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Ptychotrygonidae
Ptychotrygonidae is an extinct family of cartilaginous fish from the Cretaceous period belonging to the suborder Sclerorhynchoidei. This family contains the genera '' Archingeayia'', ''Asflapristis'', ''Ptychotrygon ''Ptychotrygon'' is a genus of sawfish-like ray whose fossils have been found worldwide from the Cretaceous period (Albian-Maastrichtian). Along with '' Ptychotrygonoides'', '' Texatrygon'', and ''Asflapristis'', it is the member of the family ...'', '' Ptychotrygonoides'', and '' Texatrygon''. References Prehistoric cartilaginous fish families Sclerorhynchoidei {{paleo-rajiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sclerorhynchoidei
Sclerorhynchoidei is an extinct suborder of Rajiformes, rajiform Batoidea, rays that had long Rostrum (anatomy)#Vertebrates, rostra with large Fish scale#Placoid scales, denticles similar to Sawfish, sawfishes and Sawshark, sawsharks. This feature was convergent evolution, convergently evolved, recently proposed as 'pristification', and their closest living relatives are actually Skate (fish), skates. While they are often called "sawfishes", sawskates is a more accurate common name proposed in 2021 for sclerorhynchoids, which has been subsequently used by other researchers. The suborder contains five named families: Ganopristidae, Ischyrhiza, Ischyrhizidae, Onchopristis, Onchopristidae, Ptychotrygonidae, and Schizorhizidae. Several genera (see below) are not currently placed in any of these families. Sclerorhynchoids first appeared in the Barremian and went extinct during the Cretaceous–Paleogene extinction event, with former Paleocene occurrences being misidentifications or Fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asflapristis
''Asflapristis'' is an extinct genus of ptychotrygonid sclerorhynchoid that lived during the Late Cretaceous. It contains two valid species: ''A. cristadentis'' from the Akrabou Formation of Morocco and ''A. rugosa'' from the Eutaw Formation of Georgia and Mississippi and the Pleasant Creek Formation of North Carolina. Articulated skeletons of ''A. cristadentis'' show it had secondarily lost the rostral Rostral may refer to: Anatomy * Rostral (anatomical term), situated toward the oral or nasal region * Rostral bone, in ceratopsian dinosaurs * Rostral organ, of certain fish * Rostral scale The rostral scale, or rostral, in snakes and other sca ... denticles typical of sclerorhynchoids, a process called "depristification". References {{Taxonbar, from=Q131316176 Sclerorhynchoidei Prehistoric cartilaginous fish genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptychotrygon
''Ptychotrygon'' is a genus of sawfish-like ray whose fossils have been found worldwide from the Cretaceous period (Albian-Maastrichtian). Along with '' Ptychotrygonoides'', '' Texatrygon'', and ''Asflapristis'', it is the member of the family Ptychotrygonidae within the suborder Sclerorhynchoidei Sclerorhynchoidei is an extinct suborder of Rajiformes, rajiform Batoidea, rays that had long Rostrum (anatomy)#Vertebrates, rostra with large Fish scale#Placoid scales, denticles similar to Sawfish, sawfishes and Sawshark, sawsharks. This featu .... Species The following species are considered valid: * †''Ptychotrygon ameghinorum'' * †''Ptychotrygon blainensis'' * †''Ptychotrygon eutawensis'' * †''Ptychotrygon geyeri'' * †''Ptychotrygon mcnultyi'' * †''Ptychotrygon nazeensis'' * †''Ptychotrygon pustulata'' * †''Ptychotrygon rostrispatula'' * †''Ptychotrygon striata'' * †''Ptychotrygon triangularis'' * †''Ptychotrygon vermiculata'' References Prehisto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archingeayia
''Archingeayia'' is an extinct genus of sawskate from the Cretaceous period. The name is derived from the type locale of the type species: Archingeay−Les Nouillers, France. This genus is known currently by isolated oral teeth alone from a singular species, ''Archingeayia sistaci''. The specific epithet honors geologist Paul Sistac. This species was described from the lower Cenomanian of France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ....Wueringer, B. E., Squire, L., & Collin, S. P. (2009). The biology of extinct and extant sawfish (Batoidea: Sclerorhynchidae and Pristidae). ''Reviews in Fish Biology and Fisheries'', ''19''(4), 445. References Sclerorhynchoidei Monotypic prehistoric cartilaginous fish genera {{Paleo-shark-stub ... [...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] |
Cartilaginous Fish
Chondrichthyes (; ) is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fish'', which have skeletons primarily composed of bone tissue. Chondrichthyes are aquatic vertebrates with paired fins, paired nares, placoid scales, conus arteriosus in the heart, and a lack of opercula and swim bladders. Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates. The class is divided into two subclasses: Elasmobranchii (sharks, rays, skates and sawfish) and Holocephali ( chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class). Extant chondrichthyans range in size from the finless sleeper ray to the over whale shark. Anatomy Skeleton The skeleton is cartilaginous. The notochord is gradually replaced by a vertebral column during development, e ... [...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] |
Prehistoric Cartilaginous Fish Families
Prehistory, also called pre-literary history, is the period of human history between the first known use of stone tools by hominins million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared years ago. It took thousands of years for writing systems to be widely adopted, with writing having spread to almost all cultures by the 19th century. The end of prehistory therefore came at different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. It is based on an old conception of history that without written records there could be no history. The most common conception today is that history is based on evidence, however the concept of prehistory hasn't been completely discarded. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
