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Scaphitidae
Scaphitidae is a family of extinct cephalopods belonging to the family of heteromorph ammonites (suborder Ancyloceratina). There is a possible fossil record of them being the last ammonites with fossils dating to the Danian of the Paleocene in Denmark, the Netherlands, the US and Turkmenistan. Genera Scaphitidae Gill, 1871 *Subfamily Otoscaphitinae Wright, 1953 **'' Yezoites'' Yabe, 1910 *Subfamily Scaphitinae Gill, 1871 **'' Acanthoscaphites'' Nowak, 1911 **'' Clioscaphites'' Cobban, 1951 **'' Discoscaphites'' Meek, 1870 **'' Eoscaphites'' Breistroffer, 1947 **'' Hoploscaphites'' Nowak, 1911 **'' Indoscaphites'' Spath, 1953 **'' Jeletzkytes'' Riccardi, 1983 **'' Ponteixites'' Warren, 1934 **'' Rhaeboceras'' Meek, 1876 **''Scaphites ''Scaphites'' is a genus of heteromorph ammonites belonging to the Scaphitidae family. They were a widespread genus that thrived during the Late Cretaceous period. Morphology ''Scaphites'' generally have a chambered, boat-shaped shell. The ini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yezoites
''Yezoites'' is an extinct genus of ammonites placed in the family Scaphitidae. The genus is known lived during the Upper Cretaceous and was first described in 1910. The genus contains five species, ''Y. bladenensis'', ''Y. orbignyi'', ''Y. planus'', ''Y. puerculus'', and ''Y. subevolutus''. ''Yezoites'' was first discovered in the Upper Cretaceous Yezo Group, Hokkaido is the list of islands of Japan by area, second-largest island of Japan and comprises the largest and northernmost prefectures of Japan, prefecture, making up its own list of regions of Japan, region. The Tsugaru Strait separates Hokkaidō fr ..., Japan and has since been identified in Antarctica, Denmark, France, Madagascar, and the United States. The shell has wide spaced ribbing. References Ammonitida genera Scaphitidae Cretaceous animals of Africa Coniacian genus first appearances Santonian genus extinctions {{Ammonitida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Danian
The Danian is the oldest age or lowest stage of the Paleocene Epoch or Series, of the Paleogene Period or System, and of the Cenozoic Era or Erathem. The beginning of the Danian (and the end of the preceding Maastrichtian) is at the Cretaceous–Paleogene extinction event . The age ended , being followed by the Selandian. Stratigraphic definitions The Danian was introduced in scientific literature by German-Swiss geologist Pierre Jean Édouard Desor in 1847 following a study of fossils found in France and Denmark.Danien Den Store Danske Encyklopædi He identified this stage in deposits from [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hoploscaphites
''Hoploscaphites'' is an extinct ammonite genus from the Upper Cretaceous and the Lower Paleocene, included in the family Scaphitidae. Morphology It is considered by some to be a subgenus of ''Scaphites''. Like ''Scaphites,'' the shell of ''Hoploscaphites'' is involute with the final whorl projecting forward and curving back on itself. Shells vary from compressed to inflated with convex sides. Tubercles normally present may be sparse or absent. Distribution Fossils of ''Hoploscaphites'' have been found in Antarctica, Austria, Belgium, Bulgaria, Canada (Alberta, Saskatchewan), Chile, Denmark, France, Germany, Greenland, India, the Netherlands, Turkmenistan, Ukraine and the United States (Arkansas, Colorado, Delaware, Kansas, New Jersey, New Mexico, North Dakota, South Dakota, Texas, Wyoming).''Hoploscaphites'' [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scaphites
''Scaphites'' is a genus of heteromorph ammonites belonging to the Scaphitidae family. They were a widespread genus that thrived during the Late Cretaceous period. Morphology ''Scaphites'' generally have a chambered, boat-shaped shell. The initial part (juvenile stage) of the shell is generally more or less involute (tightly coiled) and compressed, giving no hint of the heteromorphic shell form yet to come. The terminal part (adult stage) is much shorter, erect, and bends over the older shell like a hook. They have transverse, branching ribs with tubercles (small bumps) along the venter. Reconstructions of the body within the shell can be made to portray ''Scaphites'' as either a benthic (bottom-dwelling) or planktonic animal, depending on where the center of gravity is located. Since useful fossils of the soft-body parts of cephalopods are highly rare, little is known about how this animal actually fit into its shell and lived its life. Age Because ''Scaphites'' and its relat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jeletzkytes
