Takikawa sea cow

The Takikawa sea cow (Hydrodamalis spissa) is an extinct herbivorous marine mammal of the Late Pliocene, which was closely related to the recently extinct Steller's sea cow (H. gigas). In 1988, fossils of sea cows were discovered in Hokkaido, but were originally assigned to the Takikawa sea cow,[1] a newly described species, even though this taxon is thought of by some scientists as a synonym of the Cuesta sea cow (H. cuestae). It is uncertain whether or not the Takikawa sea cow was simply a local variant of the Cuesta sea cow or a completely separate lineage.[1][2][3] However, Steller's sea cow and the Takikawa sea cow share more morphological similarities than between the Takikawa sea cow and the Cuesta sea cow.[4]

Relations within Hydrodamalinae
Sirenia
 

†Dusisiren reinharti

 
 
 

†Dusisiren jordani

 
 
 

†Dusisiren dewana

 
 
 

†Dusisiren takasatensis

 
 
 

†Hydrodamalis cuestae

 
 
 

†Hydrodamalis spissa

 
 
 

†Hydrodamalis gigas

 
 
 
 
 
 
 
 
Based on a 2004 study by Hitoshi Furusawa[4]

Takikawa sea cow
Temporal range: Late Pliocene 3.6–2.6 Ma
↓
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Mammalia
Order:
Sirenia
Family:
Dugongidae
Subfamily:
†Hydrodamalinae
Genus:
†Hydrodamalis
Species:
†H. spissa

Furusawa, 1988
Synonyms

?†H. cuestae Domning, 1978

References
  1. Furusawa, Hitoshi (1988). A new species of hydrodamaline Sirenia from Hokkaido, Japan. Takikawa Museum of Art and Natural History. pp. 1–73.
  2. Marsh, Helene; O'Shea, Thomas J.; Reynolds III, John E. (2011). "Steller's sea cow: discovery, biology and exploitation of a relict giant sirenian". Ecology and Conservation of the Sirenia: Dugongs and Manatees. New York: Cambridge University Press. pp. 18–35. ISBN 978-0-521-88828-8.
  3. Furusawa, Hitoshi (1990). "Discovery and significance of the Takikawa sea cow (Hydrodamalis spissa) from Numata-cho, Uryu-gun, Hokkaido, Japan". Earth Science. 44 (4): 224–228.
  4. Furusawa, Hitoshi (2004). "A phylogeny of the North Pacific Sirenia (Dugongidae: Hydrodamalinae) based on a comparative study of endocranial casts". Paleontological Research. 8 (2): 91–98. doi:10.2517/prpsj.8.91.


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