hesperornis वाक्य
उदाहरण वाक्य
मोबाइल
- Marsh explicitly named his second species of " Hesperornis " in 1876 for an incomplete metatarsus recovered from the same layers of the Niobrara chalk as " H . regalis ".
- Traditionally, " Hesperornis " is depicted with a mode of locomotion similar to modern loons or grebes, and study of their limb proportions and hip structure has borne out this comparison.
- He eventually received parts of 50 specimens of " Hesperornis ", which allowed him to make a much stronger demonstration of an evolutionary link between reptiles and birds than had been possible before.
- In addition to non-crown group primitive birds like " Archaeopteryx ", " Hesperornis " and " Confuciusornis ", stem group birds include the dinosaurs and the pterosaurs.
- At about long, " H . rossicus " was the largest species of " Hesperornis " and among the largest hesperornithines, slightly smaller than the large Canadian genus " Canadaga ".
- Stomach contents from a tylosaur recovered in South Dakota included remains of another mosasaur, a bony fish, the large, flightless seabird " Hesperornis ", and possibly a shark, indicating that tylosaurs were generalists.
- Its exact relationships are not completely resolved, but it probably belongs into the Hesperornithidae just like " Hesperornis ", well-known from the Western Interior Seaway that covered most of the US Midwest in the Mesozoic.
- The latter part of this section deals with analyzing the skeletal anatomy of the fossil birds " Hesperornis " and " Ichthyornis ", but Heilmann ultimately decides that they are of no importance to his investigations.
- As opposed to " Hesperornis " which almost certainly had to slide on its belly or galumph like an earless seal, " Baptornis "'s lower leg was not as firmly placed along the body sides.
- While initially placed in the new genus " Coniornis " by Marsh, this was due mostly to his belief that " Hesperornis " existed only in Kansas, so any species from Montana should be placed in a different genus.
- These similarities, however, as the more recently determined fact that the osteons of their bones at least in " Hesperornis " were arranged in a pattern similar to that in Neognathae, are today considered to be due to convergent evolution.
- In 1993, the first " Hesperornis " remains from outside of North America were recognized as a new species by Nessov and Yarkov . They named " Hesperornis rossicus " for a fragmentary skeleton from the early Campanian of Russia near Volgograd.
- In 1993, the first " Hesperornis " remains from outside of North America were recognized as a new species by Nessov and Yarkov . They named " Hesperornis rossicus " for a fragmentary skeleton from the early Campanian of Russia near Volgograd.
- "Hesperornis " was primarily marine, and lived in the waters of such contemporary shallow shelf seas as the Western Interior Seaway, the Turgai Strait, and the North Sea, which then were subtropical to tropical waters, much warmer than today.
- Two " Hesperornis " investigate, but Helen Cutter shoos them off by throwing small stones, and says that they " " tend to be more dumb than violent, only attacking when they're in a panic or disturbed . ""
- However, some of the youngest known specimens of " Hesperornis " have been found in inland freshwater deposits of the Foremost Formation, suggesting that some species of " Hesperornis " may have eventually moved, at least partially, away from a primarily marine habitat.
- However, some of the youngest known specimens of " Hesperornis " have been found in inland freshwater deposits of the Foremost Formation, suggesting that some species of " Hesperornis " may have eventually moved, at least partially, away from a primarily marine habitat.
- Like modern birds, " Confuciusornis " had a toothless beak, but close relatives of modern birds such as " Hesperornis " and " Ichthyornis " were toothed, indicating that the loss of teeth occurred convergently in " Confuciusornis " and living birds.
- In terms of limb length, shape of the hip bones, and position of the hip socket, " Hesperornis " is particularly similar to the common loon ( " Gavia immer " ), probably exhibiting a very similar manner of locomotion on land and in water.
- You " et al . " ( 2006 ) concluded that the anatomical characteristics of " Gansus " were similar to foot-propelled diving birds, such as " Hesperornis " ( from the Cretaceous ) and the loons ( Gaviidae ) and grebes ( Podicipedidae ).
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