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Denazinemys Temporal range: Late Cretaceous, 74.56–73.04 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Pantestudines
Clade:	Testudinata
Clade:	†Paracryptodira
Family:	†Baenidae
Clade:	†Baenodda
Genus:	†Denazinemys Lucas and Sullivan, 2006
Species
D. nodosa (Gilmore, 1916)
Synonyms
"Baena" nodosa Gilmore, 1916

Denazinemys was a genus of baenid turtle that lived in the Late Cretaceous of New Mexico. The holotype specimen, which D. nodosa was based on, USNM 8345, consists of a partial carapace and plastron. It came from the De-na-zin Member of the Kirtland Formation, and therefore, Denazinemys lived in the Kirtlandian land-vertebrate age. Many specimens other than the holotype have been assigned to Denazinemys.

Numerous shell fragments from the Lower and the Middle Campanian were assigned to Denazinemys nodosa, based on the welted structure of the shell surface. However, a recent study calls into question the attribution of this material to Denazinemys nodosa, as the material is too fragmentary to distinguish differences in the structure of the welted shell surface. As it is not yet possible to identify these fragments precisely (several species of baenidae having this same feature on their shell surface), the researchers restricted Denazinemys nodosa to the Upper Campanian.

Distinguishing characteristics

Previously, Scabremys ornata was assigned to Denazinemys as D. ornata. Below are the features found in Denazinemys distinguishing the two genera:

• a carapace that is sub-triangular with widest dimension posteriorly;
• prepleurals present and touching the first vertebrae medially;
• the first vertebrae an irregular hexagonal shape with the greatest width posteriorly, contacting anterior second vertebrae;
• extracervicals lateral to the primary cervicals, the cervicals being sub-divided;
• and carapace nodes irregular and not forming distinct ridges.

Classification

Denazinemys is a baenid along with Plesiobaena, Boremys, Scabremys, Baena and Chisternon.

Below is a cladogram made by Sullivan et al. in 2013 showing the relations of Denazinemys: (note: Boremys pulchra is partly a junior synonym of Boremys grandis)

References

1. ^ Sullivan, R.M.; Jasinski, S.E.; Lucas, S.G. (2013). "Re-Assessment of Late Campanian (Kirtlandian) Turtles from the Upper Cretaceous Fruitland and Kirtland Formations, San Juan Basin, New Mexico, USA" (PDF). In Brinkman, D.B.; et al. (eds.). Morphology and Evolution of Turtles. Vertebrate Paleobiology and Paleoanthropology. pp. 337–339. doi:10.1007/978-94-007-4309-0_20. ISBN 978-94-007-4308-3. Archived from the original (PDF) on 2014-02-28. Retrieved 2014-02-19.
2. ^ Spicher, G.E.; Sertich, J.J.; Girard, L.C.; Joyce, W.G.; Lyson, T.R.; Rollot, Y. (2023). "A description of a Denazinemys nodosa specimen (Testudinata, Baenidae) from the Late Cretaceous Kaiparowits Formation of southern Utah". Fossil Record. 26 (2): 151–170. Bibcode:2023FossR..26..151S. doi:10.3897/fr.26.102520.

v t e Pantestudines
Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Diapsida Clade: Sauria Clade: Archelosauria Sauropsida see Sauropsida Pantestudines see below↓ Pantestudines
Pantestudines †Eorhynchochelys †Eunotosaurus? †Odontochelys †Pappochelys Testudinata †Chinlechelys †Condorchelys †Eileanchelys †Heckerochelys †Indochelys †Kallokibotion †Kayentachelys †Proganochelys †Proterochersis †Spoochelys †Australochelyidae Australochelys Palaeochersis Waluchelys †Meiolaniformes Chubutemys Otwayemys Patagoniaemys Peligrochelys Trapalcochelys Meiolaniidae Gaffneylania Meiolania Ninjemys Niolamia Warkalania †Sichuanchelyidae Laurasichersis Mongolochelys Sichuanchelys †Helochelydridae Aragochersis Helochelydra Helochelys Naomichelys Solemys †Compsemydidae Berruchelus Calissounemys Compsemys Kallokibotion? Peltochelys Riodevemys? Selenemys? Tongemys †Paracryptodira Compsemydidae? Helochelydridae? Pleurosternidae Dinochelys Dorsetochelys Glyptops Pleurosternon Riodevemys? Selenemys? Toremys Uluops Baenidae Arundelemys Arvinachelys Baena Boremys Cedrobaena Chisternon Denazinemys Edowa Eubaena Gamerabaena Gehennachelys Goleremys Hayemys Lakotemys Neurankylus Palatobaena Peckemys Plesiobaena Protobaena Saxochelys Scabremys Stygiochelys Thescelus Trinitichelys †Xinjiangchelyidae Annemys Brodiechelys Camerochelys Chengyuchelys Jastmelchyi Kalasinemys Larachelus Phunoichelys Protoxinjiangchelys Shartegemys Siamochelys Tienfuchelys Undjulemys Xinjiangchelys Yanduchelys †Sinemydidae / Macrobaenidae Anatolemys Appalachemys Asiachelys Aurorachelys Changmachelys Dracochelys Gallica Galvechelone Hongkongochelys Hoyasemys Jeholochelys Judithemys Kirgizemys Liaochelys Macrobaena Manchurochelys Ordosemys Osteopygis Oxemys Sinemys Tienfucheloides Wuguia Xiaochelys Yakemys Yumenemys †Thalassochelydia (sensu Joyce et al., 2021) Aplax Cyrtura Euryaspis Hispaniachelys Neusticemys Owadowia Pelobatochelys Thalassemys Protostegidae? "Eurysternidae" Achelonia Chelonides Eurysternum Hydropelta Idiochelys Palaeomedusa Parachelys "Plesiochelyidae" Craspedochelys Globochelus Hylaeochelys? Jurassichelon? Plesiochelys Portlandemys Tropidemys Sandownidae Angolachelys Brachyopsemys Leyvachelys Sandownia Solnhofia? Testudines see Testudines
See also: Angolachelonia Ankylopoda Mesochelydia Perichelydia Category

• Baenidae
• Late Cretaceous turtles of North America
• Kaiparowits Formation
• Fossil taxa described in 2006