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Blanfordiceras Boehmi
''Blanfordiceras'' is a strongly ribbed, evolute ammonite included in the perisphinctacean family, Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was r ... that lived during the latest Jurassic. The shell of ''Blanfordiceras'' is discoidal, with evolute coiling and all whorls visible so as to have a broad umbilicus. Exposed whorls are ornamented with strong ribbing that arises from the umbilicus, bifurcating on the outer flanks and extending onto the venter. In general form ''Blanfordiceras'' is similar to '' Berriasella'', although with a more rounded whorl section. References ;Notes ;Bibliography * {{Taxonbar, from=Q4925089 Cretaceous ammonites Ammonitida Fossils of Antarctica Tithonian life ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blanfordiceras Acuticosta
''Blanfordiceras'' is a strongly ribbed, evolute ammonite included in the perisphinctacean family, Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was r ... that lived during the latest Jurassic. The shell of ''Blanfordiceras'' is discoidal, with evolute coiling and all whorls visible so as to have a broad umbilicus. Exposed whorls are ornamented with strong ribbing that arises from the umbilicus, bifurcating on the outer flanks and extending onto the venter. In general form ''Blanfordiceras'' is similar to '' Berriasella'', although with a more rounded whorl section. References ;Notes ;Bibliography * {{Taxonbar, from=Q4925089 Cretaceous ammonites Ammonitida Fossils of Antarctica Tithonian life ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Edward Gray
John Edward Gray, FRS (12 February 1800 – 7 March 1875) was a British zoologist. He was the elder brother of zoologist George Robert Gray and son of the pharmacologist and botanist Samuel Frederick Gray (1766–1828). The same is used for a zoological name. Gray was keeper of zoology at the British Museum in London from 1840 until Christmas 1874, before the natural history holdings were split off to the Natural History Museum. He published several catalogues of the museum collections that included comprehensive discussions of animal groups and descriptions of new species. He improved the zoological collections to make them amongst the best in the world. Biography Gray was born in Walsall, but his family soon moved to London, where Gray studied medicine. He assisted his father in writing ''The Natural Arrangement of British Plants'' (1821). After being blackballed by the Linnean Society of London, Gray shifted his interest from botany to zoology. He began his zoologica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonitida
Ammonitida is an order of ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures. Ammonitida is divided into four suborders, the Phylloceratina, Lytoceratina, Ancyloceratina, and Ammonitina. The Phylloceratina is the ancestral stock, derived from the Ceratitida near the end of the Triassic. The Phylloceratina gave rise to the Lytoceratina near the beginning of the Jurassic which in turn gave rise to the highly specialized Ancyloceratina near the end of the Jurassic. Both the Phylloceratina and Lytoceratina gave rise to various stocks combined in the Ammonitina. These four suborders are further divided into different stocks, comprising various families combined into superfamilies. Some like the Hildoceratoidea and Stephanoceratoidea are restricted to the Jurassic. Others like the Hoplitoidea and Acanthoceratoidea are known only from the Cretaceous. Still others like the Perisphinctoidea are found in both. R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous Ammonites
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the Earth by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berriasella
''Berriasella'' is a discoidal evolute perisphinctacean ammonite, and type genus for the neocomitid subfamily Berriasellinae. Its ribbing is distinct, consisting of both simple and bifurcated ribs that extend from the umbilical seam across the venter; its whorl section generally compressed, the venter more or less narrowly rounded. The species ''Berriasella jacobi'' traditionally has been regarded an index fossil defining the base of the Cretaceous, however since 2016 this had been replaced by the first occurrence of ''Calpionella alpina''. Some authors regard ''B. jacobi'' as instead belonging to the genus '' Strambergella.'' ''Berriasella'', named by Uhlig, 1905, is known from the late Upper Jurassic, Tithonian, to the early Lower Cretaceous, Berriasian and has a fairly worldwide distribution. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neocomitidae
Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was regarded as the subfamily Neocomitinae within the Berriasellidae, a family within the Perisphinctoidea that ranged from the Late Jurassic into the Early Cretaceous. In a more recent treatment berriaselids are regarded as a subfamily within the Neocomitidae. Current opinion differers from the 1967 placement of Neocomitidae in the Perisphinctoidea but rather includes it in the superfamily Endemoceratoidea. Genera *''Acanthodiscus'' Uhlig, 1905 *''Argentiniceras'' Spath, 1924 *'' Berriasella'' Uhlig, 1905 *'' Decliveites'' Aguirre-Urreta and Rawson, 2010 *'' Delphinella'' Le Hegarat, 1973 *'' Delphinites'' Sayn, 1901 *'' Distoloceras'' Hyatt, 1900 *'' Elenaella'' Nikolov, 1966 *'' Eleniceras'' Breskovski, 1967 *'' Ellenaela'' Nikolov, 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perisphinctaceae
Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the venter. Classification Some 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan ''et al.'' 1981Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association. with modification from the Treatise on Invertebrate Paleontology, Part L (1957) *Perisphinctidae: Middle and Upper Jurassic root stock, derived from the Stephanoceratidae (Middle Jurassic direct derivatives of the Perisphinctidae) * Morphiceratidae * Tulitidae *Reineckeiidae *Pachyceratidae *Aspidoceratidae (early Upper Jurassic (Oxfordian) derivatives of Perisphinctidae) *Aulacostephanidae *Ataxioceratidae (mid Upper Jurassic (Kimmeridgian) derivatives of the Ataxioceratidae) * Dorsoplanitidae * V ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonite
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) than they are to shelled nautiloids such as the living ''Nautilus'' species. The earliest ammonites appeared during the Devonian, with the last species vanishing during the Cretaceous–Paleogene extinction event. Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often possible. Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found. The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder ( 79 AD near Pomp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blanfordiceras Wallichi
''Blanfordiceras'' is a strongly ribbed, evolute ammonite included in the perisphinctacean family, Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was r ... that lived during the latest Jurassic. The shell of ''Blanfordiceras'' is discoidal, with evolute coiling and all whorls visible so as to have a broad umbilicus. Exposed whorls are ornamented with strong ribbing that arises from the umbilicus, bifurcating on the outer flanks and extending onto the venter. In general form ''Blanfordiceras'' is similar to '' Berriasella'', although with a more rounded whorl section. References ;Notes ;Bibliography * {{Taxonbar, from=Q4925089 Cretaceous ammonites Ammonitida Fossils of Antarctica Tithonian life ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blanfordiceras Applanatum
''Blanfordiceras'' is a strongly ribbed, evolute ammonite included in the perisphinctacean family, Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was r ... that lived during the latest Jurassic. The shell of ''Blanfordiceras'' is discoidal, with evolute coiling and all whorls visible so as to have a broad umbilicus. Exposed whorls are ornamented with strong ribbing that arises from the umbilicus, bifurcating on the outer flanks and extending onto the venter. In general form ''Blanfordiceras'' is similar to '' Berriasella'', although with a more rounded whorl section. References ;Notes ;Bibliography * {{Taxonbar, from=Q4925089 Cretaceous ammonites Ammonitida Fossils of Antarctica Tithonian life ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blanfordiceras Tenuicostatum
''Blanfordiceras'' is a strongly ribbed, evolute ammonite included in the perisphinctacean family, Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was r ... that lived during the latest Jurassic. The shell of ''Blanfordiceras'' is discoidal, with evolute coiling and all whorls visible so as to have a broad umbilicus. Exposed whorls are ornamented with strong ribbing that arises from the umbilicus, bifurcating on the outer flanks and extending onto the venter. In general form ''Blanfordiceras'' is similar to '' Berriasella'', although with a more rounded whorl section. References ;Notes ;Bibliography * {{Taxonbar, from=Q4925089 Cretaceous ammonites Ammonitida Fossils of Antarctica Tithonian life ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blanfordiceras Subquadratum
''Blanfordiceras'' is a strongly ribbed, evolute ammonite included in the perisphinctacean family, Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was r ... that lived during the latest Jurassic. The shell of ''Blanfordiceras'' is discoidal, with evolute coiling and all whorls visible so as to have a broad umbilicus. Exposed whorls are ornamented with strong ribbing that arises from the umbilicus, bifurcating on the outer flanks and extending onto the venter. In general form ''Blanfordiceras'' is similar to '' Berriasella'', although with a more rounded whorl section. References ;Notes ;Bibliography * {{Taxonbar, from=Q4925089 Cretaceous ammonites Ammonitida Fossils of Antarctica Tithonian life ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
