He continued to use Ganocephala and Labyrinthodonta ( which he alternatively referred to as Rhachitomi ) to distinguish animals based on the absence or presence of occipital condyles.
22.
In the skulls of both species of " Rhabdognathus ", the posterior margin is inclined so that both the occipital condyle and the basioccipital tubera below it are visible in occipital view.
23.
Mammals also have a double occipital condyle; they have two knobs at the base of the skull that fit into the topmost neck vertebra, while other tetrapods have a single occipital condyle.
24.
Mammals also have a double occipital condyle; they have two knobs at the base of the skull that fit into the topmost neck vertebra, while other tetrapods have a single occipital condyle.
25.
G�nther and Newton noted that the skull of the Rodrigues starling was shaped somewhat differently and longer than that of the hoopoe starling, being about long from the occipital condyle; it was also narrower, being wide.
26.
In both species of " Rhabdognathus ", the space between the occipital condyle and the basioccipital tubera ( both located in the back of the skull where the vertebrae articulate ) is anteroposteriorly longer than in " D . phosphaticus ".
27.
The jaw mechanics of the plagiosaurid " Gerrothorax " is well known, and is one of the most highly adapted . " Gerrothorax " is thought to have lifted its skull to around 50?above horizontal through the flexing of the atlanto-occipital joint between the occipital condyles of the skull and the suction feed by rapidly opening its mouth.
28.
While the Dollo specimens do not possess frontal bones that are pointed at the rostral end, a trait in 2011 to establish " A . hooleyi " as a distinct species, and also differs in the relative proportions of the occipital condyle and foramen magnum, the authors considered these traits invalid diagnostic characteristics, as they could be a consequence of age differences or preservational artifacts.
