Ivantosaurus

Ivantosaurus is an extinct genus of therapsid that lived in Russia during the Wordian stage of the Permian period, named in honor of paleontologist Ivan Antonovich Efremov.

[1] Ivantosaurus is based on a very fragmentary skull, consisting of 2 partial maxillae and a quadrate.

[1] The specimen was discovered in the Perm Region of the Ochersky District, Russia.

[1] Two canine teeth are set side-to-side in Ivantosaurus' jaw and with their axes inclined forward.

There are few known animals, living or extinct, with two sets of canines (it would be a very inefficient chewing mechanism).