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Acanthoceratoidea
Acanthoceratoidea, formerly Acanthocerataceae, is a superfamily of Upper Cretaceous ammonoid cephalopods belonging to the order Ammonitida, and comprising some 10 or so families.W.J Arkell ''et al''., Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Ammonoidea. 1957 Diagnosis Members of the Acanthoceratoidea are typically strongly ribbed and have a tendency to develop prominent tubercles, although other types including those with oxyconic shells are included. Taxonomy Families included in the Acanthoceratoidea are: * Acanthoceratidae * Brancoceratidae * Coilopoceratidae * Collignoniceratidae * Flickiidae * Lyelliceratidae Lyelliceratidae is a family of ammonites belonging to the superfamily Acanthoceratoidea. These cephalopods were fast-moving nektonic carnivores. They lived in the Cretaceous period (109.0 to 94.3 Ma). Genera *''Lyelliceras'' Spath, 1921 *'' Ps ... * Sphenodiscidae * Tissotiidae * Vascoceratidae Discussion According to Wright Call ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonitina
Ammonitina comprises a diverse suborder of 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 geological time periods. The shells of Ammonitina are typically planospiral; coiled in a plane, symmetrical side to side. Shells vary in form, including those that are evolute, such that all whorls are exposed, and those that are strongly involute with only the outer whorl showing. They may be strongly ribbed, some bearing nodes and spines; others are entirely smooth. Some have broad rounded venters (the outer rim); in others the venter is sharp and keel-like. Sutures are generally ammonitic, with intricately patterned saddle and lobes. However, in some derived forms the suture becomes simplified, ceratitic, even goniatitic. The Ammonitina are derived from the Phylloceratina, another ammonitid suborder which has its origin in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lyelliceratidae
Lyelliceratidae is a family of ammonites belonging to the superfamily Acanthoceratoidea. These cephalopods were fast-moving nektonic carnivores. They lived in the Cretaceous period (109.0 to 94.3 Ma). Genera *''Lyelliceras'' Spath, 1921 *'' Pseudobrancoceras'' Kennedy, 2004 *'' Tegoceras'' Hyatt, 1903 *'' Budaiceras'' Böse, 1928 *'' Cenisella'' Delamette and Latil, 1989 *'' Neophlycticeras'' Spath, 1922 *'' Ojinagiceras'' Cobban and Kennedy, 1989 *'' Paracalycoceras'' *'' Stoliczkaia'' Neumayr, 1875 *''Zuluscaphites ''Zuluscaphites'' is an extinct genus of cephalopod belonging to the 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, ar ...'' Van Hoepen, 1955 References Ammonitida families Acanthoceratoidea Cretaceous ammonites Albian first appearances Cenomanian extinctions {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leymeriellidae
Leymeriellidae is a family of Lower Cretaceous ammonites comprising rather small forms distinguished from Hoplitidae by their flattened and grooved ribs and virtual absence of umbilical tubercles. The family is derived from the Desmoceratidae. '' Leymeriella schrammeni anterior'' has evolved from '' Desmoceras keilhacki keilhacki''.BERT, D. Les ammonites du niveau Paquier (Albien basal, Crétacé inférieur) du Sud-Est de la France. Fossiles, 2012, 12: 4-25. Taxonomic position Leymeriellidae are currently regarded is belonging to the Acanthoceratoidea according to W. J. Kennedy ''et al'' (1980). The previous placement was in the Hoplitoidea according to W.J. Arkell ''et al'' (1957) in the '' Treatise on Invertebrate Paleontology, Part L''. Genera Leymeriellidae includes the following genera: *'' Leymeriella'' Jacob 1907. Shell evolute, venter flat to sulcate. Ribs single, wide spaced, grooved in outer part. ''Lower Albian to Middle Albian The Albian is both an age of the g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthoceratidae
Acanthoceratidae is an extinct family of acanthoceratoid cephalopods in the order Ammonitida, known from the Upper Cretaceous. The type genus is '' Acanthoceras''. Diagnosis Acanthoceratidae species are strongly tuberculate with at least umbilical and ventrolateral tubercles in most genera included. Ribs are dominant in some, in others weak or absent on the outer whorls. Most are evolute, compressed to very depressed in section. Sutures are ammonitic with little variation, but showing a tendency for simplication in later genera. Taxonomy Acanthoceratidae de Grossouvre, 1894 includes the following subfamilies. * Acanthoceratinae de Groussouvre, 1894 *Euomphaloceratinae Euomphaloceratinae is a subfamily of Upper Cretaceous ammonites included in the Acanthoceratidae, characterized by generally evolute shells with quadrate whorl sections that are strongly ribbed. Sutures are ammonitic, but not overly complex. Gen ... Cooper, 1978 * Mammitinae (Hyatt, 1900) (= Fallotitinae Wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brancoceratidae
