Image of Steller's sea cow
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Steller's Sea Cow

Hydrodamalis gigas (Zimmermann 1780)

2013 Simon J. Tonge   cc-by-3.0

Hydrodamalis gigas (Steller's Sea Cow) is a species of mammals in the family dugongs. This species is extinct. They are native to Arctic Ocean and Pacific Ocean. They are herbivores. Individuals could grow to 10 m. Reproduction was viviparous. They rely on lift powered swimming to move around.

  • URI: http://eol.org/schema/terms/extinct
  • Definition: A taxon is Extinct when there is no reasonable doubt that the last individual has died. A \r\ntaxon is presumed Extinct when exhaustive surveys in known and/or expected habitat, \r\nat appropriate times (diurnal, seasonal, annual), throughout its historic range have failed \r\nto record an individual. Surveys should be over a time frame appropriate to the taxon’s \r\nlife cycle and life form.
  • Attribution: http://www.iucnredlist.org/technical-documents/categories-and-criteria
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  • URI: https://eol.org/schema/terms/lift_based_swimming
  • Definition: Hydrofoils, or fins, are used to push against the water to create a normal force to provide thrust, propelling the animal through water. The reduction of fin cross-sectional area helps to minimize drag, and therefore increase efficiency. Regardless of size of the animal, at any particular speed, maximum possible lift is proportional to (wing area) x (speed)<sup>2</sup>. Dolphins and whales have large, horizontal caudal hydrofoils, while many fish and sharks have vertical caudal hydrofoils.
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EOL has data for 27 attributes, including:

Known occurrences, collected specimens and observations of Steller's sea cow. View this species on GBIF