, named by Noetling 1904, is defined in the Treatise
Treatise on Invertebrate Paleontology
The Treatise on Invertebrate Paleontology published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and...
(L74) as like Medlicottia
Medlicottiinae
The Medlicottiinae a subfamily of the Medlicottiidae, a family of ammonoid cephalopods included in the Prolecanitida, characterized by having discoidal to thinly lenticular shells with a retuse venter and sutures with bifid auxiliary lobes....
but with a broader shell and sutures with a smaller second lateral lobe. Latisageceras and Nodosageceras named by Ruzhencev 1956 are based on species of Episageceras.
J.P Smith, 1932 (USGS PP 167) included Episageceras in the Pronoritidae (p.36) as a subgenus of Medlicottia.
References
- Goniat >Prolecanitina 11/07/11
- Episageceratinae-Paleobio 11/07/11
- Treatise on Invertebrate Paleontology Part L (Ammonoidea). Geological Society of America and University of Kansas Press, 1957. p.L74 Medlicottiinae.
- J.P. Smith, 1932. Lower Triassic Ammonites of North America. U.S. Geological Survey Professional Paper 167.