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Desmoceratoidea
Desmoceratoidea, formerly Desmocerataceae, is a superfamily of Cretaceous ammonites, generally with round or oval-whorled shells that are mostly smooth or weakly ribbed and rarely tuberculate, but commonly with constrictions. a Paleobiology database retrieved on July 8, 2012. with and (1996), ''Mollusca 4 Revised , Cretaceous Ammonoidea'', vol. 4, in ''Treatise on Invertebrate Paleontology'', Part L (Roger L. Kaesler ed.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, 67-111. Regarded as monophyletic, the Desmocerataceae are derived from the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desmoceratidae
Desmoceratidae is a Family (biology), family belonging to the ammonite superfamily Desmoceratoidea. with and (1996), ''Mollusca 4 Revised , Cretaceous Ammonoidea'', vol. 4, in ''Treatise on Invertebrate Paleontology'', Part L (Roger L. Kaesler et el. eds.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, 69-71. a Paleobiology database retrieved on July 8, 2012. They are an extinction, extinct group of ammonite, ammonoids, shelled cephalopods related to squid, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids, that lived between the Lower Cretaceous (Upper Valanginian) and Upper Cretaceous (Upper Maastrichtian). Ref ...
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Holcodiscidae
Holcodiscidae is an ammonite family placed in the superfamily Desmoceratoidea. Wright, C. W. with J.H. Callomon and M.K. Howarth (1996), ''Mollusca 4 Revised, Cretaceous Ammonoidea'', vol. 4 in '''', Part L (Roger L. Kaesler et al. eds.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, p. 48. Description Moderately involute with rounded, rectangular, or depressed whorl section; straight or sinuous, fine, dense ribs typically continuing over venter and may be periodi ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonitina
Ammonitina comprises a diverse suborder of Ammonoidea, ammonite cephalopods that lived during the Jurassic and Cretaceous periods of the Mesozoic Era. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific Geologic time scale, geological time periods. The shells of Ammonitina are typically planospiral, coiled in a single plane and symmetrical from side to side. They come in various forms, including evolute shells where all whorls are exposed, and strongly involute shells with only the outer whorl visible. Shells may be heavily ribbed, with some featuring nodes and spines, while others are completely smooth. Some shells have broad, rounded venters (the outer rim), while others have a sharp, keel-like venter. Sutures are generally ammonitic, characterized by complex saddle and lobe patterns. However, in some derived forms, the suture pattern becomes simplified, appearing ceratitic or even goniatitic. The Ammonitina are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pachydiscidae
Pachydiscidae is a family of middle and upper Cretaceous ammonites in the superfamily Desmoceratoidea. Morphology Pachydiscidae species are moderate to large in size, evolute to rather involute, and vary in section from inflated and depressed to high-whorled and compressed. They are distinguished from the Desmoceratidae by strong ribbing at some growth stage, that normally crosses the venter uninterrupted, and by the tendency to develop strong tuberculation, at least on the umbilical shoulder. Pachydischidae evolved from Desmoceratidea, during the Lower Cenomanian, about the same time as the Kossmaticeratidae; however, they lived further into the Maastrichtian, virtually to the end of the Cretaceous. Genera * '' Anapachydiscus'' Yabe and Shimizu, 1926 * '' Baskaniceras'' Wright and Kennedy, 1984 * '' Canadoceras'' Spath, 1922 * '' Eopachydiscus'' Wright, 1955 * '' Eupachydiscus'' Spath, 1922 * '' Lewesiceras'' Spath, 1939 * '' Menuites'' Spath, 1922 * '' Nowakites'' * ''Pach ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silesitidae
Silesitidae is an ammonite family in the superfamily Desmoceratoidea. They lived during the Cretaceous, in the Barremian age. Taxonomy * '' Neoastieria'' * '' Piatnitzkyceras'' * '' Silesites'' * Silesitoidinae Distribution Fossils of species within this genus have been found in 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 ... sediments of Antarctica, France, Hungary, Italy, Mexico, Morocco, Slovakia, Spain. References Early Cretaceous first appearances Late Cretaceous extinctions Desmoceratoidea Ammonitida families {{Ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phylloceratidae
