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Lazarus taxon

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Title: Lazarus taxon  
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Lazarus taxon

The takahe of New Zealand had not been seen since 1898 when it was 'rediscovered' in 1948.

In paleontology, a Lazarus taxon (plural taxa) is a taxon that disappears for one or more periods from the fossil record, only to appear again later. The term refers to the story in the Christian biblical Gospel of John, in which Jesus Christ raised Lazarus from the dead.

Contents

  • Potential explanations 1
  • Related but distinct concepts 2
  • Reappearing fossil taxa 3
  • Reappearing IUCN red list species 4
    • Plants 4.1
      • Cultivars 4.1.1
    • Protostomes 4.2
    • Fish 4.3
    • Amphibians 4.4
    • Mammals 4.5
    • Reptiles 4.6
    • Birds 4.7
    • Mollusca 4.8
  • See also 5
  • References 6
  • External links 7

Potential explanations

Lazarus taxa are observational artifacts that appear to occur either because of (local) extinction, later resupplied, or as a sampling artifact. The fossil record is inherently sporadic (only a very small fraction of organisms become fossilized, and an even smaller fraction discovered before destruction) and contains gaps not necessarily caused by extinction, particularly when the number of individuals in a taxon is very low.

After mass extinctions, such as the Permian–Triassic extinction event, the Lazarus effect occurred for many taxa. However, there appears to be no link with the abundance of fossiliferous sites and the proportion of Lazarus taxa, nor have missing taxa been found in potential refuges. Therefore, reappearance of Lazarus taxa probably reflects the rebound after a period of extreme rarity during the aftermath of such extinctions.[1]

Related but distinct concepts

An Elvis taxon is a look-alike that has supplanted an extinct taxon.

A zombie taxon is a taxon that contains specimens that have been collected from strata younger than the extinction of the taxon. Later such fossils turn out to be freed from the original seam and refossilized in a younger sediment. For example, a trilobite that gets eroded out of its Cambrian-aged limestone matrix, and reworked into Miocene-aged siltstone.

A living fossil is an extant taxon that appears to have changed so little compared with fossil remains, that it is considered identical. Living fossils may occur regularly in the fossil record, such as the lampshell Lingula, though the living species in this genus are not identical to fossil brachiopods.[2]

Other living fossils however are also Lazarus taxa if these have been missing from the fossil record for substantial periods of time, such as applies for coelacanths.

Finally, the term "Lazarus species" is applied to organisms that have been rediscovered as being still alive after having been widely considered extinct for years, without ever having appeared in the fossil record. In this last case, the term Lazarus taxon is applied in neontology.

Animals that are Lazarus taxa are often cited by cryptozoologists as former cryptids.[3][4]

Reappearing fossil taxa

Coelacanth Latimeria chalumnae
  • Chacoan peccary (Catagonus wagneri), known only from fossils before its discovery in 1975.[5]
  • Coelacanth (Latimeria), a member of a subclass (Actinistia) thought to have gone extinct 66 million years ago; live specimens found in 1938.
  • Nightcap oak (Eidothea hardeniana and E. zoexylocarya), representing a genus previously known only from fossils 15 to 20 million years old, were recognized in 1995 and 2000, respectively.
  • 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.
  • Laotian rock rat (Laonastes aenigmamus), a member of a family (Diatomyidae) thought to have gone extinct 11 million years ago; found in 1996.[6]
  • Majorcan midwife toad (Alytes muletensis), described from fossil remains in 1977, living animals discovered in 1979.
  • Dawn redwood (Metasequoia), a genus of conifer, was first described as a fossil from the Mesozoic Era by Shigeru Miki in 1941, but in 1944 a small stand was discovered in China in Modaoxi by Zhan Wang.
  • Monito del monte (Dromiciops), a member of a clade (Microbiotheria) thought to have gone extinct 11 million years ago.
Lazarus taxa reflect the sporadic nature of the fossil record
  • Monoplacophora, a class of molluscs believed to have gone extinct in the middle Devonian Period (c. 380 million years ago) until living members were discovered in deep water off Costa Rica in 1952.
  • Mountain pygmy possum (Burramys parvus), Australia's only truly hibernating marsupial, known originally from the fossil record and then discovered in 1966.
  • Schinderhannes bartelsi, a Devonian member of Anomalocarididae, a family previously known only from Cambrian fossils, 100 million years earlier.
  • Wollemi pine (Wollemia), a species previously known only from fossils from 2 to 90 million years old representing a new genus of Araucariaceae, was discovered in 1994.

Reappearing IUCN red list species

Plants

Café marron Ramosmania rodriguesii.

