Pseudobolodon was a relatively early member of the also extinct order of mammals, Multituberculata.

It lived in Portugal during the Upper Jurassic, part of the "age of the dinosaurs."

The genus Pseudobolodon ("false Bolodon") was named by Hahn G. in 1977 based on two species.

As for the septomaxilla mentioned in the title of the reference: "A small, triangular bone is placed between the premaxilla and the maxilla; this bone is interpreted as a septomaxilla.

The premaxilla is the front bit of your upper jaw, while the maxilla is the side of it.