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Prolecanitida
Prolecanitida is an order of extinct ammonoid cephalopods, the major Late Paleozoic group of ammonoids alongside the order Goniatitida. Prolecanitids had narrow shells, discoidal (disc-shaped) to thinly lenticular (lens-shaped). They retained a retrochoanitic siphuncle, a simple form with septal necks extending backwards. As is typical for ammonoids, the siphuncle sits along the ventral margin of the shell. Prolecanitids form a relatively small and stable order within the Ammonoidea, with 43 named genera and about 1250 species. They were a long-ranging lineage, surviving for about 108 m.y. stretching from the Devonian–Carboniferous boundary to the Early Triassic. Although not as diverse as their goniatitid contemporaries, the Prolecanitida provided the stock from which all later Mesozoic ammonoids were derived. Most prolecanitids had goniatitic sutures. The sutures start at a narrow ventral lobe, which can range from undivided to tridentate (three-pointed). The saddles are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prolecanitoidea
Prolecanitoidea is a taxonomic superfamily of ammonoids in the order Prolecanitida. Prolecanitoidea is one of two superfamilies in the order, along with the younger and more complex Medlicottioidea. The Prolecanitoidea were a low-diversity and morphologically conservative group. They lived from the Lower Carboniferous up to the Middle Permian. Their shells are generally smooth and discoidal, with a rounded lower edge, a moderate to large umbilicus, and goniatitic to ceratitic sutures. Suture complexity varies from 10 up to 22 total lobes (each side of a whorl combined); new lobes are added from subdivision of saddles adjacent to the original main umbilical lobe. The Prolecanitoidea encompasses two related families, the ancestral Prolecanitidae (lower Tournaisian – Bashkirian? stages) and the derived Daraelitidae (Viséan – Wordian stages). Prolecanitids and daraelitids differ primarily in the complexity of the suture: Prolecanitids are simpler goniatitic forms, with round ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prolecanitidae
Prolecanitidae is a family of ammonites in the order Prolecanitida, with 10 genera. Genera Genera placed by Fossilworks Fossilworks was a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was cr .... * '' Becanites'' Korn, 1997 * '' Cantabricanites'' Weyer, 1965 * '' Dombarocanites'' Ruzhencev, 1949 * '' Eocanites'' Librovitch, 1957 * '' Katacanites'' Kullmann, 1963 * '' Merocanites'' Schindewolf, 1922 * '' Metacanites'' Schindewolf, 1922 * '' Michiganites'' Ruzhencev, 1962 * '' Prolecanites'' Mojsisovics, 1882 * '' Protocanites'' Schmidt, 1922 References Prolecanitida {{Paleo-cephalopod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medlicottioidea
The Medlicottioidea is one of two superfamilies that make up the Prolecanitida, the other being the Prolecanitoidea. The Medlicottioidea are recognized by their discoidal to thinly lenticular, and involute shells with small umbilici; flat, often grooved venters, and variably complex sutures. Medlicottiacean shells are often more ornamented and may sport ventrolateral nodes or ribs. The Medlicottioidea combines two related families, the ancestral Pronoritidae, descended from the Prolecanitidae in the Upper Mississippian and the derived Medlicottiidae which first appeared in the Lower Pennsylvanian. A third family, the Sageceratidae, considered to be derived from the Medlicottiidae, is included in the Ceratitida in more recent classifications. The Medlicottiaceae have become known by the alternative Medlicottiodea, following the recent ruling by the ICZN regarding superfamily endings. Medlicottiaceae nevertheless has a long standing in the literature with the taxonomic rank clear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonoidea
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family Nautilidae). The earliest ammonoids appeared during the Emsian stage of the Early Devonian (410.62 million years ago), with the last species vanishing during or soon after the Cretaceous–Paleogene extinction event (66 million years ago). They are often called ammonites, which is most frequently used for members of the order Ammonitida, the only remaining group of ammonoids from the Jurassic up until their extinction. Ammonoids exhibited considerable diversity over their evolutionary history, with over 10,000 species having been described. Ammonoids are excellent index fossils, and they have been frequently used to link rock layers in which a particular species or genus is found to specific Geologic time scale, geologic time periods. Their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daraelitidae
The Daraelitidae form a family in the ammonoid order Prolecanitida from the Upper Mississippian - Middle Permian characterized by discoidal shells with no prominent sculpture, moderately large umbilicus, and goniatitic or ceratitic sutures with a trifid (three pronged) ventral lobe and few auxiliary lobes. The Daraelitidae are part of the prolecanitid superfamily Prolecanitoidea and are the direct descendants of the Prolecanitidae. The Daraelitidae gave rise in the Middle Permian to the Xenodiscidae, the ancestral family of the mainly Triassic Ceratitida References * Miller, Furnish, and Schindewolf; Paleozoic Ammonoidea in the Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ..., Part-L, Ammonoidea, 1957, Geological Society of America. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xenodiscidae
The Xenodiscidae are the earliest of the Ceratitida and comprise Middle and Upper Permian genera characterized by compressed, discoidal, evolute shells with rounded to acute venters and commonly with lateral ribs. Sutures are goniatitic to weakly ceratitic.Arkell et al, 1957 The Xenodiscidae, which are part of the superfamily Xenodiscoidea, are derived from the Daraelitidae, a family in the Prolecanitida (ibid). In turn, the Xenodiscidae provided the root stock for the subsequent expansion and diversification of the Ceratitida in the Triassic. Notes References * Arkell et al., 1957; Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ..., Part-L, Ammonoidea; Geological Soc. of America, reprinted 1990. The Paleobiology Databa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prolobitidae
Prolobitidae is a family of middle and upper Devonian ammonoid cephalopods currently included in the goniatitid suborder Tornoceratina and superfamily Dimeroceratoidea, but previously included in the ancestral Anarcestida. Prolobitids are characterized by goniatitic sutures with an undivided ventral lobe and primary lateral lobes that are introduced in the umbilical region. They have shells which are discoidal to subglobular, some bearing transverse ribs and the umbilicus is generally moderate to closed. Prolobitidae is divided into two subfamilies, Prolobitinae consisting of subglobular to subdiscoidal shells with moderate to closed umbilici, and Raymondoceratinae consisting of discodal shells with transverse ribs and large umbilici. The Prolobitidae have been considered the likely ancestors for Prolecanitida. References * Miller, Furnish, and Schindewolf,1957; Paleozoic Ammonoidea, Suborder Anarcestina, L29-L33, in The Treatise on Invertebrate Paleontology The ''Tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Episageceratinae
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 A treatise is a Formality, formal and systematic written discourse on some subject concerned with investigating or exposing the main principles of the subject and its conclusions."mwod:treatise, Treatise." Merriam-Webster Online Dictionary. Acc ... (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 ''E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
