Temporal range: Miocene
An artist's illustration of Allodesmus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Suborder: Caniformia
Superfamily: Pinnipedia
Family: Desmatophocidae
Genus: Allodesmus
Kellogg, 1922
Referred species
  • Allodesmus courseni
  • Allodesmus gracilis
  • Allodesmus kelloggi
  • Allodesmus kernensis
  • Allodesmus megallos
  • Allodesmus packardi
  • Allodesmus sadoensis

Allodesmus is an extinct genus of pinniped from the Miocene and related to the genus Desmatophoca. It measured about 8 feet (2.4 m) long and weighed 800 pounds (360 kg). Allodesmus had the specific anatomical features found in modern polygynous pinnipeds: sexual dimorphism, strong canines for fights between bulls and teeth with well-defined growth zones, a result from periodic fasting (in order to defend their harem, males would not take to the sea to feed during the breeding season).