''Jeletzkytes'' is an extinct genus of scaphatoid ammonite from the Upper Cretaceous (Maastrichtian) of North America named and described by Riccardi, 1983. In overall form ''Jeletzkytes'' closely resembles the genus ''Scaphites ''Scaphites'' is a genus of heteromorph ammonites belonging to the Scaphitidae family. They were a widespread genus that thrived during the Late Cretaceous period. Morphology ''Scaphites'' generally have a chambered, boat-shaped shell. The ini ...''. A number of species have been described in the genus including: *''J. brevis'' *''J. compressus'' *''J. crassus'' *''J. criptonodosus'' *''J. dorfi'' *''J. furnivali'' *''J. nebrascensis'' *''J. nodosus'' *''J. spedeni'' References Jeletzkytes Paleobiology Database. 13 Mar. 2013. * Neil H. Landman, Karl M Waage (Karl Mensch); Scaphitid ammonites of the Upper Cretaceous (Maastrichtian) Fox Hills Formation in South Dakota and Wyoming. Bulletin of the AMNH ; no. 215, 1993 Ammonitida genera Scaphiti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clioscaphites
''Clioscaphites'' is an extinct genus of ammonite belonging to the family Scaphitidae. Species in this genus are important index fossils of the Western Interior Seaway of the Coniacian to Santonian Ages of the Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the .... References Mesozoic animals Scaphitidae Late Cretaceous ammonites of North America {{Ammonite-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhaeboceras
''Rhaeboceras'' is an extinct genus of ammonite belonging to the subfamily Scaphitinae. Species belonging to the genus lived during the Cretaceous and have been found in the Pierre Shale of North America. Taxonomy The genus ''Ponteixites'' is currently deemed a junior synonym In taxonomy, the scientific classification of living organisms, a synonym is an alternative scientific name for the accepted scientific name of a taxon. The botanical and zoological codes of nomenclature treat the concept of synonymy differently. ... of ''Rhaeboceras'', with most specimens formerly assigned to ''Ponteixites'' appearing to be juveniles. The finding of a larger fossil specimen assigned to ''P. robustus'' similar to these juvenile remains provides evidence supporting this lumping. References Cretaceous ammonites Scaphitidae {{Ammonite-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discoscaphites
''Discoscaphites '' is an extinct genus of ammonite 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 N .... This genus may have been one of the few to have briefly survived the K-Pg mass extinction. Distributions Cretaceous of Greenland, Alabama, Arkansas, California, Colorado, Kansas, Maryland, Mississippi, Missouri, New Jersey, South Dakota, Tennessee, Texas, Wyoming, and North Carolina. ''Discoscaphites'' is present in the famous Pinna Layer of the Tinton Formation of New Jersey (above the iridium anomaly), with even possible records in the layer above, along with ''Eubaculites''. Some researchers prefer a conservative interpretation when dating the Pinna Layer, the other remains still suggest ''Discoscaphites'' was a K-Pg survivor, albeit restricted to 65 Ma. References Exte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthoscaphites
''Acanthoscaphites'' is an extinct genus of cephalopod belonging to the Ammonite subclass. The average diameter of its shell was approximately , but some specimens have been found with a diameter of slightly over . Classification ''Acanthoscaphites'' was first described by Schluter in 1872. Subsequent taxonomic revisions indicate that the relationship between ''Acanthoscaphites'' and ''Trachyscaphites'' is still unclear: ''Acanthoscaphites'' may have evolved in parallel with or as a derivative of ''Trachyscaphites''. Species *''A. plenus'' *''A. tridens'' *''A. verneuilianus'' Biogeography ''Acanthoscaphites'' was a widespread genus during Campanian and Maastrichtian The Maastrichtian ( ) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (geology), age (uppermost stage (stratigraphy), stage) of the Late Cretaceous epoch (geology), Epoch or Upper Cretaceous series (s ... times, approximately 80 million years ago. Its remains can be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonite
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] |
