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Chelydrid
The Chelydridae is a family of turtles that has seven extinct and two extant genera. The extant genera are the snapping turtles, ''Chelydra'' and ''Macrochelys''. Both are endemic to the Western Hemisphere. The extinct genera are '' Acherontemys'', ''Chelydrops'', ''Chelydropsis'', ''Emarginachelys'', ''Macrocephalochelys'', '' Planiplastron'', and ''Protochelydra''. Fossil history The Chelydridae have a long fossil history, with extinct species reported from North America as well as all over Asia and Europe, far outside their present range. The earliest described chelydrid is ''Emarginachelys cretacea'', known from well-preserved fossils from the Maastrichtian stage of the Late Cretaceous of Montana. Another well-preserved fossil chelydrid is the Late Paleocene ''Protochelydra zangerli'' from North Dakota. The carapace of ''P. zangerli'' is higher-domed than that of the recent ''Chelydra'', a trait conjectured to be associated with the coexistence of large, turtle-eating crocod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emarginachelys
''Emarginachelys cretacea'' is a turtle belonging to the group Cryptodira, known from well preserved fossils from the Maastrichtian stage of the Late Cretaceous of Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an .... Its exact phylogenetic position within Cryptodira is uncertain; different authors considered it to be either the earliest described chelydrid or a fossil relative of kinosternoids. References Cryptodira Prehistoric turtle genera Late Cretaceous turtles of North America Hell Creek fauna Fossil taxa described in 1978 {{paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macrocephalochelys
''Macrocephalochelys'' is an extinct genus of turtles in the family Chelydridae. It was first described from a partial skull from the Pliocene found in Ukraine by Piboplichko and Taraschchuk in 1960. It was assigned to the family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ... Chelydridae by R. L. Carroll in 1988 although it had been hypothesised to belong in Chelydridae by Chkhikvadze in 1971. References Chelydridae Pliocene turtles Pliocene reptiles of Europe Prehistoric turtle genera Fossil taxa described in 1960 Extinct turtles {{paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emarginachelys Cretacea
''Emarginachelys cretacea'' is a turtle belonging to the group Cryptodira, known from well preserved fossils from the Maastrichtian stage of the Late Cretaceous of Montana. Its exact phylogenetic position within Cryptodira is uncertain; different authors considered it to be either the earliest described chelydridae, chelydrid or a fossil relative of Kinosternoidea, kinosternoids. References Cryptodira Prehistoric turtle genera Late Cretaceous turtles of North America Hell Creek fauna Fossil taxa described in 1978 {{paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protochelydra Zangerli
''Protochelydra zangerli'' is an extinct species of chelydid in the extinct genus ''Protochelydra'' of Chelydridae The Chelydridae is a family of turtles that has seven extinct and two extant genera. The extant genera are the snapping turtles, ''Chelydra'' and '' Macrochelys''. Both are endemic to the Western Hemisphere. The extinct genera are '' Acherontemys .... References Chelydridae Extinct reptiles Paleogene reptiles of North America Eocene turtles Prehistoric turtle genera Fossil taxa described in 1973 Extinct turtles {{paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protochelydra
''Protochelydra zangerli'' is an extinct species of chelydid in the extinct genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ... ''Protochelydra'' of Chelydridae. References Chelydridae Extinct reptiles Paleogene reptiles of North America Eocene turtles Prehistoric turtle genera Fossil taxa described in 1973 Extinct turtles {{paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chelydropsis
''Chelydropsis'' is an extinct genus in the family of Chelydridae, snapping turtle that lived from the Oligocene to the Pliocene in Asia and Europe. Species * ''Chelydropsis aubasi'' * ''Chelydropsis apellanizi'' * ''Chelydropsis decheni'' * ''Chelydropsis kusnetzovi'' * ''Chelydropsis manuascensis'' * ''Chelydropsis murchisoni'' * ''Chelydropsis sansaniensis'' References * Romer, Alfred Sherwood (Jan. 1 1997). ''The Osteology of the Reptiles.'' Reprint edition. Krieger Pub. Co. pp. 800. {{Chelydridae Chelydridae Oligocene turtles Miocene turtles Pliocene turtles Oligocene reptiles of Asia Oligocene reptiles of Europe Miocene reptiles of Asia Miocene reptiles of Europe Pliocene reptiles of Asia Pliocene reptiles of Europe Prehistoric turtles of Asia Prehistoric turtle genera Taxa named by Wilhelm Peters Fossil taxa described in 1868 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chelydropsis Murchisoni 01
