Anatomy, Phylogeny and Palaeobiology of Early Archosaurs and

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Such modifications, originating in the last common ancestor of a certain taxonomic group, are called the synapomorphies of such a group. [26] A detailed assessment of archosaur interrelations by Sterling Nesbitt [27] confirmed or found the following twelve unambiguous synapomorphies, some previously known: epipophyses, obliquely backward pointing processes on the rear top corners, present in the anterior (front) neck vertebrae behind the atlas and axis, the first two neck vertebrae radius, a lower arm bone, shorter than 80% of humerus length on the astragalus and calcaneum, upper ankle bones, the proximal articular facet, the top connecting surface, for the fibula occupies less than 30% of the transverse width of the element exoccipitals (bones at the back of the skull) do not meet along the midline on the floor of the endocranial cavity, the inner space of the braincase concave articular surface for the fibula of the calcaneum (the top surface of the calcaneum, where it touches the fibula, has a hollow profile) Nesbitt found a number of further potential synapomorphies, and discounted a number of synapomorphies previously suggested.

Pages: 624

Publisher: Geological Society of London (September 30, 2013)

ISBN: 1862393613

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