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Turrilitoidea
Turrilitoidea is a diverse superfamily of Cretaceous ammonites generally considered as heteromorphic and commonly included in the suborder Ancyloceratina. Shells of this diverse group do not coil planospirally, as typical for most ammonitida, ammonites, but rather take on a variety of unique forms. Separation of Turrilitoidea along with Ptychoceratoidea and Scaphatoidea into a different suborder, Turrilitina, was proposed by Beznosov and Mikhailova in 1983 however this view is not accepted by most authors. Some, such as the eponymous ''Turrilites'', coiled helically, like an auger shell, while others, such as ''Hamites (genus), Hamites'', had shells with long straight sections, while the one-of-a-kind ''Nipponites'' coiled in a way so as to appear as a ball of knots. As with other ammonites, the last of the Turrilitoidea had perished by the end of the Cretaceous during the Cretaceous–Paleogene extinction event. References * Arkell ''et al.'', 1957. Mesozoic Ammonoidea,' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turrilitoidea
Turrilitoidea is a diverse superfamily of Cretaceous ammonites generally considered as heteromorphic and commonly included in the suborder Ancyloceratina. Shells of this diverse group do not coil planospirally, as typical for most ammonitida, ammonites, but rather take on a variety of unique forms. Separation of Turrilitoidea along with Ptychoceratoidea and Scaphatoidea into a different suborder, Turrilitina, was proposed by Beznosov and Mikhailova in 1983 however this view is not accepted by most authors. Some, such as the eponymous ''Turrilites'', coiled helically, like an auger shell, while others, such as ''Hamites (genus), Hamites'', had shells with long straight sections, while the one-of-a-kind ''Nipponites'' coiled in a way so as to appear as a ball of knots. As with other ammonites, the last of the Turrilitoidea had perished by the end of the Cretaceous during the Cretaceous–Paleogene extinction event. References * Arkell ''et al.'', 1957. Mesozoic Ammonoidea,' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anisoceratidae
Anisoceratidae is an extinct Family (biology), family of heteromorph ammonites which belong to the Ancyloceratina superfamily Turrilitoidea. Members of the family range is from the lower Albian to the upper Turonian. The family is possibly derived from a member of the Hamitidae. Morphology Anisoceratid shells begin as an irregular helical spiral which typically becomes confined to a single plane with growth. This is usually followed by at least a single straight shaft. Ribs and tubercles are common features. History and classification Older classifications, since first publication of Part L of the Treatise on Invertebrate Paleontology, include the Anisoceratidae in the suborder Ancyloceratina (within the Turrilitoidea). Subsequent study, e.g. Beznosov & Mikhailova 1983, has suggested that the Turrilitoidea, including the Anisoceratidae, have a different phylogeny from the true Ancyloceratina, resulting in their occasional reassignment to a separate suborder, the Turrilitina, how ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hamites (genus)
''Hamites'' (" hook-like") is a genus of heteromorph ammonite that evolved late in the Aptian stage of the Early Cretaceous and lasted into the Cenomanian stage of the Late Cretaceous. The genus is almost certainly paraphyletic but remains in wide use as a "catch all" for heteromorph ammonites of the superfamily Turrilitoidea that do not neatly fit into the more derived groupings. In an attempt to identify clades within the genus, it has been divided up into a series of new genera or subgenera by different palaeontologists, including ''Eohamites'', ''Hamitella'', ''Helicohamites'', ''Lytohamites'', ''Planohamites'', ''Psilohamites'', and ''Sziveshamites''. The type species is ''Hamites attenuatus'' from the early Albian, named by James Sowerby in his ''Mineral Conchology of Great Britain'' of 1814, although the genus itself was created by James Parkinson in his 1811 book ''Organic Remains of the Former World''. This James Parkinson is best known as the first scientific de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baculitidae
