Short note on progress today,
adding missing scores, repairing wrong scores, ignoring scores I can’t see. This is a good exercise in basic research, checking facts, learning new traits, becoming re-familiarized with taxa I have not looked at in years.
Over the past few days
here, here and here, we’ve been dissecting, reducing and re-scoring the cladogram from Nesbitt et al. 2017, which disagreed in many respects from the large reptile tree (LRT, 1560 taxa) and used a completely different set of some 400 characters to do so.
Here (Fig. 1)
the dino mimics among the poposaurs, Silesaurus and Sacisaurus, are now nesting with other poposaurs, as in the LRT, still closer to dinos than the crocs are, distant from results recovered in the LRT.
The basal phytodinosaur,
Eoraptor, now nests closer to the other phytodinosaurs, but not within Herrarasaurus, as in the LRT.
More work needs to be done
with rauisuchians and crocs before I add relevant taxa (as determined by the LRT) until the pertinent scores are all repaired.
Nesbitt SJ 2011. The early evolution of archosaurs: relationships and the origin of major clades. Bulletin of the American Museum of Natural History 352: 292 pp.
Nesbitt S et al. 2017. The anatomy of Teleocrater Rhadinus, an early avemetatarsalian from the lower portion of the Lifua Member of the Manda Beds (Middle Triassic). Journal of Vertebrate Paleontology 142-177. https://doi.org/10.1080/02724634.2017.1396539