Agilodocodon

Agilodocodon scansorius Temporal range: Middle Jurassic PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Synapsida
Order:	Therapsida
Suborder:	†Docodonta
Genus:	Agilodocodon
Species:	A. scansorius
Binomial name
Agilodocodon scansorius Meng et al., 2015

Agilodocodon scansorius was a shrew-sized docodont from the Middle Jurassic, believed to be the earliest known tree-climbing mammaliaform.^[1]

Appearance

Agilodocodon scansorius measured approximately 13 centimeters from head to tail, weighing about 27 grams.^[1] Its appearance was similar to a squirrel, with a long snout, curved, horny claws and flexible ankle and wrist joints typical of modern arboreal mammals.^[1] The front teeth were spade-like, indicating that Agilodocodon scansorius could gnaw tree bark and consume gum or sap.^[1] The evolutionary biologist Frietson Galis, however, questioned whether Agilodocodon scansorius gnawed bark and ate tree sap, saying its teeth "are quite different" from the modern sap-eating monkeys, and the long, thin lower jaw seems too weak for chomping on tree bark.^[1]

Discovery

The fossil of Agilodocodon scansorius, holotype BMNH 001138, along with that of Docofossor brachydactylus, was originally found by farmers in the Chinese Tiaojishan Formation and acquired by the Beijing Museum of Natural History. The type species Agilodocodon scansorius was named and described in the journal Science in 2015. The generic name refers to the membership of the Docodonta and the agility. The specific name refers to the scansorial lifestyle.^[2]

References

1. Michael Balter (12 Feb 2015). "Found: Two sophisticated mammals that thrived during the age of the dinosaurs". Science. Retrieved 13 Feb 2015.
2. Qing-Jin Meng; Qiang Ji; Yu-Guang Zhang; Di Liu; David M. Grossnickle; Zhe-Xi Luo (2015). "An arboreal docodont from the Jurassic and mammaliaform ecological diversification". Science 347 (6223): 764–768. doi:10.1126/science.1260879. Retrieved 13 Feb 2015.