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* Family [[Thalassemyidae]] (extinct)
 
* Family [[Thalassemyidae]] (extinct)
 
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'''Sea Turtles''' (superfamily '''Chelonioidea''') are [[turtle]]s found in all the world's oceans except the Arctic Ocean. There are seven living species of sea turtles: [[Flatback Sea Turtle|flatback]], [[Green Sea Turtle|green sea turtle]], [[Hawksbill turtle|Hawksbill]], [[Kemp's Ridley]], [[leatherback sea turtle|Leatherback]], [[Loggerhead Sea Turtle|Loggerhead]] and [[Olive Ridley Sea Turtle|Olive Ridley]]. The East Pacific subpopulation of the green turtle was previously classified as a separate [[species]], the [[Black Sea Turtle|black turtle]], but [[DNA]] evidence indicates that it is not evolutionarily distinct from the [[green turtle]].<ref name="BlackTurtleTaxonomy">{{cite journal | last =Karl | first =Stephen H. | coauthors = Brian W. Bowen| title =Evolutionary Significant Units versus Geopolitical Taxonomy: Molecular Systematics of an Endangered Sea Turtle (genus ''Chelonia'') | journal =Conservation [[Biology]] | volume =13 | issue =5 | pages =990–999 | publisher =Blackwell Synergy | year =1999 | url=http://www.blackwell-synergy.com/doi/abs/10.1046/j.1523-1739.1999.97352.x | doi =10.1046/j.1523-1739.1999.97352.x | id = | accessdate = 2007-09-09 }}</ref> All species except the [[leatherback]] are in the family Cheloniidae; the leatherback belongs to the family [[Dermochelyidae]] and is its only member.
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'''Sea Turtles''' (superfamily '''Chelonioidea''') are [[turtle]]s found in all the world's oceans except the [[Arctic Ocean]]. There are seven living species of sea turtles: [[Flatback Sea Turtle|flatback]], [[Green Sea Turtle|green sea turtle]], [[Hawksbill turtle|Hawksbill]], [[Kemp's Ridley]], [[leatherback sea turtle|Leatherback]], [[Loggerhead Sea Turtle|Loggerhead]] and [[Olive Ridley Sea Turtle|Olive Ridley]]. The East Pacific subpopulation of the green turtle was previously classified as a separate [[species]], the [[Black Sea Turtle|black turtle]], but [[DNA]] evidence indicates that it is not evolutionarily distinct from the [[green turtle]].<ref name="BlackTurtleTaxonomy">{{cite journal | last =Karl | first =Stephen H. | coauthors = Brian W. Bowen| title =Evolutionary Significant Units versus Geopolitical Taxonomy: Molecular Systematics of an Endangered Sea Turtle (genus ''Chelonia'') | journal =Conservation [[Biology]] | volume =13 | issue =5 | pages =990–999 | publisher =Blackwell Synergy | year =1999 | url=http://www.blackwell-synergy.com/doi/abs/10.1046/j.1523-1739.1999.97352.x | doi =10.1046/j.1523-1739.1999.97352.x | id = | accessdate = 2007-09-09 }}</ref> All species except the [[leatherback]] are in the family Cheloniidae; the leatherback belongs to the family [[Dermochelyidae]] and is its only member.
   
 
Different species are distinguished by varying anatomical aspects: for instance, the prefrontal scales on the head, the number of and shape of [[scutes]] on the [[carapace]], and the type of inframarginal scutes on the [[plastron]]. The [[leatherback sea turtle|leatherback]] is the only sea turtle that does not have a hard shell; instead carrying a mosaic of bony plates beneath its leathery skin. It is the largest of the sea turtles, measuring six or seven feet (2 m) in length at maturity, and three to five feet (1 to 1.5 m) in width, weighing up to 1300 pounds (650 kg). Other species are smaller, being mostly two to four feet in length (0.5 to 1 m) and proportionally narrower.<ref name="WWFSeaturtles">{{cite web | title =WWF - Marine Turtles | work =Species Factsheets | publisher =World Wide Fund for Nature | date =[[2007-05-04]] | url =http://www.panda.org/about_wwf/what_we_do/species/about_species/species_factsheets/marine_turtles/index.cfm
 
Different species are distinguished by varying anatomical aspects: for instance, the prefrontal scales on the head, the number of and shape of [[scutes]] on the [[carapace]], and the type of inframarginal scutes on the [[plastron]]. The [[leatherback sea turtle|leatherback]] is the only sea turtle that does not have a hard shell; instead carrying a mosaic of bony plates beneath its leathery skin. It is the largest of the sea turtles, measuring six or seven feet (2 m) in length at maturity, and three to five feet (1 to 1.5 m) in width, weighing up to 1300 pounds (650 kg). Other species are smaller, being mostly two to four feet in length (0.5 to 1 m) and proportionally narrower.<ref name="WWFSeaturtles">{{cite web | title =WWF - Marine Turtles | work =Species Factsheets | publisher =World Wide Fund for Nature | date =[[2007-05-04]] | url =http://www.panda.org/about_wwf/what_we_do/species/about_species/species_factsheets/marine_turtles/index.cfm
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==Distribution==
 
==Distribution==
The [[Taxonomic rank|superfamily]] Chelonioidea has a worldwide distribution; sea turtles can be found in all oceans except for the polar regions.{{Fact|date=September 2007}} Some species travel between oceans. The Flatback turtle is found solely on the northern coast of Australia.
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The [[Taxonomic rank|superfamily]] Chelonioidea has a worldwide distribution; sea turtles can be found in all oceans except for the polar regions.{{Fact|date=September 2007}} Some species travel between oceans. The Flatback turtle is found solely on the northern coast of [[Australia]].
   
 
==Ecology and life history==
 
==Ecology and life history==

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