When is a species presumed to be extinct




















The last sighting of the species was in , based on interviews with 70 hunters, and extensive camera trapping during the s failed to detect its presence.

It was officially declared extinct in Based on sightings on two separate occasions by two sets of wildlife rangers, the evidence is compelling. But whether the Formosan Clouded Leopard has really risen from the dead will require considerably more effort to prove. Portsmouth Climate Festival — Portsmouth, Portsmouth. Edition: Available editions United Kingdom. Search Search. Home United States U. Africa 54 - November 11, VOA Africa Listen live.

VOA Newscasts Latest program. VOA Newscasts. Previous Next. VOA News. VOA News Subscribe. Its rainforest habitat has been severely degraded by invasive plants and goats, as well as fires. Roystonea stellate —Scientists only collected this Cuban palm tree a single time, back in Several searches have failed to uncover evidence of its continued existence, probably due to conversion of its only habitats to coffee plantations.

Jalpa false brook salamander Pseudoeurycea exspectata —Small farms, cattle grazing and logging appear to have wiped out this once-common Guatemalan amphibian, last seen in Faramea chiapensis —Only collected once in , this Mexican plant lost its cloud-forest habitat to colonialism and deforestation. Euchorium cubense —Last seen in , this Cuban flowing plant—the only member of its genus—has long been assumed lost. The IUCN characterized it as extinct in along with Banara wilsonii , another Cuban plant last seen in before its habitat was cleared for a sugarcane plantation.

Its previous habitat has been the site of frequent fires. It was probably wiped out by a wide range of habitat-degrading factors, including pollution, unsustainable fishing and near-complete deforestation around nearby rivers. Eriocaulon jordanii —This grass species formerly occurred in two known sites in coastal Sierra Leone, where its previous habitats were converted to rice fields in the s. Amomum sumatranum —A relative of cardamom, this plant from Sumatra was only scientifically collected once, back in , and the forest where that sample originated has now been completely developed.

Lost shark Carcharhinus obsoletus —This species makes its second annual appearance on this list. Cora timucua —This lichen from Florida was just identified from historical collections through DNA barcoding. Unfortunately no new samples have been collected since the turn of the 19th century. Dama gazelle Nanger dama in Tunisia —This critically endangered species still hangs on in a few other countries, and in captivity, but the death of the last individual in Tunisia marked one more country in which the gazelle has now been extirpated and serves as a stark reminder to keep the rest from fading away.

This essay first appeared on The Revelator on January 6, John R. Platt is the editor of The Revelator. An award-winning environmental journalist, his work has appeared in Scientific American, Audubon, Motherboard, and numerous other magazines and publications.

His "Extinction Countdown" column has run continuously since and has covered news and science related to more than 1, endangered species. John lives on the outskirts of Portland, Ore. Follow John R. Platt on Twitter. Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue. See Subscription Options. Go Paperless with Digital.



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