Baculitidae is a family of extinct Ammonoidea, ammonoid cephalopods that lived mostly during the Late Cretaceous, and often included in the suborder Ancyloceratina. Baculitid genera are characterized by a small to minute initial coil of about two whorls followed by a long straight or slightly curved shaft. Genera are distinguished on the basis of size, general shape, particulars of the suture, and ornamentation. They can reach lengths of or more. Baculitids are found worldwide in deposits from the upper Albian to the Maastrichtian ages. Related families are the Anisoceratidae, Diplomoceratidae, Hamitidae, Nostoceratidae, and Turrilitidae; all of which along with the Baculitidae are included in the superfamily Turrilitoidea. Genera included in the family include: *''Baculites'' *''Boehmoceras'' *''Eubaculites'' *''Euhomaloceras'' *''Fresvillia'' *''Lechites (genus), Lechites'' *''Pseudobaculites'' *''Sciponoceras'' *''Tuberosciponoceras '' References External links The Pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hamitidae
''Hamites'' (":wikt:Hamites, hook-like") is a genus of heteromorph ammonite that evolved late in the Aptian stage of the Early Cretaceous and lasted into the Cenomanian stage of the Late Cretaceous. The genus is almost certainly paraphyletic but remains in wide use as a "catch all" for heteromorph ammonites of the superfamily Turrilitoidea that do not neatly fit into the more Synapomorphy, derived groupings. In an attempt to identify clades within the genus, it has been divided up into a series of new genera or subgenera by different Paleontology, palaeontologists, including ''Eohamites'', ''Hamitella'', ''Helicohamites'', ''Lytohamites'', ''Planohamites'', ''Psilohamites'', and ''Sziveshamites''. The type species is ''Hamites attenuatus'' from the early Albian, named by James Sowerby in his ''Mineral Conchology of Great Britain'' of 1814, although the genus itself was created by James Parkinson in his 1811 book ''Organic Remains of the Former World''. This James Parkinson is bes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancyloceratina
The Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina. They evolved during the Late Jurassic but were not very common until the Cretaceous period, when they rapidly diversified and became one of the most distinctive components of Cretaceous marine faunas. They have been recorded from every continent and many are used as zonal or index fossils. The most distinctive feature of the majority of the Ancyloceratina is the tendency for most of them to have shells that are not regular spirals like most other ammonites. These irregularly-coiled ammonites are called heteromorph ammonites, in contrast to regularly coiled ammonites, which are called homomorph ammonites. Biology The biology of the heteromorph ammonites is not clear, but one certainty is that their uncoiled shells would have made these forms very poor swimmers. Open shells, particularly ones with spines and ribs, create a lot of drag; but more importantly, the orient ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turrilitina
Turrilitina is a proposed suborder of Cretaceous heteromorph ammonoid cephalopods derived from the Lytoceratidae in the Hauterivian stage of the Lower Cretaceous that would include the superfamilies Turrilitoidea, Ptychoceratoidea, and Scaphatoidea. Turrilitina was recognized as a distinct group or clade from the Ancyloceratina as defined by Weidmann, 1966, by Beznosov and Mikhailova in 1983. The group may have its origin in the ammonitid superfamily Perisphinctaceae. Turrilitina is the Turrilitaceae of Arkell ''et al'' 1957, including the Ptychoceratidae and Macroscaphitidae, along with the Scaphitaceae which the Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') 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 co ... shows with a separate and later derivation from the Lytoceratidae. Acc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diplomoceratidae
Diplomoceratidae is a family of ammonites included in the order Ammonitida. Fossils of species within this genus have been found in the Cretaceous sediments (age range: from 99.7 to 66.043 million years ago). Studies of ''Diplomoceras'' suggest that members of this family could reach lifespans of over 200 years. Genera * '' Chesapeakella'' Kennedy and Cobban, 1993 * ''Diplomoceras ''Diplomoceras'' is a genus of ammonites included in the family Diplomoceratidae. Fossils of species within this genus have been found in the Late Cretaceous sediments (age range: Campanian-Maastrichtian The Maastrichtian () is, in the ICS ...'' Hyatt, 1900 * '' Glyptoxoceras'' Spath, 1925 * '' Neancyloceras'' Spath, 1926 * '' Scalarites'' Wright and Matsumoto, 1954 * '' Neoglyptoxoceras'' Collignon, 1969 * '' Phylloptychoceras'' Spath, 1953 * '' Oxybeloceras'' Hyatt, 1900 * '' Polyptychoceras'' Yabe, 1927 * '' Pseudoxybeloceras'' Wright and Matsumoto, 1954 * '' Solenoceras'' Conrad, 1860 Ref ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nostoceratidae
