Cryodrakon boreas: new Canadian azhdarchid

Hone, Habib and Therrien 2019
bring us news of several bones from several individuals of various sizes of a new Canadian azhdarchid, Cryodrakon boreas (Fig. 1).

From the NatGeo webpage:
“For a long time [30+ years] paleontologists had instead assumed that the fossils belonged to a pterosaur called Quetzalcoatlus northropi [Figs. 1, 2], says study coauthor Dave Hone, a paleontologist at Queen Mary University of London.”

Figure 1. Cryodrakon humerus compared to Q sp. specimen (the small one). Yes, they are different. Zhejiangopterus also has a straight humerus shaft.

Figure 1. Cryodrakon humerus compared to Q sp. specimen (the small one). Yes, they are different. Zhejiangopterus also has a straight humerus shaft.

Here it took less than 2 minutes
to compare the humerus of Cryodrakon to that of Quetzalcoatlus (Fig. 1). Yes, they are different. Zhejiangopterus (Fig. 3) also has a straight humerus, like that of Cryodrakon.

Figure 1. Estimating giant azhdarchid weight from estimated height and comparables with similar smaller taxa.

Figure 2. Estimating giant azhdarchid weight from estimated height and comparables with similar smaller taxa.

From the Royal Tyrrell Museum webpage:
“The partial skeleton represents a young animal with a wingspan of about five metres, but one isolated giant neck bone from another specimen suggests that Cryodrakon could have reached a wingspan of around 10 metres when fully grown.”

Partial skeleton =
part of the wings, legs, neck and a rib. So, not a lot, but enough.

Figure 2. The large azhdarchid pterosaur, Zhejiangppterus. is shown walking over large pterosaur tracks matched to its feet from Korea (CNUPH.p9. Haenamichnus. (Hwang et al. 2002.)

Figure 3. The large azhdarchid pterosaur, Zhejiangppterus. is shown walking over large pterosaur tracks matched to its feet from Korea (CNUPH.p9. Haenamichnus. (Hwang et al. 2002.) On second look, perhaps less elbow and knee bend here.

Looking forward to learning more
about Cryodrakon after reading the paper. All the above comes from online promotional materials.


References
Hone DWE, Habib MB and Therrien F 2019. Cryodrakon boreas, gen. et sp. nov., a Late Cretaceous Canadian azhdarchid pterosaur. Journal of Vertebrate Paleontology Article: e1649681 DOI: 10.1080/02724634.2019.1649681

www.nationalgeographic.com
www.newsweek.com

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