The ancestry of the little biped, Scleromochlus

Figure 1. The ancestry of Scleromochlus going back to Lewisuchus, Saltoposuchus, Terrestrisuchus, SMNS 12591 and Gracilisuchus.

Figure 1. The ancestry of Scleromochlus going back to Lewisuchus, Saltoposuchus, Terrestrisuchus, SMNS 12591 and Gracilisuchus, which appears to be the chubby, short-legged, secondarily quadrupedal one. 

Once miniaturization and bipedal locomotion appeared in a sister to Lewisuchus (Fig. 1), evolution provided a variety of bipeds in basal archosaurs in a variety of sizes. These (Fig. 1) represent one such clade. Another clade derived from a sister to Lewisuchus produced poposaurs. Yet another produced, Litargosuchus, Dibothrosuchus and extant crocodilians. Still another produced Pseudhesperosuchus and basal dinos.

The large reptile tree is now up to 460+ taxa, still working with the same 228 character list.

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