ignored in the scientific literature in favor of the order-level name Hesperornithiformes, coined one year later. In 2004, Clarke became the first to define...

latter included the superficially gull-like Ichthyornis and the Hesperornithiformes, which became so well adapted to hunting fish in marine environments...

represented by a single species; the leatherback sea turtle. The Hesperornithiformes were flightless, marine diving birds that swam like grebes. Baculites...

loons. More recent work looking at the morphometrics of the feet in hesperornithiformes and modern sea birds has thrown this interpretation into question...

hdl:1807/77762. Tim T. Tokaryk; C. R. Harington (1992). "Baptornis sp. (Aves: Hesperornithiformes) from the Judith River Formation (Campanian) of Saskatchewan, Canada"...

tibiotarsi, and they seem certainly more similar to the bones of Hesperornithiformes and (due to the smallish size) to Parahesperornis specifically. However...

known to occur in the Cretaceous period, the earliest being the Hesperornithiformes, like Hesperornis regalis, a flightless loon-like seabird that could...

or ducks, like Gansus. Some evolved as swimming hunters, like the Hesperornithiformes – a group of flightless divers resembling grebes and loons. While...

A Classification Uncertain Ricardoestesia gilmorei Birds such as Hesperornithiformes were present, as well as giant Pterosauria related to Quetzalcoatlus...

between loons and the entirely unrelated extinct Cretaceous order Hesperornithiformes. In particular Enaliornis, which was apparently an ancestral and...