Jeholotriton paradoxus WANG, 2000

Taxonomy

Salamander

Kingdom: Animalia
Phylum: Chordata
Class: Amphibia Gray 1825
Order: Urodela Duméril, 1806
Family: Incertae sedis
Genus: Jeholotriton
Species: Jeholotriton paradoxus
Author Citation WANG, 2000

Geological Time Scale

Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Middle
International Age: Bathonian

Stratigraphy

Haifanggou Formation

Provenance

Collector: T. Bastelberger
Date Collected: 06/01/2013
Acquired by: Field Collection

Dimensions

Length: 14 cm

Location

Daohugou
Ningcheng County
Nei Mongol
China

• daohugou
• jeholotriton
• nei mongol
• ningcheng
• tff-oilshale-ch943

Comments

Taxonomy from Wang & Rose 2005.
Revised diagnosis from Wang & Rose 2005, p. 524: "Mesozoic salamander showing combination of larval and adult features indicating neoteny or incomplete metamorphosis. Larval features include: external gills; toothbearing coronoid; larval-shaped pterygoid; short maxillary arcade with underdeveloped maxilla. Adult features include: extensive medial contact of nasals; posteriorly directed, dentigerous vomerine bar in the palate. Differing from other Mesozoic salamanders in the following combination of character states: 15–16 presacrals; vertebrae with short transverse processes; ribs unicapitate and proximally expanded; anterior process of pterygoid directed anteromedially towards vomer, rather than anterolaterally towards posterior end of maxilla; vomer with large tooth patch anteriorly and longitudinal dentigerous bar posteriorly; nasals large with no anterior notch; frontal with no anterolateral extension; alary process of premaxilla about two-fifths width of premaxilla; phalangeal formulae of 2-2-3-2 and 2-2-3-3-2 for manus and pes, respectively."

Line drawing from Wang & Rose 2005, p. 528:

Identified by oilshale.

References:

Wang, Y.  (2000) A new salamander (Amphibia: Caudata) from the Early Cretaceous Jehol Biota. Vertebrata PalAsiatica 38:100-103.
Wang, Y. and Rose, Ch. (2005) JEHOLOTRITON PARADOXUS (AMPHIBIA: CAUDATA) FROM THE LOWER CRETACEOUSOF SOUTHEASTERN INNER MONGOLIA, CHINA. Journal of Vertebrate Paleontology 25(3):523–532, September 2005.
Carroll, R. &  Zheng, A. (2012) A neotenic salamander, Jeholotriton paradoxus, from the Daohugou Beds in Inner Mongolia. Zoological Journal of the Linnean Society 164(3) · March 2012.
 Ke-Qin Gao, Jianye Chen, and Jia Jia (2013) Taxonomic diversity, stratigraphic range, and exceptional preservation of Juro-Cretaceous salamanders from northern China. Can. J. Earth Sci., Vol. 50, 2013 pp. 255-276.
Donge LiPing, HUANG DiYing & WANG Yuan (2012): Two Jurassic salamanders with stomach contents from Inner Mongolia, China. Chinese Science Bulletin January 2012 Vol.57 No.1: 72-76.