Identification of Claws/Unguals from the Hell Creek/Lance Formations

[Troodon]

Hell Creek / Lance Tyrannosaur hand bones

 

Adult T-rex Hand claws:  Top  Left digit I, Right Digit II

 

Adult Nannotyrannus Hand claws: Bottom Left Digit I, Right Digit II

 

 

Metacarpal I

 

Juvie Nanotyrannus Left Hand

 

 

Juvie Nanotyrannus on top of adult

 

Juvie Nanotyrannus (middle) compared to Adult T-rex : Top Wyrex, Bottom Sue

 

Sue &  Wyrex are all roughly circular in crossection, Nanotyrannus clearly triangular!

[Meatasaurus93]

A wonderful resource and beautiful collection! This topic helped me out with a recent purchase.

 

Thanks for all your contributions to the forum!

[Troodon]

2 hours ago, Meatasaurus93 said:

A wonderful resource and beautiful collection! This topic helped me out with a recent purchase.

 

Thanks for all your contributions to the forum!

Thanks that was the intended purpose, glad it was helpful

[Troodon]

Avian, bird Claws from this fauna are often mistaken for Theropod but a recent publication can help shed some light on one Avisaurus archibaldi.   Like I did with Troodon we look at other faunas to compare against since nothing appears to be described from the HC.   Here we have an Avisauridae from the Kaiparowits Fm of Utah that appears to be a good representation of the HC/Lance Avisaurus spp. .

 

Scale: 0.5 cm

 

Atterholt, J., Hutchison, J.H., O'Connor, J.K (2018) "The most complete enantiornithine from North America and a phylogenetic analysis of the Avisauridae" PeerJ November 13, 2018

 

From my collection think its one 

[Troodon]

Small Microraptorians are most likely present in these faunas but nothing is described.   Here we have a foot claw from an early cretaceous, Barremian, species Zhongjianosaurus from China.  The morphology looks similar to its larger Dromaeosaurid cousins just a lot smaller

 

Scale: 5 mm

 

Xu, Xing; Qin, Zi-Chuan (2017). "A new tiny dromaeosaurid dinosaur from the Lower Cretaceous Jehol Group of western Liaoning and niche differentiation among the Jehol dromaeosaurids"