Novel insights – part 3

Earlier here and here we looked at some of the novel insights recovered by the large reptile tree at Today we’ll look at the pterosaurs.

New Lepidosauromorpha part 3

  1. Pterosaurs arise from fenestrasaurs like Cosesaurus, Sharovipteryx and Longsiquama.
  2. The basalmost pterosaurs is the long-legged Bergamodactylus (MPUM 6009),
  3. After basal Triassic taxa, pterosaurs split into dimorophodontids (including anurognathids) and eudimorphodontids (all other pterosaurs).
  4. The IVPP V13758 embryo would grow to become an 8x larger, anurognathid, which is very big considering the embryo is the size of several other anurognathids.
  5. The flathead anurognathid is not congeneric with Anurognathus.
  6. The holotype of Jeholopterus is probably a blood-lapping vampire.
  7. Eudimorphodon has an unusual posteriorly wide torso.
  8. The holotype of Sordes includes a displaced ulna and radius, which is the cause of the wing membrane appearance between the ankles. Other Sordes specimens are not conspecific nor congeneric.
  9. Rhamphorhynchus was derived from Campylognathoides after phylogenetic miniaturization.
  10. A juvenile Rhamphorhynchus longiceps was recovered by phylogenetic analysis. It was otherwise considered an adult.
  11. Embryo, juvenile and adult pterosaurs cannot be distinguished except by the presence of eggshell, associated adults of similar morphology and phylogenetic analysis.
  12. Pterodactyloid-grade pterosaurs arose 4x by convergence, twice through Dorygnathus and twice through Scaphognathus and all by way of phylogenetic miniaturization.
  13.  JME-Sos 2428 (no. 57 in the Wellnhofer 1970 catalog) is a flightless pterosaur.
  14. Zhejiangopterus demonstrates isometry during ontogeny.
  15. When pterosaurs walked they could not and did not put much weight on their ski-pole-like fingers. When they floated they locomoted principally with their forelimbs.
  16. Darwinopterus was not the transitional pterosaur, but a dead end.
  17. The smallest known adult pterosaur, B St 1967 I 276 (No. 6 of Wellnhofer 1970) is the size of an adult bee hummingbird.
  18. Germanodactylids gave rise to pteranododontids, dsungaripterids, shenzhoupterids and tapejarids. All have a sharp, tooth-tipped rostrum.
  19. The variety in Pteranodon and Nyctosaurus skulls is phylogenetic, not ontogenetic or gender-based.
  20. Sinopterus liui is not congeneric with the holotype of Sinopterus.
  21. … and many, many more pterosaur insights.

More later.


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