Jianchangnathus

Jianchangnathus is an extinct genus of basal pterosaur from the Middle Jurassic Tiaojishan Formation of northeastern China.[1]

Not to be confused with Jianchangopterus.

Jianchangnathus
Temporal range: Middle Jurassic, 160 Ma
↓
Holotype, Paleozoological Museum of China
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Order: †Pterosauria
Family: †Rhamphorhynchidae
Subfamily: †Scaphognathinae
Genus: †Jianchangnathus
Cheng et al., 2012
Species:
†J. robustus
Binomial name
†Jianchangnathus robustus
Cheng et al, 2012

Naming

Jianchangnathus was first described and named by Cheng Xin, Wang Xiaolin, Jiang Shunxing and Alexander W.A. Kellner in 2012 and the type species is Jianchangnathus robustus. The generic name combines a reference to Jianchang County with a Greek γνάθος, gnathos, "jaw". The specific name means "robust" in Latin.[1]

Jianchangnathus is known from a single fossil skeleton, holotype IVPP V16866, recovered near Linglongta, in Jianchang County.

Description

Autapomorphies of Jiangchangnathus include: a convex top margin of the lower jaw; a large front branch of the jugal; and the first three pairs of teeth of the lower jaws pointing strongly forwards. Its describers found it to share several features with Scaphognathus, including a high front end of the lower jaws, a pear-shaped lower temporal fenestra with the broad end below and teeth in the maxilla of the upper jaw that have a space equal to that of three toothsockets between them.[1] Additionally, undescribed fossils of a pterosaur referred to Jianchangnathus suggest that the color of its pycnofibers was brown.[2]

Phylogeny

Jianchangnathus was assigned by the describers to the Scaphognathidae.[1]

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gollark: I like to confuse all by using e^(2i)-based indexing.
gollark: Anyone with other arbitrary preferences is wrong. gnobody is the function `f(x)=sinh(x²)/tan(3x)`.
gollark: But I don't arbitrarily prefer 1 indexing, I arbitrarily prefer 0.

See also

References
  1. Xin Cheng; Xiaolin Wang; Shunxing Jiang; Alexander W.A. Kellner (2012). "A new scaphognathid pterosaur from western Liaoning, China". Historical Biology. 24: 101–111. doi:10.1080/08912963.2011.635423.
  2. Li, Q., J.A. Clarke, K.-Q. Gao, C.-F. Zhou, Q. Meng, D. Li, L. D'Alba, and M.D. Shawkey. 2014. Melanosome evolution indicates a key physiological shift within feathered dinosaurs. Nature 507: 350-353.


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