Although it shared some characteristics with modern amphibians

within the Besano Formation

Length 40 mm

La estructura ósea del ala está formada por huesos huecos pero densos

providing an additional form of protection or perhaps a role in thermal regulation

Arctodus pristinus Asfaltovenator Although it shared some characteristicsArctodus pristinus is an extinct species of short faced bear belonging to the genus Arctodus , which lived in North America during the Pleistocene, approximately between 2. 5 million and 10,000 years ago. It was a close relative of Arctodus simus , although smaller in size and with some morphological differences in its skeleton that suggest different ecological adaptations. Its fossil remains have been found mainly in the southeastern United States,