Chelodina, collectively known as snake-necked turtles, is a large and diverse genus of long-necked chelid turtles with a complicated nomenclatural history. Although in the pastMacrochelodina and Macrodiremys have been considered separate genera and prior to that all the same, they are now considered subgenera of the Chelodina. Chelodina is an ancient group of chelid turtles native to Australia, New Guinea, the Indonesian Rote Island, and East Timor. The turtles within this subgenus are small to medium-sized, with oval shaped carapace. They are side-necked turtles, meaning they tuck their head partially around the side of their body when threatened instead of directly backwards. Chelydera represents those species that have often been termed the Chelodina B group, or thick necked snake neck turtles. The subgenus was described in 2020 by Thomson & Georges they are a side-neck turtle of the family Chelidae with extremely long necks and long flattened heads. They are specialist fish eaters using a strike and gape mode of feeding. They are medium to large species with the largest Chelodina expansa reaching shell lengths of some. The first fossils are known from Queensland from the Eocene period. Macrochelodina is a monotypic genus recently split off from the rest of the Chelodina. Its sole member is the enigmatic Chelodinaoblonga from Western Australia.
Taxonomy
Current taxonomy follows that of Georges & Thomson, 2010 with updates from van Dijk et al. 2014. Synonymous names for the ChelodinaFitzinger 1826 genus include: Hydraspis Bell 1828, Chelyodina Agassiz 1846:79, Hesperochelodina Wells and Wellington 1985. The type species for the Chelodina subgenus is Chelodina longicollis. The type species for the Chelydera subgenus is Chelodina parkeri Rhodin and Mittermeier 1976. The type species for Macrochelodina is Chelodina oblonga Gray 1841.
Chelodina alanrixi de Broin and Molnar, 2001 is a species of snake-necked fossil turtle which was described in 2001 using material gathered in Redbank Plains, Queensland, Australia. It is a member of the Chelidae Pleurodira. The fossil has been dated to the Eocene Epoch.
Chelodina insculpta de Vis, 1897 is an extinct species of snake-necked turtle that was described in 1897 from material gathered in Darling Downs, Queensland, Australia, restricted. It is a member of the Chelidae; Pleurodira. The fossil has been dated as Pliocene to Pleistocene.
Chelodina murrayi Yates, 2013 is an extinct species of snake-necked turtle from the Waite Formation on the Alcoota Scientific Reserve, north-east of Alice Springs in the Northern Territory of Australia. The species would appear to belong to the Chelodina novaeguineae group of species within the subgenus Chelodina.
