Kayentachelys

Kayentachelys Temporal range: Early Jurassic 196.5–183.0 Ma PreЄ Є O S D C P T J K Pg N

Life restoration
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Pantestudines
Clade:	Testudinata
Genus:	†Kayentachelys Gaffney et al., 1987
Species:	† K. aprix
Binomial name
*Kayentachelys aprix* Gaffney et al., 1987

Kayentachelys ("Kayenta shell") is an extinct genus of stem-turtle from the Early Jurassic Kayenta Formation of northern Arizona.^[1] Kayentachelys was about 0.5 m (1.6 ft) wide and 0.6 m (2.0 ft) in length. It lived in an environment dominated by streams and dunes.

Classification

Kayentachelys was originally grouped as a primitive cryptodire and part of its own family, Kayentachelyidae. Below is the classification of Kayentachelys within Cryptodira:^[1] However, later analysis showed that it was more likely to be a primitive testudinatan outside the group containing living turtles.^[2]

References

1 2 Gaffney, E.S.; Hutchinson, J.H.; Jenkins, F.A Jr.; Meeker, L.J. (1987). "Modern Turtle Origins; The Oldest Known Cryptodire" (PDF). Science 237 (4812): 289–291. doi:10.1126/science.237.4812.289. PMID 17772056.
↑ Anquetin, J. R. M. (2012). "Reassessment of the phylogenetic interrelationships of basal turtles (Testudinata)". Journal of Systematic Palaeontology 10: 3. doi:10.1080/14772019.2011.558928.

Extinct turtles

Triassic period	Pappochelys Odontochelys Proganochelys

Jurassic period	Australochelys Basilochelys Caribemys Condorchelys Dinochelys Dorsetochelys Eileanchelys Eurysternum Hispaniachelys Kayentachelys Palaeomedusa Sinaspideretes Thalassemys Uluops

Cretaceous period	Allopleuron Atlantochelys Angolachelys Anomalochelys Araripemys Archelon Bouliachelys Caririemys Cearachelys Chelosphargis Chupacabrachelys Compsemys Corsochelys Cratochelone Ctenochelys Desmatochelys Emarginachelys Foxemys Gigantatypus Gilmoremys Glyptops Jiangxichelys Kallokibotion Kinkonychelys Kirgizemys Khunnuchelys Kurmademys Liaochelys Lomalatachelys Notochelone Ocepechelon Pappigerus Paracryptodira Patagoniaemys Polysternon Pleurosternon Prochelidella Protostega Protostegidae Pneumatoarthrus Sankuchemys Santanachelys Sinemys Terlinguachelys Toxochelys Trionyx kansaiensis Yaminuechelys

Paleogene and Neogene period	Acherontemys Allaeochelys Anosteira Arabemys Argillochelys Aurorachelys Baenidae Berruchelus Carbonemys Carolinochelys Cedrobaena Cerrejonemys Chelodina murrayi Chelydrops Chelydropsis Chisternon Cosmochelys Crossochelys Elseya uberrima Elseya nadibajagu Eochelone Eosphargis Euclastes Gamerabaena Glarichelys Hadrianus Hesperotestudo Hutchemys Itilochelys Kinosternon pojoaque Macrocephalochelys Manchurochelys Meiolania Meiolaniidae Megalochelys Mesodermochelys Mexichelys Miocaretta Niolamia Ninjemys Pacifichelys Palaeotrionyx Palatobaena Parahydraspis Peckemys Planiplastron Plesiobaena Procolpochelys Protochelydra Protosphargis Psephophorus Puppigerus Rheodytes devisi Stupendemys Stylemys Syllomus Warkalania

Recent	Cylindraspis species: Domed Mauritius giant tortoise Domed Rodrigues giant tortoise Réunion giant tortoise Saddle-backed Mauritius giant tortoise Saddle-backed Rodrigues giant tortoise Aldabrachelys abrupta Chelonoidis nigra abingdonii (Lonesome George)

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