''Chelydropsis'' is an extinct genus in the family of snapping turtle that lived from the Oligocene to the Pliocene in Asia and Europe. Species * ''Chelydropsis aubasi'' * ''Chelydropsis apellanizi'' * ''Chelydropsis decheni'' * ''Chelydropsis kusnetzovi'' * ''Chelydropsis manuascensis'' * ''Chelydropsis murchisoni'' * ''Chelydropsis sansaniensis ''Chelydropsis'' is an extinct genus in the family of Chelydridae, snapping turtle that lived from the Oligocene to the Pliocene in Asia and Europe. Species * ''Chelydropsis aubasi'' * ''Chelydropsis apellanizi'' * ''Chelydropsis decheni'' * ''C ...'' References * Romer, Alfred Sherwood (Jan. 1 1997). ''The Osteology of the Reptiles.'' Reprint edition. Krieger Pub. Co. pp. 800. {{Chelydridae Chelydridae Oligocene turtles Miocene turtles Pliocene turtles Oligocene reptiles of Asia Oligocene reptiles of Europe Miocene reptiles of Asia Miocene reptiles of Europe Pliocene reptiles of Asia Pliocene reptiles of Europe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinction
Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and recover. As a species' potential Range (biology), range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxon, Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the Fossil, fossil record) after a period of apparent absence. Over five billion species are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryotes globally, possibly many times more if microorganisms are included. Notable extinct animal species include Dinosaur, non-avian dinosaurs, Machairodontinae, saber-toothed cats, and mammoths. Through evolution, species arise through the process of specia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maastrichtian
The Maastrichtian ( ) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (geology), age (uppermost stage (stratigraphy), stage) of the Late Cretaceous epoch (geology), Epoch or Upper Cretaceous series (stratigraphy), Series, the Cretaceous geologic period, Period or system (stratigraphy), System, and of the Mesozoic geologic era, 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). It is named after the city of Maastricht, the capital and largest city of the Limburg (Netherlands), Limburg province in the Netherlands. The Cretaceous–Paleogene extinction event (formerly known as the Cretaceous–Tertiary period, Tertiary extinction event) occurred at the end of this age. In this extinction event, mass extinction, many commonly recognized groups such as non-avian dinosaurs, plesiosaurs and mosasaurs, as well as many other lesser-kn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 ninth and longest geological period of the entire Phanerozoic. The name is derived from the Latin , 'chalk', which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation . The Cretaceous was a period with a relatively warm climate, resulting in high Sea level#Local and eustatic, eustatic sea levels that created numerous shallow Inland sea (geology), inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was largely ice-free, although there is some evidence of brief periods of glaciation during the cooler first half, and forests extended to the poles. Many of the dominant taxonomic gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the more recent 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, Aus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Montana
Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, and the Provinces and territories of Canada, Canadian provinces of Alberta, British Columbia, and Saskatchewan to the north. It is the List of U.S. states and territories by area, fourth-largest state by area, but the List of U.S. states and territories by population, eighth-least populous state and the List of U.S. states and territories by population density, third-least densely populated state. Its List of capitals in the United States, capital is Helena, Montana, Helena, while the List of municipalities in Montana, most populous city is Billings, Montana, Billings. The western half of the state contains numerous mountain ranges, while the eastern half is characterized by western prairie terrain and badlands, with smaller mountain ranges f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
