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Cairanoolithus
''Cairanoolithus'' is an oogenus of dinosaur egg which is found in Southwestern Europe. The eggs are large ( in diameter) and spherical. Their outer surface is either smooth, or covered with a subdued pattern of ridges interspersed with pits and grooves. Multiple fossil egg clutches are known but the nest structure is unclear. The parent of ''Cairanoolithus'' is probably some kind of non-ornithopod ornithischian, possibly the nodosaurid ''Struthiosaurus''. The eggs were first named in 1994, when the two oospecies were classified in distinct oogenera as ''Cairanoolithus dughii'' and ''Dughioolithus roussetensis''. They are now considered to belong in a single oogenus, possibly even a single oospecies. Though it has been classified as a megaloolithid, ''Cairanoolithus'' is now placed in its own oofamily, Cairanoolithidae. Description ''Cairanoolithus'' eggs are spherical and fairly large, measuring in diameter. The outer surface is smooth or covered with a subdued netlik ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cairanoolithus Scale
''Cairanoolithus'' is an oogenus of dinosaur egg which is found in Southwestern Europe. The eggs are large ( in diameter) and spherical. Their outer surface is either smooth, or covered with a subdued pattern of ridges interspersed with pits and grooves. Multiple fossil egg clutches are known but the nest structure is unclear. The parent of ''Cairanoolithus'' is probably some kind of non-ornithopod ornithischian, possibly the nodosaurid ''Struthiosaurus''. The eggs were first named in 1994, when the two oospecies were classified in distinct oogenera as ''Cairanoolithus dughii'' and ''Dughioolithus roussetensis''. They are now considered to belong in a single oogenus, possibly even a single oospecies. Though it has been classified as a megaloolithid, ''Cairanoolithus'' is now placed in its own oofamily, Cairanoolithidae. Description ''Cairanoolithus'' eggs are spherical and fairly large, measuring in diameter. The outer surface is smooth or covered with a subdued netlik ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oogenus
Egg fossils are the fossilized remains of eggs laid by ancient animals. As evidence of the physiological processes of an animal, egg fossils are considered a type of trace fossil. Under rare circumstances a fossil egg may preserve the remains of the once- developing embryo inside, in which case it also contains body fossils. A wide variety of different animal groups laid eggs that are now preserved in the fossil record beginning in the Paleozoic. Examples include invertebrates like ammonoids as well as vertebrates like fishes, possible amphibians, and reptiles. The latter group includes the many dinosaur eggs that have been recovered from Mesozoic strata. Since the organism responsible for laying any given egg fossil is frequently unknown, scientists classify eggs using a parallel system of taxonomy separate from but modeled after the Linnaean system. This "parataxonomy" is called ''veterovata''. History The first named oospecies was '' Oolithes bathonicae'', a name given provisi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Struthiosaurus
''Struthiosaurus'' (Latin ''struthio'' = ostrich + Greek ''sauros'' = lizard) is a genus of nodosaurid dinosaurs, from the Late Cretaceous period (Santonian-Maastrichtian) of Austria, Romania, France and Hungary in Europe.''Struthiosaurus'' in The Dinosaur Encyclopaedia at Dino Russ's Lair It was a small dinosaur, measuring in length and weighing . History of discovery In 1859, geologist at the ''Gute Hoffnung'' coal mine at Muthmannsdorf near |
Dinosaur Egg
Dinosaur eggs are the organic vessels in which a dinosaur embryo develops. When the first scientifically documented remains of non-avian dinosaurs were being described in England during the 1820s, it was presumed that dinosaurs had laid eggs because they were reptiles. In 1859, the first scientifically documented dinosaur egg fossils were discovered in France by Jean-Jacques Poech, although they were mistaken for giant bird eggs (birds were not yet recognized as dinosaurs at the time). The first scientifically recognized non-avian dinosaur egg fossils were discovered in 1923 by an American Museum of Natural History crew in Mongolia. Dinosaur eggshell can be studied in thin section and viewed under a microscope. The interior of a dinosaur egg can be studied using CAT scans or by gradually dissolving away the shell with acid. Sometimes the egg preserves the remains of the developing embryo inside. The oldest known dinosaur eggs and embryos are from ''Massospondylus'', which lived ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the Latin word for the white limestone known as chalk. The chalk of northern France and the white cliffs of south-eastern England date from the Cretaceous Period. Climate During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident. The tropics became restricted to equatorial regions and northern latitudes experienced markedly more seasonal climatic conditions. Geography Due to plate tectonics, the Americas were gradually moving westward, causing the Atlantic Ocean to expand. The Western Interior Seaway divided North America into eastern and western halves; Appalachia and Laramidia. India maintained a northward course towards Asia. In the Southern Hemisphere, Australia and Ant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guegoolithus
