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Gulf snapping turtle : ウィキペディア英語版
Gulf snapping turtle

The Gulf snapping turtle or Lavarack's turtle (''Elseya lavarackorum'') is a large species of freshwater turtle in the sidenecked family Chelidae.〔Georges, A. & Thomson, S. 2010. (Diversity of Australasian freshwater turtles, with an annotated synonymy and keys to species. ) Zootaxa 2496: 1–37.〕 It is endemic to northern Australia in north-west Queensland and north-east Northern Territory.〔 The species is totally aquatic coming ashore to lay eggs and bask only, as is typical of the members of the Australian snapping turtles (''Elseya'').〔Cann, J 1998, Australian freshwater turtles, Beaumont, Singapore.〕 The Gulf snapping turtle is chiefly a herbivore consuming ''pandanus'' and figs.〔
==Taxonomy==
The species was first described in 1994, as ''Emydura lavarackorum'', from fossil material from Riversleigh in North West Queensland.〔 It was later demonstrated on the basis of the anatomy of the anterior bridge struts that it actually belonged to the genus ''Elseya'' and further to a living, although undescribed form.〔 The species was also declared at this time to be Australia's first living fossil freshwater turtle and an extant population of a Pleistocene taxon. The later managed significant public attention to this species with a story appearing in Discover Magazine in January, 1997.〔Zimmer, C. 1997. (Shell Game ) Discover Magazine 1997(1)〕 After placing this species in the correct genus it became possible to look at the deeper phylogeny of the ''Elseya'' and this species lends its name to the group within the ''Elseya'' known as the Queensland ''Elseya'' or ''Elseya lavarackorum'' group.〔Thomson, S., Georges, A. and C. Limpus (2006). A New Species of Freshwater Turtle in the Genus ''Elseya'' (Testudines: Chelidae) from Central Coastal Queensland, Australia. ''Chelon. Conserv. Biol.'' 5 (1): 74–86. (PDF fulltext )〕 This is a unique group of species that includes ''Elseya lavarackorum'' along with ''Elseya albagula'' and ''Elseya irwini'' that are all highly divergent from the ''Elseya dentata'' group.〔〔〔

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