Pseudobolodon
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'.
Genus: Pseudobolodon Hahn G, 1977
Species: Pseudobolodon krebsi Hahn G & Hahn R, 1994
Species: Pseudobolodon oreas Hahn G, 1977
Page references: Hahn G & Hahn R (2000), Multituberculates from the Guimarota mine, p.97-107 in Martin T & Krebs B (eds), Guimarota - A Jurassic Ecosystem, Verlag Dr Friedrich Pfeil, München.
(This information has been derived from [1] (http://home.arcor.de/ktdykes/multis.htm) Multituberculata Cope, 1884. As that's my webpage, there are no issues of copyright. Trevor Dykes)
Pseudobolodon
Scientific classification
Kingdom: Animalia
Therapsida
Class: Mammalia
Order: Multituberculata
Family: Paulchoffatiidae
Genus: Pseudobolodon Species
P. krebsi
P. oreas
Ref.
(For the more technically inclined, suborder "Plagiaulacida", family Paulchoffatiidae.)
'false Bolodon'
Remarks: A third one-time species, P. robustus Hahn, 1978, seems to have transformed into Meketibolodon robustus (Hahn G, 1978).
Place: Guimarota
Country: Portugal
Age: Kimmeridgian, Upper Jurassic
Remarks: This is based on two upper jaws.
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. This is a bone that is typical for lower tetrapods (amphibians, reptiles), but is usually absent in mammals", (Hahn & Hahn 2000, p.98). The premaxilla is the front bit of your upper jaw, whilst the maxilla is the side of it. Like other existing mammals, you don't have this septomaxilla.
Reference: Hahn & Hahn (1994), Nachweis des Septomaxillare bei Pseudobolodon krebsi n.sp. (Multituberculata) aus dem Malm Portugals, p.9-29, in Miscellanea Palaeontologica 3. - 531 p., 67 pl., Berl. Geowiss. Abh. Vol 13, editors Kohring R & Martin T.
(Evidence of the septomaxilla in Pseudobolodon krebsi n.sp. (Multituberculata) from the Malm of Portugal.)
Place: Guimarota
Country: Portugal
Age: Kimmeridgian, Upper Jurassic
Remarks: Known from seven upper jaws.
Reference: Hahn G (1977), Neue Schädel-Reste von Multituberculaten (Mamm.) aus dem Malm Portugals. Geologica et Palaeontologica, 11, p.161-186.
(New skull remains of Multituberculates (Mammalia) from the Malm of Portugal.)
Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p.389-429.