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When is a taxon said to be extinct?...

When is a taxon said to be extinct?

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(i) A taxon is Extinct when there is no reasonable doubt on the death of the last individual.
(ii) A taxon is presumed Extinct when exhaustive surveys in known and/ or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual.
Example: Neuracanthus neesianus.
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