The specimens of A. rex are not comparable with the type of Graculavus velox, which was from a larger bird. Anatalavis rex was a larger, heavier bird than Telmatornis priscus, with the humerus remarkably short and robust, so that the overall length of the humerus in A. rex would scarcely have exceeded that of T. priscus. Anatalavis must have been a bird of considerably different flight habits from Telmatornis or Presbyornis. The overall appearance of its humerus is in fact rather duck-like, except for the more expanded distal end. It is still quite short and stout even for a duck.
Genus Laornis Marsh, 1870
Type-Species.—Laornis edvardsianus Marsh, 1870, by monotypy.
Included Species.—Type species only.
Laornis edvardsianus Marsh, 1870
Figure 8a,c,e
Laornis edvardsianus Marsh, 1870:206.
Holotype.—Distal end of right tibiotarsus, YPM 820.
Locality and Horizon.—From pits of the Pemberton Marl Company at Birmingham, Burlington County, New Jersey; collected by J.C. Gaskill; Late Cretaceous (Maastrichtian), basal Hornerstown Formation.
Measurements (in mm).—Distal end of tibiotarsus, YPM 820: distal width across condyles 22.6, depth of external condyle 19.3, depth of internal condyle 21.1, least shaft width 11.7, least shaft depth 9.6.