Monday, December 21, 2015

Pterosaur and Basal Euparaves

Pterorhynchus (Rhamphorhynchidae)

Scansoriopteryx (Scansoriopterygidae)

Note that in cladistics terms, basal Euparaves did not evolve from Pterorhynchus, but rather they share a common ancestor.
In non-cladistic terms, we could say that basal Euparaves evolved from a creature like Pterorhynchus. We can see that that is credible, from the drawings above.

For reference:,d.dmo (O'Connor and Sullivan2014)

Fig. 7 Tails and pelves of derived maniraptoran theropods (modified from Persons et al., in press)
A. Anchiornis (Deinonychosauria: Troodontidae?); B. Archaeopteryx (Aves); C. Jeholornis (Aves); D. Confuciusornis (Aves); E. Gallus (Aves); F. Caudipteryx (Oviraptorosauria); G. Khaan (Oviraptorosauria); H. Epidendrosaurus (Scansoriopterygidae); I. Zhongornis (incertae sedis); J. Epidexipteryx (Scansoriopterygidae) Color key: blue short proximal caudal vertebrae; green transitional caudals; yellow elongate distal caudals; orange partially or fully fused terminal caudals (pygostyle)

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