|
Euclastes
''Euclastes'' is an extinct genus of sea turtles that survived the Cretaceous–Paleogene mass extinction. The genus was first named by Edward Drinker Cope in 1867, and contains three species. ''E. hutchisoni'', was named in 2003 but has since been reassigned to the genus ''Pacifichelys'', while ''E. coahuilaensis'' named in 2009 was reassigned as '' Mexichelys coahuilaensis'' in 2010. Description Unlike the sea turtles ''Toxochelys'' and ''Eochelone'', ''Euclastes'' has a secondary palate. However, the secondary palate of ''Euclastes'' is not as extensive as it is in ''Ctenochelys'' and ''Angolachelys''. The genus can be distinguished by later sea turtles based on its broad, low skull; broad, flat palate; wide, flat dentary bone with an elongated symphysis; and low tomial ridge on the beak. The widened palate and dentaries give ''Eochelone'' wide, flat jaws suitable for crushing hard-shelled organisms. Classification Species * †''E. acutirostris'' * †''E. platyops' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacifichelys
''Pacifichelys'' is an extinct genus of sea turtle from the Middle Miocene of Peru ( Pisco Formation) and California (Temblor Formation).''Pacifichelys'' at .org It was first named by and Nicholas D. Pyenson in 2010, and the type species is ''Pacifichelys urbinai'' from Peru. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mexichelys
''Mexichelys'' is an extinct monotypic genus of sea turtle which lived in Mexico during the Cretaceous. The only species is ''Mexichelys coahuilaensis''. ''Mexichelys'' was erected in 2010 as a replacement name for '' Euclastes coahuilaensis'', a species named in 2009. Cladogram based on Lynch and Parham (2003) and Parham and Pyenson (2010): References External links ''Mexichelys''in the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Paleo ... {{Cheloniidae Late Cretaceous turtles of North America Cheloniidae Fossil taxa described in 2010 Fossils of Mexico Prehistoric turtle genera Extinct turtles Monotypic prehistoric reptile genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mexichelys Coahuilaensis
''Mexichelys'' is an extinct monotypic genus of sea turtle which lived in Mexico during the Cretaceous. The only species is ''Mexichelys coahuilaensis''. ''Mexichelys'' was erected in 2010 as a replacement name for ''Euclastes ''Euclastes'' is an extinct genus of sea turtles that survived the Cretaceous–Paleogene mass extinction. The genus was first named by Edward Drinker Cope in 1867, and contains three species. ''E. hutchisoni'', was named in 2003 but has since b ... coahuilaensis'', a species named in 2009. Cladogram based on Lynch and Parham (2003) and Parham and Pyenson (2010): References External links ''Mexichelys''in the Paleobiology Database {{Cheloniidae Late Cretaceous turtles of North America Cheloniidae Fossil taxa described in 2010 Fossils of Mexico Prehistoric turtle genera Extinct turtles Monotypic prehistoric reptile genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheloniidae
Cheloniidae is a family of typically large marine turtles that are characterised by their common traits such as, having a flat streamlined wide and rounded shell and almost paddle-like flippers for their forelimbs. They are the only sea turtles to have stronger front limbs than back limbs. The six species that make up this family are: the green sea turtle, loggerhead sea turtle, olive ridley sea turtle, hawksbill sea turtle, flatback sea turtle and the Kemp's ridley sea turtle. Morphology In contrast to their earth-bound relatives, tortoises, sea turtles do not have the ability to retract their heads into their shells. Their plastron, which is the bony plate making up the underside of a turtle or tortoise's shell, is comparably more reduced from other turtle species and is connected to the top part of the shell by ligaments without a hinge separating the pectoral and abdominal plates of the plastron. Sizes among the seven species of sea turtles range from 71 to 213 cm; for ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glossochelys
''Glossochelys'' is an extinct genus of sea turtles from the Pancheloniidae that has been discovered in Eocene (Ypresian) deposits in Harwich, England (London Clay Formation) that was first described as a species of ''Lytoloma'' in 1842. The type species, ''G. planimentum'', was described as a separate species in 1871 by Harry Seeley. It was possibly the same animal as ''Euclastes'' or ''Erquelinnesia''.E. D. Cope. 1870. Synopsis of the Extinct Batrachia, Reptilia and Aves of North America. Part II. ''Transactions of the American Philosophical Society, New Series'' 14:105-235 References Chelonioidea Prehistoric turtle genera Ypresian genus first appearances Eocene genus extinctions Eocene turtles Eocene reptiles of Europe Fossils of England Fossil taxa described in 1871 {{Turtle-stub ... [...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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladogram
A cladogram (from Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an evolutionary tree because it does not show how ancestors are related to descendants, nor does it show how much they have changed, so many differing evolutionary trees can be consistent with the same cladogram. A cladogram uses lines that branch off in different directions ending at a clade, a group of organisms with a last common ancestor. There are many shapes of cladograms but they all have lines that branch off from other lines. The lines can be traced back to where they branch off. These branching off points represent a hypothetical ancestor (not an actual entity) which can be inferred to exhibit the traits shared among the terminal taxa above it. This hypothetical ancestor might then provide clues about the order of evolution of various features, adaptation, and other evolutionary narratives about an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argillochelys
''Argillochelys'' is an extinct genus of sea turtle from the middle to lower Eocene in what is now Britain. It was first named by Lydekker in 1889. A species, ''A. africana'', was found in Morocco, and described in 2008 by Tong & Hirayama. References External links ''Argillochelys''at the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Paleo ... www.ppne.co.uk Eocene turtles Chelonioidea Eocene reptiles of Europe Eocene reptiles of Africa Prehistoric turtle genera Taxa named by Richard Lydekker Fossil taxa described in 1889 {{paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Symphysis
A symphysis (, pl. symphyses) is a fibrocartilaginous fusion between two bones. It is a type of cartilaginous joint, specifically a secondary cartilaginous joint. # A symphysis is an amphiarthrosis, a slightly movable joint. # A growing together of parts or structures. Unlike synchondroses, symphyses are permanent. Examples The more prominent symphyses are: * the pubic symphysis * sacrococcygeal symphysis * intervertebral disc between two vertebrae * in the sternum, between the manubrium and body * mandibular symphysis In human anatomy, the facial skeleton of the skull The skull is a bone protective cavity for the brain. The skull is composed of four types of bone i.e., cranial bones, facial bones, ear ossicles and hyoid bone. However two parts are more p ..., in the jaw Symphysis disorders Pubic symphysis diastasis Pubic symphysis diastasis, is an extremely rare complication that occurs in women who are giving birth. Separation of the two pubic bones during deliv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
