Lazarus taxon

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In paleontology, a Lazarus taxon (plural taxa) is a taxon that disappears from one or more periods of the fossil record, only to appear again later. The term refers to the New Testament story of Lazarus, in which Jesus miraculously raises Lazarus from the dead. Lazarus taxa are observational artifacts that appear to occur either because of (local) extinction, later resupplied, or as a sampling artifact. If the extinction is conclusively found to be total (global or worldwide) and the supplanting species is not a lookalike (an Elvis species), the observational artifact is overcome. The fossil record is inherently imperfect (only a very small fraction of organisms become fossilized) and contains gaps not necessarily caused by extinction, particularly when the number of individuals in a taxon becomes very low. If these gaps are filled by new fossil discoveries, a taxon will no longer be classified as a Lazarus taxon.

The terms "Lazarus effect" or "Lazarus species" have also found some acceptance in neontology — the study of extant organisms, as contrasted with paleontology — as an organism that is rediscovered alive after having been widely considered extinct for years (a recurring IUCN Red List species for example). Examples include the Wollemi pine, the Jerdon's courser, the ivory-billed woodpecker (disputed), the Mahogany Glider and the takahē, a flightless bird endemic to New Zealand.^[1] It should be noted, however, that being "extinct" strongly relates to the sampling intensity and the whims of the IUCN, and that such a period of apparent extinction is too short for species to be designated as "Lazarus taxa" (in its paleontological meaning).

Lazarus taxa that reappear in nature after being known only as old enough fossils can be seen as an informal subcategory of the journalist's "living fossils", because a taxon cannot become globally extinct and reappear. If the original taxon went globally extinct, the new taxon must be an Elvis taxon. On the other hand, all species "correctly considered living fossils" (with all conditions fulfilled, living and found through a considerable part of the geologic timescale) cannot be Lazarus taxa.

Contents 1 Reappearing species 1.1 Reappearing IUCN red list species 1.2 Reappearing fossil taxa 2 See also 3 References

[edit] Reappearing species

[edit] Reappearing IUCN red list species

• Plants
  • Mount Diablo buckwheat (Eriogonom truncatum) — Thought extinct around 1935 but found again in 2005.
  • Furbish's lousewort (Pedicularis furbishiae) - Canadian species identified as an extinct species in 1880, rediscovered in the 1970s.
  • Camellia piquetiana, long known only from 19th century herbarium specimens labeled as Thea piquetiana until it was rediscovered in Vietnam in 2003
• Invertebrates
  • Madeiran land snail (Discus guerinianus) — Thought extinct in 1996 but found again in 1999.
  • Lord Howe Island stick insect (Dryococelus australis) — Rediscovered in 2001.
  • Giant Palouse earthworm (Driloleirus americanus); thought extinct in 1980s, but found again in 2006.
  • Xylotoles costatus, New Zealand longhorn beetle, considered extinct from 1986 to 1996, found again on Chatham Islands^[2]
  • Prionomyrmex macrops, Australian ant discovered in 1931, not seen again until 1977.
  • Canterbury knobbed weevil (Karocolens tuberculatus), last seen in 1922 until it was rediscovered near Lake Tekapo in December 2004.
• Amphibians
  • Painted frog (Atelopus ebenoides marinkellei) Believed extinct 1995, rediscovered in 2006.
• Mammals
  • Fernandina rice rat (Nesoryzomys fernandinae) — Thought extinct in 1996 (last seen 1980) but found again in late 1990s.
  • Bavarian pine vole (Microtus bavaricus) - believed extinct in the 1960s, but rediscovered in 2000.
  • Woolly flying squirrel (Eupetaurus cinereus) - known only from pelts collected in Pakistan in the late nineteenth century, until live specimens were collected in the 1990s.
  • Gilbert's Potoroo (Potorous gilbertii), extremely rare Australian mammal presumed extinct from 1800s until 1994.
  • New Holland Mouse (Pseudomys novaehollandiae) was first described by George Waterhouse in 1843, it vanished from view for over a century before its rediscovery in Ku-ring-gai Chase National Park north of Sydney, in 1967.
  • Tammar Wallaby (Macropus eugenii eugenii), this Australian subspecies was presumed extinct from 1925 until genetically matched with imported species in New Zealand in 1998.
  • Cuban Solenodon (Atopogale cubanus), thought to have been extinct until a live specimen was found in 2003.
• Birds
  • Ivory-billed woodpecker (Campephilus principalis) — Thought extinct circa 1987 before unconfirmed sightings in 1999 and 2004.
  • Jerdon's Courser (Rhinoptilus bitorquatus) — A wader from India, assumed extinct until 1986.
  • Madagascar serpent-eagle (Eutriorchis astur) - rediscovered in 1993, sixty years since the previous sighting.
  • Grand Comoro scops-owl (Otus pauliani).
  • Takahe (Porphyrio hochstetteri) — Assumed extinct in 1898 but found again in 1948.
  • New Zealand storm-petrel — Believed extinct from 1850 but sighted again in 2003.
  • Bermuda Petrel or "Cahow" (Pterodroma cahow) — Thought extinct since 1620 until three dozen were found in 1951 on a remote, uninhabited rock outcropping in Bermuda.
  • Forest Owlet (Heteroglaux blewitti) — Assumed extinct in the 19th century, but rediscovered in central India in 1997.
  • Night Parrot (Pezoporus occidentalis), extremely rare Australian bird presumed extinct from 1880s until 1990.
  • Edwards's Pheasant (Lophura edwardii), a Vietnamese pheasant presumed extinct from 1928 was rediscovered in 1998.
  • Madagascar Pochard (Aythya innotata), thought extinct since 1991 until a small group were spotted in 2006.
  • Caatinga Woodpecker (Celeus obrieni), a Brazilian woodpecker feared extinct after no specimen had been found since its discovery in 1926. Rediscovered in 2006.
  • Large-billed Reed-warbler (Acrocephalus orinus), a warbler rediscovered in Thailand in 2006, previous known only from a specimen collected in India in 1867.
  • Utila Chachalaca (Ortalis vetula deschauenseei), subspecies of the Plain Chachalaca from Honduras, not recorded between 1963 and 2000 and confirmed with a photograph in 2005

[edit] Reappearing fossil taxa

• Coelacanth (Latimeria), a member of a clade (Coelacanthimorpha) thought to have gone extinct 80 million years ago; found in 1938.
• Laotian Rock Rat (Laonastes aenigmamus), a member of a clade (Diatomyidae) thought to have gone extinct 11 million years ago; found in 1996.
• Monito del Monte (Dromiciops), a member of a clade (Microbiotheria) thought to have gone extinct 11 million years ago.
• Lazarussuchus, an Oligocene member of a clade of freshwater reptiles (Choristodera) thought to have gone extinct at the end of the Mesozoic. As Lazarussuchus is thought to be outside the clade including other choristoderans, it may indicate a ghost lineage going back to the Late Triassic, a span of over 170 million years.
• Gracilidris, a genus of dolichoderine ants thought to have gone extinct 15-20 million years ago was found in Paraguay, Brazil, and Argentina and described in 2006.

[edit] See also

• Elvis taxon
• Living fossil
• List of extinct animals
• List of fossil sites (with link directory)

[edit] References

1. ^ Shuker, Karl P N (2002). The New Zoo: New and Rediscovered Animals of the Twentieth Century. House of Stratus. 
2. ^ C.A. McGuinness (2004). Xylotoles costatus. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 17 March 2007.

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ast:Taxón de Lazarus

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