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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] |
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] |
Allocrioceras
''Allocrioceras'' is an ammonoid cephalopod from the Turonian to Santonian stages of the Late Cretaceous, included in the turrilitoid family Anisoceratidae. Its shell is strongly ribbed and is in the form of a widely open spiral. Classification After its 1907 discovery, the species ''A. hazzardi'' was erroneously classified as '' Crioceras latus'' by Udden. A later 1928 revision by Adkins removed it from the species ''C. latus'' while keeping it as a member of the genus ''Crioceras''. In 1963, Young gave the species its final classification in a new genus, ''Allocrioceras'', originally defined by Spath in 1926. Biology ''Allocrioceras'' was small compared to some Ammonites. Its shell diameter was only a bit larger than an U.S. quarter. Unlike most Ammonites its shell was partially uncoiled. Ammonites like this, with shell configurations differing from the typical tightly coiled spiral, are called heteromorphs. It lived approximately 88 million years before present during th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anisoceras
''Anisoceras'' is a heteromorph ammonite belonging to the turrilitoid family 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 deriv .... The shell forms a loose open helical spiral in the early stages, ending in one or two straight shafts in the mature adult. Surface ornament consists of prominent rounded nodes on the lower and upper flanks, connected by strong looped ribs. The nodes may have been the bases of long sharp spines. References * *Marcinowski and Wiedmann. The Albian Ammonites of Poland. Palaeontologia Polonica no. 50, 1990 The Paleobiology Database ''Anisoceras'' entry Ammonitida genera Cretaceous ammonites Ammonites of Australia Albian genus first appearances Turonian genus extinctions Cenomanian genera Fossil taxa described in 1854 Turrilitoidea [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mosirites
''Mosirites'' is a genus of anisoceratid ammonite from Hobetsu in Hokkaido; North Japan. The type species is ''Mosirites mirabilis'', known from multiple partial and complete specimens. Description ''Mosirites'' is known from multiple specimens which were described in 2023 by Shigeta ''et al''., (2023). The holotype, HMG-2412 has a maximum diameter of , and consists of a phragmocone and a part of the body chamber with length of about 150°. Etymology The generic name, ''Mosirites'', is derived from the Ainu word for peaceful land or 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 ..., and the suffix "-ites" which is common in ammonite genera. The type species' specific name, ''mirabilis'', is a Latin word for amazing, and refers to its amazing and wonderful form. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algerites
''Algerites'' is middle Cretaceous (Cenomanian) anisoceratid ammonoid with a close-coiled adult shell in which the whorls at that stage are in close contact, after starting off with openly coiled whorls, and in which every rib (a character of the family) has a pair of sharp ventral tubercles. ''Algerites'', which is found in North Africa, named for the country of Algeria, is thought to be derived from ''Idiohammites'', also an anisoceratid. It (''Algerites'') differs from ''Allocrioceras'' in that the later whorls come together in close contact where as in the latter they remain apart. The Anisoceratidae to which this genus is assigned is included in the diverse heteromorphic superfamily 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, am .... References * Arkell ''et a ... [...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 Exoskeleton, 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alpheus Hyatt
Alpheus Hyatt (April 5, 1838 – January 15, 1902) was an American zoologist and palaeontologist. Hyatt served as the founding president of the American Society of Naturalists from 1883 to 1884 and was the founding editor of the journal '' The American Naturalist''. A student of Louis Agassiz, he was keenly involved in developing biology research and education and helped establish the Marine Biological Laboratory at Woods Hole. Biography Alpheus Hyatt II was born in Washington, D.C. to Alpheus Hyatt and Harriet Randolph (King) Hyatt. He briefly attended the Maryland Military Academy and Yale University, and after graduating from Harvard University in 1862, he enlisted as a private in the Massachusetts Volunteer Infantry for the Civil War, emerging with the rank of captain. After the war he worked for a time at the Essex Institute (now the Peabody Essex Museum in Salem, Massachusetts. He and a colleague founded '' American Naturalist'' and Hyatt served as editor from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonitida Families
Ammonitida, or true ammonites, are 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 Perisphincto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous Ammonites
The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 77.1 million years, it is the ninth and longest geological period of the entire Phanerozoic. The name is derived from the Latin , 'chalk', which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation . 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 largely ice-free, although there is some evidence of brief periods of glaciation during the cooler first half, and forests extended to the poles. Many of the dominant taxonomic groups present in modern times can be ultimately traced back to origins in the ... [...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,'' 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 ... shows with a separate and later derivation from the Lytoceratidae. Ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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-authored work of currently 55 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and extant (still living) invertebrate animals. The prehistoric invertebrates are described as to their taxonomy, morphology, paleoecology, stratigraphic and paleogeographic range. However, taxa with no fossil record whatsoever have just a very brief listing. Publication of the decades-long ''Treatise on Invertebrate Paleontology'' is a work-in-progress; and therefore it is not yet complete: For example, there is no volume yet published regarding the post- Paleozoic era caenogastropods (a molluscan group including the whelk and periwinkle). Furthermore, when needed, previously published vol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hamitidae
''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 descript ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