''Guegoolithus'' is an oogenus of fossil egg from the early Cretaceous of Spain. It is classified in the oofamily Spheroolithidae, and was probably laid by an ornithopod dinosaur. Distribution ''Guegoolithus'' is known from the Early Cretaceous of Spain. It is common in the Maestrazgo Basin, dating to the lower Barremian. Fossils have been found in the Blesa, El Castellar, Camarillas, and Mirambel Formations. It has also been found at the slightly older El Hocajo, a part of the Cameros Basin which dates to the Valanginian or Hauterivian ages, up to 7 million years older than the Maestrazgo specimens. Description ''Guegoolithus'' is known from over 400 fossil eggshell fragments, but no complete eggs have been found. They are very thin for spheroolithids, ranging from 0.42 to 1.5 mm in thickness.Moreno-Azanza, M., J.I. Canudo, and J.M. Gasca. (2014)Spheroolithid eggshells in the Lower Cretaceous of Europe. Implications for eggshell evolution in ornithischian dinosaurs. ''C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spheroolithus
''Spheroolithus'' is an oogenus of dinosaur egg.Wang Q, Wang X L, Zhao Z K, and Jiang Y G. (2012).A new oofamily of dinosaur egg from the Upper Cretaceous of Tiantai Basin, Zhejiang Province, and its mechanism of eggshell formation Chinese Science Bulletin. 57: 3740-3747. doi: 10.1007/s11434-012-5353-2 Oospecies The following species are described:''Spheroolithus'' in the * ''Paraspheroolithus sanwangbacunensis'' * ''Paraspheroolithus yangchengensis'' * ''Spheroolithus albertensis'' * ''Spheroolithus choteauensis'' * ''Spheroolithus europaeus'' * ''Spheroolithus irenensis'' * ''Spheroolithus jincunensis'' * ''Spheroolithus maiasauroides'' * ''Spheroolithus meg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ovaloolithus
''Ovaloolithus'' is an oogenus of dinosaur egg. Eggs of the genus have been found in China, Mongolia and Utah. Species Oospecies attributed to this genus include:''Ovaloolithus'' in the * ''O. chinkangkouensis'' - - , Mongolia, |
Monotypic
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. In contrast, an oligotypic taxon contains more than one but only a very few subordinate taxa. Examples Just as the term ''monotypic'' is used to describe a taxon including only one subdivision, the contained taxon can also be referred to as monotypic within the higher-level taxon, e.g. a genus monotypic within a family. Some examples of monotypic groups are: Plants * In the order Amborellales, there is only one family, Amborellaceae and there is only one genus, '' Amborella'', and in this genus there is only one species, namely ''Amborella trichopoda. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraphyly
In taxonomy, a group is paraphyletic if it consists of the group's last common ancestor and most of its descendants, excluding a few monophyletic subgroups. The group is said to be paraphyletic ''with respect to'' the excluded subgroups. In contrast, a monophyletic group (a clade) includes a common ancestor and ''all'' of its descendants. The terms are commonly used in phylogenetics (a subfield of biology) and in the tree model of historical linguistics. Paraphyletic groups are identified by a combination of synapomorphies and symplesiomorphies. If many subgroups are missing from the named group, it is said to be polyparaphyletic. The term was coined by Willi Hennig to apply to well-known taxa like Reptilia ( reptiles) which, as commonly named and traditionally defined, is paraphyletic with respect to mammals and birds. Reptilia contains the last common ancestor of reptiles and all descendants of that ancestor, including all extant reptiles as well as the extinct synapsids, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sauropod
Sauropoda (), whose members are known as sauropods (; from '' sauro-'' + '' -pod'', 'lizard-footed'), is a clade of saurischian ('lizard-hipped') dinosaurs. Sauropods had very long necks, long tails, small heads (relative to the rest of their body), and four thick, pillar-like legs. They are notable for the enormous sizes attained by some species, and the group includes the largest animals to have ever lived on land. Well-known genera include ''Brachiosaurus'', ''Diplodocus'', ''Apatosaurus'' and ''Brontosaurus''. The oldest known unequivocal sauropod dinosaurs are known from the Early Jurassic. ''Isanosaurus'' and ''Antetonitrus'' were originally described as Triassic sauropods, but their age, and in the case of ''Antetonitrus'' also its sauropod status, were subsequently questioned. Sauropod-like sauropodomorph tracks from the Fleming Fjord Formation (Greenland) might, however, indicate the occurrence of the group in the Late Triassic. By the Late Jurassic (150 million yea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Megaloolithus
''Megaloolithus'' is an oogenus of dinosaur egg. Some eggs belonging to this oogenus may have been laid by the titanosaur ''Hypselosaurus''. They are known for having thick eggshells, at least thick, and the nearly spherical shape of the eggs. They are primarily found in India and Europe, but some specimens have been found in South America. Species * ''M. aureliensis'' * ''M. baghensis'' * ''M. cylindricus'' * ''M. dhoridungriensis'' * ''M. jabalpurensis'' * ''M. khempurensis'' * ''M. mamillare'' * ''M. megadermus'' * ''M. microtuberculata'' * ''M. mohabeyi'' * ''M. petralta'' * ''M. problematica'' * ''M. siruguei'' * ''M. trempii'' * ''M. patagonicus'' Distribution Fossils of ''Megaloolithus'' have been found in:''Megaloolithus'' at |
