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Temporal range: Late Oligocene
Macrodelphinus kelloggi.jpg
Macrodelphinus and Eurhinodelphis.
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea
Family: Eurhinodelphinidae
Genus: Macrodelphinus
Wilson 1935
M. kelloggi
Binomial name
Macrodelphinus kelloggi
Wilson 1935

Macrodelphinus is an extinct genus of primitive odontocete known from Late Oligocene (Chattian) marine deposits in California.


Macrodelphinus was an orca-sized odontocete similar to members of Eurhinodelphinidae in having a swordfish-like rostrum and upper jaw. Because of its size, and inch-long teeth, it is believed to have been an apex predator.


Macrodelphinus is known from a fragmentary skull from the Late Oligocene Jewett Sand Formation of Kern County, southern California.[1] Although often classified as a member of Eurhinodelphinidae, the cladistic analysis of Chilcacetus recovers it outside Eurhinodelphinidae, less advanced than Eoplatanista.[2] The Miocene species "Champsodelphis" valenciennesii Brandt, 1873, based on a rostrum fragment from marine sediments in Landes, France, was assigned to Macrodelphinus by Kellogg (1944).[3]


  1. ^ L. E. Wilson. 1935. Miocene marine mammals from the Bakersfield region, California. The Peabody Museum of Natural History Bulletin 4:1-143.
  2. ^ O. Lambert, C. de Muizon, and G. Bianucci. 2015. A new archaic homodont toothed cetacean (Mammalia, Cetacea, Odontoceti) from the early Miocene of Peru. Geodiversitas 37(1):79-108
  3. ^ R. Kellogg. 1944. Fossil Cetaceans from the Florida Tertiary. Bulletin of the Museum of Comparative Zoology at Harvard College XCIV(9):433-471.