ornithischia वाक्य
उदाहरण वाक्य
मोबाइल
- Such a pelvic arrangement is typical for the Ornithischia, to which group part of the fossils of " Chilesaurus " were at first incorrectly referred.
- Furthermore, the bird-hipped dinosaurs, Ornithischia, have all been designated dinosaurs with a more recent common ancestor to " Triceratops " than modern birds.
- Dinosaurs can be defined as the last common ancestor of birds ( Saurischia ) and " Triceratops " ( Ornithischia ) and all the descendants of that ancestor.
- Although " Lesothosaurus " comes from 195-206 Ma, skeletal features suggest that it branched from the main Ornithischia line at least as early as " Pisanosaurus ".
- For example, the earliest branching point in dinosaur evolution was between the Ornithischia, whose defining characteristics include a backward-rotated pelvis, and Saurischia, whose defining characteristics include an asymmetrical hand.
- Molnar in 1980 acknowledged that these were ossified tendons, but denied that they were homologous to the ossified tendons of other Ornithischia and claimed that they resembled the pathological tendon aponeurosis of modern crocodiles.
- The first exact clade definition of Stegosauria was given by Peter Malcolm Galton in 1997 : all thyreophoran Ornithischia more closely related to " Stegosaurus " than to " Ankylosaurus ".
- "Pisanosaurus " is very basal within Ornithischia; the postcrania seem to lack any good ornithischian synapomorphy and it was even suggested by Paul Sereno in 1991 that the fossil is a chimera.
- In 1870, Huxley expanded this into a full article, in which he became the first researcher to notice that the Ornithischia ( not yet known as such at the time ) had a pubic bone pointing backwards like birds.
- Though at first it was considered by Thulborn a member of the Fabrosauridae and by Peter Galton a hypsilophodontid, Paul Sereno ( 1991 ) classified " A . kuehnei " as Ornithischia " incertae sedis ".
- Ornithischia includes a variety of species which were primarily herbivores . ( "'NB : "'the terms " lizard hip " and " bird hip " are misnomers birds evolved from dinosaurs with " lizard hips " .)
- Another difference is in the skull, the upper skull of the Ornithischia is more solid and the joint connecting the lower jaw is more flexible; both are adaptations to herbivory and both can already be seen in " Lesothosaurus ".
- Similar things happened between birds and ornithischia; the hip structure in birds evolved independently, but along similar patterns, as did that of the ornithischians .-- " 32 " 13 : 31, 12 January 2017 ( UTC)
- Godefroit " et al . " concluded that the filaments earlier reported in Ornithischia, with " Psittacosaurus " and " Tianyulong ", could be archosauromorphs, as some distinctive archosaurian integument features have appeared this far back.
- Various possible evolutionary trees place it as the sister taxon of Dinosauria, the most basal member of Ornithischia ( the group that includes most herbivorous Mesozoic dinosaurs ), or a member of Theropoda ( the group that includes most carnivorous dinosaurs as well as birds ).
- However, Harry Seeley disagreed with this interpretation, and split the Dinosauria into two orders, the Saurischia ( " lizard-hipped " ) and the Ornithischia ( " bird-hipped " ), which were seen as members of the Archosauria with no special relationship to each other.
- The term " dinosaur " is restricted to just those reptiles descended from the last common ancestor of the groups Saurischia and Ornithischia ( clade Dinosauria, which includes birds ), and current scientific consensus is that this group excludes the pterosaurs, as well as the various groups of extinct marine reptiles, such as ichthyosaurs, plesiosaurs, and mosasaurs.
- "' Dinosaur classification "'began in 1842 when Sir Richard Owen placed " Iguanodon ", " Megalosaurus ", and " Hylaeosaurus " in " a distinct tribe or suborder of Saurian Reptiles, for which I would propose the name of Dinosauria . " In 1887 and 1888 Harry Seeley divided dinosaurs into the two orders Saurischia and Ornithischia, based on their hip structure.
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