Tanım: 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 life cycle and life form.
Perisseiasphaeridium R. J. Davey & G. L. Williams 1966 alan adının bilinen örnekleri, toplanan örnekleri ve gözlemleri. Bu türleri GBIF'de görüntüleyin
