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Christmas Island forest skink

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Species of lizard

Christmas Island forest skink
1900 monograph of three Christmas Island reptiles, with the forest skink in the centre
Conservation status

Extinct (2017)  (IUCN 3.1)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Scincidae
Genus: Emoia
Species: †E. nativitatis
Binomial name
†Emoia nativitatis
(Boulenger, 1887)
Synonyms

Lygosoma nativitatis Boulenger, 1887

The Christmas Island forest skink (Emoia nativitatis), also known as the Christmas Island whiptail skink, is an extinct species of skink formerly endemic to Australia's Christmas Island. As of 2017, it is listed as extinct on the IUCN Red List. The last known forest skink, a captive individual named Gump, died on 31 May 2014.

Description

The Emoia skinks are a large group with marked radiation on islands in the Pacific. The forest skink is about 20 cm long, thickset, ground-dwelling, and active during the day. Its body is a chocolate-brown colour and unpatterned. The species was found in forest clearings, usually in leaf litter.

Discovery

The Christmas Island forest skink was described by George Albert Boulenger in 1887 based on a single tailless specimen. Subsequently, eight specimens were collected by naturalist Joseph Jackson Lister.

Decline and extinction

The Christmas Island forest skink was common and widespread on Christmas Island during most of the twentieth century. It was considered abundant in 1979. As recently at 1998, herpetologist Hal Cogger observed more than 80 forest skinks basking and foraging around a single fallen tree. However, populations plummeted during the 1990s and 2000s by up to 98%. In 2003, the species was limited to fragmented pockets in remote parts of the island, and a targeted survey in 2008 found the species at only a single site.

The cause of the species' rapid decline is still unknown, although possibilities include predation by yellow crazy ants, giant centipedes, wolf snakes, and cats; competition with five introduced reptile species; poisoning from insecticides; and disease.

In the late 2000s, Christmas Island researchers tried to capture forest skinks for a captive breeding program, but only three females were ever found. On 3 January 2014, the species was added to the EPBC Act List of Threatened Fauna. The last surviving captive female was nicknamed Gump, and she died on 31 May 2014.

Following Gump's death, herpetologists John Woinarski and Hal Cogger wrote that: "For the Forest Skink, the trajectory of decline and the fruitlessness of dedicated searches provide reasonable grounds to presume extinction, although this conclusion may take some years to be officially recognised." If true, this would represent Australia's first reptile extinction since European colonisation. In 2017, the Christmas Island forest skink was listed as Extinct on the IUCN Red List.

Evolutionary relationships

A 2018 genetic analysis found that it was most closely related within Emoia to Emoia boettgeri, native to Micronesia in the Pacific, over 4000 kilometers away, with an estimated divergence around 13 million years ago, during the Late Miocene. The clade containing these two taxa in turn formed a clade with the atrocostata group.

See also

References

  1. ^ Cogger, H; Woinarski, J (2017). "Emoia nativitatis". The IUCN Red List of Threatened Species. doi:10.2305/IUCN.UK.2017-3.RLTS.T178595A101749951.en.
  2. Emoia nativitatis at the Reptarium.cz Reptile Database. Accessed 7 January 2016.
  3. ^ Woinarski, John; Driscoll, Don; Cogger, Hal (8 August 2014). "Vale 'Gump', the last known Christmas Island Forest Skink". The Conversation. Retrieved 23 June 2020.
  4. ^ John Woinarski and Hal Cogger, Australian endangered species: Christmas Island Forest Skink, The Conversation, 19 September 2013. Retrieved 26 December 2015.
  5. ^ Boulenger, GA (1888). "On the Reptiles of Christmas Island". Proceedings of the Zoological Society of London. 56 (1): 534–536. doi:10.1111/j.1469-7998.1888.tb06729.x.
  6. Smith MJ, Cogger H, Tiernan B, Maple D, Boland C, Napier F, Detto T, & Smith P (2012) "An Oceanic island reptile community under threat: The decline of reptiles on Christmas Island, Indian Ocean" Herpetological Conservation and Biology, 7(2): 206–218. Retrieved 26 December 2015.
  7. Algar, Dave; Hamilton, Neil; Pink, Caitlyn (25 December 2014). "Progress in eradicating cats (Felis catus) on Christmas Island to conserve biodiversity" (PDF). Raffles Bulletin of Zoology. 30: 45–53. Retrieved 23 June 2020.
  8. "A Science Story: Saving Christmas" Lateral magazine, 21 December 2015. Retrieved 26 December 2015.
  9. Emoia nativitatis — Christmas Island Forest Skink, Christmas Island Whiptail-skink Australian Government - Department of the Environment. Retrieved 6 December 2015.
  10. Oliver, Paul M.; Blom, Mozes P. K.; Cogger, Harold G.; Fisher, Robert N.; Richmond, Jonathan Q.; Woinarski, John C. Z. (2018-06-30). "Insular biogeographic origins and high phylogenetic distinctiveness for a recently depleted lizard fauna from Christmas Island, Australia". Biology Letters. 14 (6): 20170696. doi:10.1098/rsbl.2017.0696. PMC 6030605. PMID 29899126.
Taxon identifiers
Emoia nativitatis
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