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Are compsognathids juveniles of larger theropods?

Monday, January 3, 2022 13:41

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Cau 2021 brings us
a new hypothesis of theropod interrelationships, agreeing with others that an Early Cretaceous theropod genus, Scipionyx, was a juvenile. Cau did not match it to 5x larger Middle Jurassic Proceratosaurus (Fig. 1), reported here in 2018, nor did Cau mention Proceratosaurus.

Figure 1. The hatchling Early Cretaceous Scipionyx compared to the adult Middle Jurassic Proceratosaurus. Scipionyx provides clues to the post-crania of Proceratosaurus. Proceratosaurus provides clues to the adult skull shape of Scipionyx.

Cau 2021 takes things one step further
by considering the possibility that more small theropods, like Juravenator and Scuriumimus, were also juveniles of larger genera. In the large reptile tree (LRT, 2029 taxa; subset Fig. 2) 70cm long Juravenator nests with 70cm long Sinosauropteryx. 60cm long Scuriumimus nests with 2m long Ornitholestes.

Comments on this video were generally positive, in agreement with Caui’s hypothesis. Click to play.

References
Cau A 2021. Comments on the Mesozoic theropod dinosaurs from Italy. Atti Soc. Nat. Mat. Modena 152

https://pterosaurheresies.wordpress.com/2018/05/10/what-is-scipionyx/

Source: https://pterosaurheresies.wordpress.com/2022/01/04/are-compsognathids-juveniles-of-larger-theropods/

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