hesperornis वाक्य
उदाहरण वाक्य
मोबाइल
- The first species recognized from outside the Niobrara chalk, " Hesperornis altus ", lived about 78 million years ago in Montana, and is known from a partial lower leg from the base of the freshwater Judith River Formation ( or, possibly, the top of the underlying, marine Claggett Shale formation ).
- The metotic strut of " C . saharicus " is smaller and located more closely to the midline of the animal's body than in non-avian maniraptors like " Dromaeosaurus " and " Troodon ", as well as primitive birds like " Archaeopteryx " and " Hesperornis ".
- ""'Hesperornis " "'( meaning " western bird " ) is a genus of flightless aquatic birds that spanned the first half of the Campanian age of the Late Cretaceous period ( 83.5 78 O . C . Marsh in the late 19th century Bone Wars, it was an early find in the history of avian paleontology.
- The best known of the " Odontornithes " are " Hesperornis regalis ", standing about 3 ft . high, the somewhat taller " H . crassipes ", and " Ichthyornis dispar " . " Hesperornis " looked somewhat similar to a loon, while " Ichthyornis " was quite similar to a gull or petrel.
- The best known of the " Odontornithes " are " Hesperornis regalis ", standing about 3 ft . high, the somewhat taller " H . crassipes ", and " Ichthyornis dispar " . " Hesperornis " looked somewhat similar to a loon, while " Ichthyornis " was quite similar to a gull or petrel.
- Darwin himself told Marsh in an 1880 letter that " Ichthyornis " and " Hesperornis " offered " the best support for the theory of evolution " since he had first published " On the Origin of Species " in 1859 . Others at the time also recognized the implications of a nearly modern bird with reptilian teeth, and feared the controversy it caused.
- The first species to be described, the type species, is " Hesperornis regalis " . " H . regalis " is also the best known species, and dozens of specimens ( from fragments to more complete skeletons ) have been recovered, all from the Smoky Hill Chalk Member of the Niobrara Formation ( dating to the early Campanian age, between 83.5 80.5 million years ago ).
- "Hesperornis crassipes " was named in 1876 by Marsh, who initially classified it in a different genus as " Lestornis crassipes " . " H . crassipes " was larger than " H . regalis ", had five ribs as opposed to four in the first species, and differed in aspects of the bone sculpturing on the breastbone and lower leg . " H . crassipes " is known from the same time and place as " H . regalis ".
- The Western Interior Seaway was home to early birds also, including the flightless " Hesperornis " which had stout legs for swimming through water and small wing-like appendages used for marine steering rather than flight; and the tern-like " Ichthyornis ", an early avian with a toothy beak . " Icthyornis " shared the sky with large pterosaurs such as " Nyctosaurus " and " Pteranodon " . " Pteranodon " fossils are very common and it was probably a major component of the surface ecosystem, though it was found in only the southern reaches of the Seaway.
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