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 ".
22.
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.
23.
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.
24.
In addition to non-crown group primitive birds like " Archaeopteryx ", " Hesperornis " and " Confuciusornis ", stem group birds include the dinosaurs and the pterosaurs.
25.
At about long, " H . rossicus " was the largest species of " Hesperornis " and among the largest hesperornithines, slightly smaller than the large Canadian genus " Canadaga ".
26.
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.
27.
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.
28.
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.
29.
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.
30.
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.