Cultivars

Protostomes

Fish

Amphibians

Mammals

Gilbert's potoroo.
  • Bavarian pine vole (Microtus bavaricus), believed extinct in the 1960s, but rediscovered in 2000.
  • Brazilian arboreal mouse (Rhagomys rufescens)
  • Caspian horse, thought to be descended from Mesopotamian horses which became extinct in the 7th century, but was rediscovered in the 1960s.
  • Central rock rat (Zyzomys pedunculatus)
  • Cuban solenodon (Atopogale cubanus), thought to have been extinct until a live specimen was found in 2003.
  • Fernandina rice rat (Nesoryzomys fernandinae), thought extinct in 1996 (last seen 1980) but found again in the late 1990s.
  • Gilbert's potoroo (Potorous gilbertii), extremely rare Australian mammal presumed extinct from the 19th century until 1994.
  • Miller's grizzled langur (Presbytis hosei canicrus), presumed extinct 2010, rediscovered 2012.
  • Leadbeater's possum (Gymnobelideus leadbeateri), thought to be extinct until 1965
  • Mahogany glider (Petaurus gracilis), described in 1883 and not recorded between 1886 and 1973. An expedition by the Queensland Museum in 1989 found a living population.
  • New Guinea big-eared bat (Pharotis imogene), previously, the species was believed to have been extinct since 1890, when it was last spotted. In 2012, researchers realised that a female bat collected near Kamali was a member of this species.[9]
  • Ku-ring-gai Chase National Park, North of Sydney, in 1967.
  • Philippine naked-backed fruit bat (Dobsonia chapmani), in 1996 the species was declared extinct by the IUCN, as none had been sighted since 1964, but the bat was rediscovered in 2000.
  • Santiago Galápagos mouse (Nesoryzomys swarthi ), thought extinct and last recorded in 1906, but was rediscovered in 1997.
  • Tammar wallaby (Macropus eugenii eugenii), this Australian subspecies was presumed extinct from 1925 until genetically matched with imported species in New Zealand in 1998.
  • Woolly flying squirrel (Eupetaurus cinereus), known only from pelts collected in Pakistan in the late 19th century, until live specimens were collected in the 1990s.
  • Yellow-tailed woolly monkey (Lagothrix flavicauda)

Reptiles

Arakan forest turtle.
  • Arakan forest turtle (Heosemys depressa), last seen in 1908 but found again in 1994.
  • El Hierro giant lizard (Gallotia simonyi), rediscovered in 1974
  • Gray's monitor (Varanus olivaceus), described in 1845, and not seen again by scientists for 130 years
  • La Gomera giant lizard (Gallotia bravoana), rediscovered in 1999
  • La Palma giant lizard (Gallotia auaritae), thought to have been extinct since 1500, but rediscovered in 2007.
  • New Caledonian crested gecko (Correlophus ciliatus) rediscovered in 1994.[10]
  • Terror skink (Phoboscincus bocourti), a 50-cm-long lizard, was previously known from a single specimen captured around 1870 and was long presumed extinct. In 2003, on a tiny islet, it was rediscovered.

Birds

Mollusca

  • Bermuda land snail ("Poecilozonites bermudensis"), last recorded sighting made in the early 1970s, survey in 1988 and studies in 2000, 2002, and 2004 seemed to confirm extinction, rediscovered in City of Hamilton alleyway in 2014.

See also

References

  1. ^ Wignall, P. B.; Benton, M. J. (1999). "Lazarus Taxa and Fossil Abundance at Times of Biotic Crisis". Journal of the Geological Society 156.  
  2. ^ Emig, Christian C. (2008). "On the history of the names Lingula, anatina, and on the confusion of the forms assigned them among the Brachiopoda" (PDF). Carnets de Géologie [Notebooks on Geology] (Article 2008/08). 
  3. ^  
  4. ^ *Heuvelmans, Bernard. On The Track Of Unknown Animals. (New York: Hill and Wang, 1959.
  5. ^  
  6. ^ Anita Srikameswaran (June 15, 2006). "Retired professor tracks down rodent thought to be extinct".  
  7. ^ C.A. McGuinness (2004). Xylotoles costatus. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 17 March 2007.
  8. ^ Miguel Carles-Tolrá, Pablo C. Rodríguez & Julio Verdú (2010). "Thyreophora cynophila (Panzer, 1794): collected in Spain 160 years after it was thought to be extinct (Diptera: Piophilidae: Thyreophorini)". Boletín de la Sociedad Entomológica Aragonesa (S.E.A.) 46: 1–7.
  9. ^ Gates, Sara (4 June 2014). "Presumed Extinct Bat Found In Papua New Guinea After 120 Years". Huffington Post. Retrieved 29 April 2015. 
  10. ^ De Vosjoli, Phillipe; Repashy, Allen; Fast, Frank (2003). Rhacodactylus: The Complete Guide to their Selection and Care. Advanced Vivarium Inc.  
  11. ^ Gehrman, Rare Birds.
  12. ^ Extraordinary Tale of the Bermuda Petrel and the Man Who Brought It Back from Extinction" (Boston: Beacon Press, 2012).
  13. ^ Ghost Bird 2009.

External links

  • (Boston: Beacon Press, 2012).Rare Birds: The Extraordinary Tale of the Bermuda Petrel and the Man Who Brought It Back from ExtinctionGehrman, Elizabeth.
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