Image of Tylocidaris (Tylocidaris) ohshimai (Ikeda 1935)
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Tylocidaris subgen. Tylocidaris Pomel 1883

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Tylocidaris is a subgenus of echinoderms in the family Psychocidaridae. This subgenus is extinct. Dead Tylocidaris form shallow marine sediments. They are omnivores.

  • 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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EOL has data for 10 attributes, including: