no longer gets stuck in corners of underwater bases.
There are also some extremely rare bird fossils including a skeleton of an ichthyornis
and one with its feathers still on.
Carinatae is used for the clade including the most recent ancestor of Ichthyornis and modern birds plus all of its descendants.
Ichthyornis, Ambiortus, and Neornithes) (ZHOU & ZHANG, 2001; HOPE, 2002; CLARKE & NORELL, 2002; CLARKE, 2004; CLARKE et al.
Ichthyornis, Yanornis, Apsaravis; CLARKE & NORELL, 2002; CLARKE, 2004; CLARKE et al.
Eighty million years ago, Ichthyornis
lacks the toothless bill on the lower jaw and part of the upper, although there is one on the front of the upper jaw.
The next chapter (The Cretaceous-Divers and Seabirds) covers not only the extinct diver Hesperornis and seabird Ichthyornis
and closest of kin from the Cretaceous, but also includes a curious pastiche of topics from enantiornithine land birds to DNA-DNA hybridization.
The Texas specimens can be correlated with greater precision than most material of Ichthyornis and span a period essentially equal to that during which the Niobrara Formation, source of the classic specimens, was deposited.
Since it was first described, the avian genus Ichthyornis has been among the taxa most associated with the classic chalk strata of North America.
Ichthyornis was reported from the Cretaceous of Texas by Marsh (1877).
New Dino: Ichthyornis
- A fish-eating seagull that likes to ride on its owner's shoulder.
The sequence of these modifications has remained elusive because Late Cretaceous bird fossils, such as Hesperornis and Ichthyornis
, already possess a reduced tail (Marsh 1880).