Phylloceratidae is the predominant family of the Phylloceratina with some 15 or more genera found in rocks ranging from the Lower Jurassic to the Upper Cretaceous. Members of the Phylloceratidae are characterized by smooth, involute shells with very thin walls. Many are covered with fine growth lines but are usually without ribbing. Sutures are complex with the major and minor branches of the saddles with phylloid or spatulate endings.Treatise on Invertebrate Paleontology Part L Mollusca 4, Ammonoidea, 1957 Evolution and phylogeny The Phylloceratidae are probably derived from the Late Triassic Discophyllitidae by increasing the sutural complexity and evolving involute coiling. The Discophyllitidae in turn have their origin in the Ussuritidae, also known as the Monophyllitidae. The Phylloceratidae gave rise at or near the beginning of the Jurassic to the ancestral Lytoceratina, the early Lower Jurassic Peluroacanthitidae and Ectocentridae. The Phyloceratidae also gave rise at or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kossmaticeratidae
Kossmaticeratidae is an extinct ammonoid family belonging to the order Ammonitida. Subfamilies and genera Kossmaticeratidae includes two subfamilies and eight genera: * Kossmaticeratinae Spath, 1922 ** '' Grossouvrites'' Kilian and Reboul, 1909 ** '' Gunnarites'' Kilian and Reboul, 1909 ** '' Kossmaticeras'' de Grossouvre, 1901 ** '' Maorites'' Marshall, 1926 ** '' Pseudokossmaticeras'' Spath, 1922 * Marshallitinae Matsumoto, 1955 ** '' Eomarshallites'' Medina and Rinaldi, 1986 ** '' Marshallites'' Matsumoto, 1955 ** '' Yokoyamaoceras'' Wright and Matsumoto, 1954 Distribution Fossils of members within this family have been found in the Cretaceous sediments of Antarctica, Argentina, Australia, Austria, Belgium, Canada, Chile, France, India, Japan, Madagascar, New Zealand, South Africa, United States as well as in the Jurassic of the United Kingdom. References * Arkell ''et al.'', 1957. Mesozoic Ammonoidea, L374; Treatise on Invertebrate Paleontology The ''Treatise on Inver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valanginian
In the geologic timescale, the Valanginian is an age or stage of the Early or Lower Cretaceous. It spans between 137.05 ± 0.2 Ma and 132.6 ± 0.2 Ma (million years ago). The Valanginian Stage succeeds the Berriasian Stage of the Lower Cretaceous and precedes the Hauterivian Stage of the Lower Cretaceous. Stratigraphic definitions The Valanginian was first described and named by Édouard Desor in 1853. It is named after Valangin, a small town north of Neuchâtel in the Jura Mountains of Switzerland. The base of the Valanginian is at the first appearance of calpionellid species '' Calpionellites darderi'' in the stratigraphic column. A global reference section (a GSSP) had in 2009 not yet been appointed. The top of the Valanginian (the base of the Hauterivian) is at the first appearance of the ammonite genus '' Acanthodiscus''. Subdivision The Valanginian is often subdivided in Lower and Upper substages. The Upper substage begins at the first appearance of ammonite speci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonitida Superfamilies
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] |
Claud William Wright
Claud William Wright CB FGS (9 January 1917, Ellenborough, Yorkshire, England – 15 February 2010, Burford, Oxfordshire, England), Aka Willy Wright, was a senior British civil servant who was also an expert in the disciplines of geology, palaeontology, and archaeology. Life He was educated at Charterhouse and Christ Church, Oxford. At Oxford, he was influenced by the geologist W. J. Arkell, an interest that became a serious hobby. His professional career was in the War Office/Ministry of Defence, where he reached the rank of Deputy Secretary. In 1971, he transferred to the Ministry of Education and there was involved with the establishment of the first Ministry of Arts. In these posts, he worked directly with Margaret Thatcher and Lord Eccles. It was in Wright's hobbies where he made his greatest mark. Whilst working as a civil servant he was, between 1956 and 1958, President of the Geologists' Association, but after he "retired" in 1976 he could devote his time to h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superfamily (biology)
In biology, taxonomic rank (which some authors prefer to call nomenclatural rank because ranking is part of nomenclature rather than taxonomy proper, according to some definitions of these terms) is the relative or absolute level of a group of organisms (a ''taxon'') in a hierarchy that reflects evolutionary relationships. Thus, the most inclusive clades (such as Eukarya and Animalia) have the highest ranks, whereas the least inclusive ones (such as ''Homo sapiens'' or '' Bufo bufo'') have the lowest ranks. Ranks can be either relative and be denoted by an indented taxonomy in which the level of indentation reflects the rank, or absolute, in which various terms, such as species, genus, family, order, class, phylum, kingdom, and domain designate rank. This page emphasizes absolute ranks and the rank-based codes (the Zoological Code, the Botanical Code, the Code for Cultivated Plants, the Prokaryotic Code, and thCode for Viruses require them. However, absolute ranks are not r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