Brancoceratidae is a family of Acanthoceratoidea, acanthoceratoid Ammonitina, ammonites from the middle of the Cretaceous, recognized by their commonly evolute shells with round, oval, or quadrate whorls, strong ribs, usual ventral keels, and at least, umblical tubercles. The family is thought to be derived from the Desmoceratidae (Desmoceratoidea), perhaps from ''Silesitoides'' or some allied genus. Subfamilies The Brancoceratidae are divided into three subfamilies, described as follows. Brancoceratinae Spath, 1933: Generally small, evolute with round, oval, square or rectangular whorl sections. The venter may be sharp on the inner whorls, a feature which disappears on the later. Ribs are strong and rounded, and commonly cross over the venter. Sutures are simple, pseudoceratitc in some. The subfamily lived from during the Albian. Mojsisovicziinae Hatt, 1903: derived from the Broncoceratinae, beginning with ''Mojsisoviczia'', in which the keel has become a stable character, i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collignoniceratidae
Collignoniceratidae is a family of Upper Cretaceous ammonites characterized by typically more or less evolute shells with compressed, oval, or square whorl sections; serrate or entire keels; and dense ribs with one to 5 tubercles. Taxonomy This family, named by Wright and Wright in 1951, is divided into four subfamilies; Collignoniceratinae, Barroisiceratinae, Peroniceratinae, and Texanitinae. The family is included in the large ammonitid superfamily Acanthoceratoidea which lasted until the end of the Cretaceous. The Collignoniceratidae are derived from the Acanthoceratidae, first appearing early in the Turonian (early U Cret) and lasting until the mid Campanian (late U Cret), a span of some 20 million years Collignoniceratidae Wright & Wright, 1951 (synonyms - Prionocyclidae Breistroffer, 1947; Prionotropidae Zittel, 1865) *Subfamily Barroisiceratinae Basse, 1947 **Genus ''Barroisiceras'' de Grossouvre, 1894 **Genus ''Forresteria'' (Reeside, 1932) **Genus '' Solgerites'' Re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flickiidae
Flickiidae is a family of dwarf ammonites with little ornament and very simples sutures known from small pyritic specimens found in middle Cretaceous deposits. Inclusion in the Acanthoceratoidea is tentative. Taxonomy Flickiidae has been divided into two subfamilies, the Flickiinae, which is equivalent to the Flickiidae of the Treatise on Invertebrate Paleontology, Part L, 1957 and the Salaziceratinae which contains ''Salaziceras'', moved from the Lyelliceratidae and ''Neosaynoceras'', moved from the Acanthoceratidae. Genera now in the Flickiinae: :''Flickia'' Pervenquiere, 1907 - Shell smooth, moderately evolute, rather compressed, venter narrowly arched, suture smooth, undulatory. U Alb -L Cenom. N Afr, Madag, Texas. :'' Ficheuria'' Pervenquiere, 1907 - Shell very involute, globular, umbilical shoulder tending to be angular. Suture similar to that of Flickia. U Alb. -L Cenom. of North Africa. :''Adkinsia ''Adkinsia'' is an extinct genus of cephalopod belonging to the Ammon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tissotiidae
Tissotiidae is a family of ammonites (Ammonitina) belonging to the Acanthoceratoidea. The Tissotiidae are derived from the Vascoceratidae, another acanthoceratoid family, and gave rise to the Coilopoceratidae. They have been divided into two subfamilies, the earlier and more primitive Pseudotissotiinae and the more advanced and later Tissotiinae, which differ only in the details of the suture. (ibid) Genera Genera within the family Tissotiidae include: *'' Heterotissotia'' Peron, 1897 *'' Metatissotia'' *'' Paratissotia'' *''Tissotia'' Douvillé, 1890 *'' Tissotioides'' Reyment, 1958 Description Members (genera) of the Tissotiidae tend to have smooth, strongly involute shells with deeply impressed inner rims to the whorls where subsequent whorls wrap around those prior. Shells may be narrow and discoidal, broad and subspheroidal, or in between. Sides commonly have broad ribs, and on some, tubercles. The outer rim, known as the venter, may be wide and nearly flat, rounded, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vascoceratidae
The Vascoceratidae is a family of Upper Cretaceous ammonites in the superfamily Acanthoceratoidea characterized by shells that are either smooth or bluntly tuberculate, or have sparse, coarse ribs. Sutural elements are shallow, irregular, and slightly indented, or deep and very indented. Whorl section and degree of involution vary, even within species. The Vascoceratidae is a short lived family restricted to the early and middle Turonian stage. Its duration, no more than a few million years. They are derived from the Acanthoceratidae and are the predecessors of the Tissotiidae Tissotiidae is a family of ammonites (Ammonitina) belonging to the Acanthoceratoidea. The Tissotiidae are derived from the Vascoceratidae, another acanthoceratoid family, and gave rise to the Coilopoceratidae. They have been divided into two s ..., which in turn gave rise to the Coilopoceratidae; all taking place in a short time span in the Turonian. Ammonitida families Acanthoceratoidea Turoni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonitida Superfamilies
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 bot ... [...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 Perisphin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |