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Parvoblongoolithus
''Parvoblongoolithus'' is an oogenus of fossil dinosaur egg whose small size and unusual shape suggest the possibility that it is a dwarf egg. Distribution The sole known ''Parvoblongoolithus jinguoensis'' specimen was found in the Upper Cretaceous Chichengshan Formation in Tiantai County, Zhejiang. Description ''Parvoblongoolithus'' known from only a single specimen. It is relatively small (measuring long by wide) with an asymmetrical shape, similar to modern bird eggs. The eggshell is 1.12 mm thick, with the barrel-shaped cones of the mammillary layer making up one-fifth of the total eggshell thickness. The pore system is prolatocanaliculate, meaning the pores vary in width along their length. The pore canals are thick and irregularly shaped. The outer surface of the eggshell is smooth. Despite having a bird-like shape and size, the ''P. jinguoensis'' has a very different microstructure, which bears a closer resemblance to non-avian dinosaur eggs than bird eggs. Most sig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stalicoolithidae
Stalicoolithidae is an oofamily of fossil eggs.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 History Stalicoolithid eggs were first discovered in 1971, but they were described initially as Dendroolithids,Zhang, S., X. Jin, J.K. O'Conner, M. Wang, and J. Xie. (2015). "A new egg with avian egg shape from the Upper Cretaceous of Zhejiang Province, China." ''Historical Biology'' 27(5):595-602. or as Spheroolithids, in the case of ''"Paraspheroolithus" shizuiwanensis'' and '' Shixingoolithus''. Description Stalicoolithids are distinguished from other oofamilies by several characteristics. Most significantly, they have secondary eggshell units in the outer zone, and three distinct subzones of the columnar layer. They have a unique mix of developmental characteristics, giving ... [...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] |
Dinosauroid-spherulitic
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 pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cock Egg
A yolkless egg is a small egg with no yolk, sometimes produced by a pullet that has only just started laying. These eggs are common and usually pose no harm. The eggs can also be called fart eggs, cock eggs, fairy eggs, dwarf eggs, and witch eggs. The name wind eggs is also sometimes used, but this term more often refers to eggs without a shell, or with a soft shell, and less often to eggs that are rotten or unfertilized.Oxford Universal Dictionary Cause A yolkless egg is most often a pullet's first egg, produced before her laying mechanism is fully ready. In a mature hen, a yolkless egg is unlikely, but can occur if a bit of reproductive tissue breaks away, stimulating the egg-producing glands to treat it as a yolk and wrap it in albumen, membranes and a shell as it travels through the egg tube. In cases of an egg that contains a small particle of grayish tissue instead of a yolk, this is what has occurred. This type of egg occurs in many varieties of fowl, including chickens (bot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maastrichtian
The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from . The Maastrichtian was preceded by the Campanian and succeeded by the Danian (part of the Paleogene and Paleocene). The Cretaceous–Paleogene extinction event (formerly known as the Cretaceous–Tertiary extinction event) occurred at the end of this age. In this mass extinction, many commonly recognized groups such as non-avian dinosaurs, plesiosaurs and mosasaurs, as well as many other lesser-known groups, died out. The cause of the extinction is most commonly linked to an asteroid about wide colliding with Earth, ending the Cretaceous. Stratigraphic definitions Definition The Maastrichtian was introduced into scientific literature by Belgian geologist André Hubert Dumont in 1849, after studying rock strata of the Chalk Group c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil Parataxa Described In 2015
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the absolu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titanosaur
Titanosaurs (or titanosaurians; members of the group Titanosauria) were a diverse group of sauropod dinosaurs, including genera from all seven continents. The titanosaurs were the last surviving group of long-necked sauropods, with taxa still thriving at the time of the extinction event at the end of the Cretaceous. This group includes some of the largest land animals known to have ever existed, such as ''Patagotitan''—estimated at long with a weight of —and the comparably-sized ''Argentinosaurus'' and ''Puertasaurus'' from the same region. The group's name alludes to the mythological Titans of ancient Greek mythology, via the type genus (now considered a '' nomen dubium)'' ''Titanosaurus''. Together with the brachiosaurids and relatives, titanosaurs make up the larger sauropod clade Titanosauriformes. Titanosaurs have long been a poorly-known group, and the relationships between titanosaur species are still not well-understood. Description Titanosauria have the largest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dinosaur
Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 mya; their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record shows that birds are feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic epoch, and are the only dinosaur lineage known to have survived the Cretaceous–Paleogene extinction event approximately 66 mya. Dinosaurs can therefore be divided into avian dinosaurs—birds—and the extinct non-avian dinosaurs, which are all dinosaurs other than birds. Dinosaurs are varied from taxonomic, morphological and ecological standpoints. Birds, at over 10,700 living species, are among ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bird
Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the bee hummingbird to the ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. Birds have whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which are modified forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming. B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraspheroolithus
''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 Paleobiology Database * ''Paraspheroolithus sanwangbacunensis'' * ''Paraspheroolithus yangchengensis'' * ''Spheroolithus albertensis'' * ''Spheroolithus choteauensis'' * ''Spheroolithus europaeus'' * ''Spheroolithus irenensis'' * ''Spheroolithus jincunensis'' * ''Spheroolithus maiasauroides'' * ''Spheroolithus megadermus'' * ''Spheroolithus spheroides'' * ''Spheroolithus tenuicorticus'' Distribution Fossils of the oogenus were ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mosaicoolithus
''Mosaicoolithus'' is an oogenus of fossil egg from the Cenomanian Chichengshan Formation ( Tiantai Group) and Albian to Cenomanian Laijia Formation ( Qujiang Group) of Tiantai County, Zhejiang Province in China. Its classification is uncertain. The eggs are spherical, and 8.8 cm in diameter. It is distinctive for having irregular pore canals, sometimes filled by secondary shell units. Originally, it was classified as two separate oospecies of ''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 Scienc ...'': ''S. zhangtoucaoensis'' and ''S. jincunensis''. However, these oospecies were synonymized and placed into a new oogenus by Wang ''et al.'' (2011).Wang Qiang, Zhao Zi-kui, Wang Xiao-lin, and Jiang Yan-gen. (2011) "New ootypes of dinosaur eggs from the Late Cretaceous in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laevisoolithidae
Laevisoolithidae is an oofamily of fossil eggs belonging to the Ornithoid-ratite morphotype. Their eggshells are smooth and very thin, typically less than a millimeter thick. Laevisoolithids may be the eggs of Enantiornithid birds.K. E. Mikhailov. 1991. Classification of fossil eggshells of amniotic vertebrates. Acta Palaeontologica Polonica 36(2):193-238 Eggs of the family were found in the Grès à Reptiles Formation Grès was a French haute couture fashion house founded by Madame Grès in 1942. Parfums Grès is the associated perfume house, which still exists, and is now based in Switzerland. History Germaine Émilie Krebs (1903–1993), known as Alix Bar ... of France and the Nemegt Formation of Mongolia. References Egg fossils {{eggshell-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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