Nostoceratidae is a diverse Family (biology), family of heteromorph ammonites found throughout the oceans of the world during the Late Cretaceous. The nostoceratids are famous for the bizarre coiling of their shells. Many genera, such as ''Yezoceras'', ''Ainoceras'', ''Anaklinoceras'', and some species of ''Bostrychoceras'' and ''Eubostrychoceras'', display, as young shells at least, a helical coiling very similar to the shells of the related family, Turrilitidae. As adults, though, the coils then curve away from the axis of coiling, either as an oxbow-like curve around the juvenile coils as in ''Ainoceras'' and ''Anaklinoceras'', or in a simple curved loop beneath the juvenile coils, as in ''Yezoceras''. Other genera form loose coils, sometimes in a spiral, such as those of ''Madagascarites'', ''Muramotoceras'', ''Hyphantoceras'', and the infamously convolute ''Nipponites''. The ecology of nostoceratids is the subject of continued speculation, as the bizarrely coiled shells ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turrilitidae
Turrilitidae is a family of extinct heteromorph ammonite cephalopods. All members had shells that coiled helically that tended to resemble auger shells. The ecological roles turrilitids played is largely unknown, as experts are still speculating what niches they filled. Some are suspected of floating in the water column, while others, such as the eponymous '' Turrilites'', are believed to have been bottom-dwellers. The name of the type genus ''Turrilites'' is a hybrid formation based on Latin ''turris'' "tower" and Greek ''lithos'' "stone", coined by Lamarck in 1801. Although they were diverse and cosmopolitan, the turrilitids, along with all other ammonites, did not survive the Cretaceous–Paleogene extinction event The Cretaceous–Paleogene (K–Pg) extinction event (also known as the Cretaceous–Tertiary extinction) was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago. With the .... Referen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turrilites
''Turrilites'' is a genus of helically coiled ammonoid cephalopods from the lower part of the Upper Cretaceous (Cenomanian and Turonian); generally included in the Ancyloceratina. Previously (Arkell, 1957) it was included in the ammonoid suborder, Lytoceratina Lytoceratina is a Suborder (biology), suborder of Jurassic and Cretaceous Ammonitida, ammonites that produced loosely coiled, evolute and gyroconic shells in which the sutural element are said to have complex moss-like endings. Morphologic chara .... The shell of ''Turrilites'' is tightly wound in a high trochospiral, with an acute angle at the apex. Ribs are weak to strong and may have 3 or 4 rows of equal numbers of tubercles. Thought to be derived from '' Mariella''. Includes three subgenera. Subgenera and species ''Turrilites'' has three subgenera. * '' Turrilites (Turrilites)'' Lamarck, 1801 ** ''Turrilites (Turrilites) acutus'' Passy, 1832 ** '' Turrilites (Turrilites) costatus'' Lamarck, 1801 ** ''Turrilites (Tu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aptian
The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous Epoch or Series and encompasses the time from 121.4 ± 1.0 Ma to 113.0 ± 1.0 Ma (million years ago), approximately. The Aptian succeeds the Barremian and precedes the Albian, all part of the Lower/Early Cretaceous. The Aptian partly overlaps the upper part of the Western European Urgonian Stage. The Selli Event, also known as OAE1a, was one of two oceanic anoxic events in the Cretaceous Period, which occurred around 120 Ma and lasted approximately 1 to 1.3 million years. The Aptian extinction was a minor extinction event hypothesized to have occurred around 116 to 117 Ma.Archangelsky, Sergio.The Ticó Flora (Patagonia) and the Aptian Extinction Event" ''Acta Paleobotanica'' 41(2), 2001, pp. 115-22. Stratigraphic definitions The Aptian was named after the small city of Apt in the Provence region of France, which is also known for its cry ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
