Ctenacodon
Scientific classification

Kingdom: Animalia
Therapsida
Class: Mammalia
Order: Multituberculata
Family: Allodontidae
Genus: Ctenacodon
Species
  C. laticeps
  C. nanus
  C. scindens
  C. serratus
  doubtful C. falconeri?
  not "C. brentbaatar"

Ref.

Ctenacodon is an extinct North American mammal that lived during the Upper Jurassic period. It's a member of the family Allodontidae within the order Multituberculata. Ctenacodon was named by Othniel Marsh in 1879. At least four species are currently recognized.

Genus: Ctenacodon Marsh OC, 1879
'comb tooth'
Aka: Allodon Marsh, 1881

Species: Ctenacodon laticeps (Marsh OC, 1881) Simpson GG, 1927
Aka: Allodon laticeps Marsh OC, 1881
Place: Morrison Formation, Wyoming
Country: USA
Age: Upper Jurassic
Remarks: The holotype, collected by Reed WH in 1880, is in the Peabody Mueum, Yale. Judging by the photo I've just acquired, the jaw is at least partially known, (Plate 1, Kielan-Jaworowska & Hurum, 2001).
References: Simpson (1927), Mesozoic Mammalia. VII. Taxonomy of Morrison multituberculates. Am. J. Sci. (5) xiv, p.36-38.
Marsh (1881), New Jurassic mammals. Am. J. Sci. (3) xxi: p.511-513.

Species: Ctenacodon nanus Marsh OC, 1881
Place: Morrison Formation, Wyoming
Country: USA
Age: Upper Jurassic
Remarks: This type fossil is likewise at Yale.

Species: Ctenacodon scindens Simpson GG, 1928
Place: Morrison Formation, Wyoming
Country: USA
Age: Upper Jurassic
Remarks: Also at Yale and originally assigned to C. serratus.

Species: Ctenacodon serratus Marsh OC, 1879
Place: Morrison Formation, Wyoming
Country: USA
Age: Upper Jurassic
Remarks: Yale.
Reference: Marsh (1879), Notice of new Jurassic mammals. Amer. J. of Sci., 3pp., xviii, p.296-398.

Extra remarks: "Ctenacodon" brentbaatar is to be assigned to a separate genus, whilst the significance of Ctenacodon falconeri, (should it have any), is a mystery to me.

Page references: Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p.389-429.

(This information has been derived from [1] MESOZOIC MAMMALS; Basal Multituberculata, an internet directory. As that's my webpage, there are no issues of copyright. Trevor Dykes)