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Juvenile theropods Megaraptor and "Nanotyrannus" [Tyrannosaurus]



Ben Creisler
bcreisler@gmail.com

Two preprint papers in open access PeerJ:



Chan-gyu Yun (2015)
Comments on the juvenile Megaraptor specimen and systematic positions
of megaraptoran theropods.
PeerJ PrePrints 3:e1051
doi:  http://dx.doi.org/10.7287/peerj.preprints.851v1


In this paper, I comment on Porfiri et al. (2014), "Juvenile specimen
of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid
radiation". Though Porfiri et al. provided numerous coelurosaurian
characters on the Megaraptor specimen, their referral of the taxon to
tyrannosauroidea is based on some problematic characters. Also, the
specimen bears a feature which does not correspond to
tyrannosauroidea. All things considered, the suggested evidences
supporting the position of Megaraptora within tyrannosauroidea are
weak.


***

Chan-gyu Yun  (2015)
Evidence points out that "Nanotyrannus" is a juvenile Tyrannosaurus rex.
PeerJ PrePrints 3:e1052
doi:  http://dx.doi.org/10.7287/peerj.preprints.852v1
https://peerj.com/preprints/852/



In this paper, I comment on Larson's 2013 paper "The case for
Nanotyrannus". All the osteological differences proposed by Larson
(2013) seem to be due to ontogeny and individual variation. Therefore,
Larson's claim that "Nanotyrannus lancensis" is not a juvenile
Tyrannosaurus rex is incorrect. And based on their striking anatomical
similarities, it is more parsimonious to assume that "Nanotyrannus
lancensis" is the junior synonym of Tyrannosaurus rex and represents a
juvenile stage of the taxon.