Deirochelys

Deirochelys
Temporal range: Miocene - Recent
Chicken turtle (D. reticularia) basking
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Suborder: Cryptodira
Superfamily: Testudinoidea
Family: Emydidae
Subfamily: Deirochelyinae
Genus: Deirochelys
Agassiz, 1857
Type species
Deirochelys reticularia
Latreille, 1801
Species[1]
Synonyms[2]
  • Dirochelys Baur, 1890 (ex errore)
  • Dierochelys Löding, 1922 (ex errore)

Deirochelys is a genus of freshwater turtle in the family Emydidae, the pond and marsh turtles. It contains one extant species, the chicken turtle (Deirochelys reticularia), which is native to the southeastern United States. A second extinct member, Deirochelys carri, is known from a fossil found in Alachua County, Florida.[3] The genus was first described by Louis Agassiz in 1857,[4] and its name is derived from the Ancient Greek words for "neck" (deirḗ) and "tortoise" (khélūs), referring to the particularly long necks of these turtles.[5]

Evolution

Like other emydids (members of the family Emydidae), Deirochelys' karyotype consists of 2N=50 chromosomes.[6] A 1996 study of various turtles' mitochondrial DNA supported the partition of Emydidae into two subfamilies, Emydinae and Deirochelyinae, with Deirochelys placed within the latter. Deirochelys was reported to be the sister genus to the rest of the subfamily, meaning it shares a common ancestor with the ancestor of all the other genera in Deirochelyinae.[7] Alternative analysis by Stephens and Wiens found that under certain analyses Deirochelys could instead be described as a sister taxon to Emydinae or indeed to the family Emydidae itself. The authors attributed this confusion to long-branch attraction and concluded that Deirochelys did indeed sit within Deirochelyinae.[8] Spinks et al. (2009) also found Deirochelys to be a sister to Emydidae under maximum parsimony.[9]

It has been proposed that Deirochelys and the painted turtles Chrysemys are among the most ancient emydids, having diverged from the rest of the emydids more than 24.4 million years ago. The genus Deirochelys itself is thought to have evolved before the end of the Clarendonian, over 10.3 million years ago.[10]

Bickham, et al. 1996
Emydidae
Spinks, et al. 2009
Testudinoidea

Species

There are two currently accepted species:

A possible third species, D. floridana, was described by Oliver Perry Hay in 1908 from a fossil specimen. In 1964, C.G. Jackson determined the specimen to instead be D. reticularia, but in 1974 he reassigned it to the genus Chrysemys. Jasinski (2018) reasserted that this turtle did indeed represent a separate species of Deirochelys.[10]

References

  1. ^ "Deirochelys". Mindat.org. Retrieved 2022-05-12.
  2. ^ Fritz, Uwe; Havaš, Peter (2007). "Checklist of Chelonians of the World" (PDF). Vertebrate Zoology. 57 (2): 179–180. doi:10.3897/vz.57.e30895. Retrieved 2022-05-15.
  3. ^ Jackson, Dale R. (1978). "Evolution and fossil record of the chicken turtle Deirochelys, with a re-evaluation of the genus". Tulane Studies in Zoology and Botany. 20. New Orleans, Louisiana: Tulane University: 43. Retrieved 2022-05-15.
  4. ^ Agassiz, Louis (1857). Contributions to the natural history of the United States of America. Vol. 1. Boston, Massachusetts: Little, Brown and Company. doi:10.5962/bhl.title.12644. Retrieved 2022-05-15.
  5. ^ "Taxonomy chapter for Turtle, eastern chicken (030064)". BOVA booklet. Virginia Fish and Wildlife Information Service. Retrieved 2022-04-24.
  6. ^ Killebrew, Flavius C. (1977). "Mitotic chromosomes of turtles. IV. The Emydidae". Texas Journal of Science. 29 (3/4). Texas Academy of Science: 245–254. Retrieved 2022-04-25.
  7. ^ Bickham, John W.; Lamb, Trip; Minx, Patrick; Patton, John C. (1996). "Molecular systematics of the genus Clemmys and the intergeneric relationships of emydid turtles". Herpetologica. 52 (1): 89–97. JSTOR 3892960.
  8. ^ Stephens, Patrick R.; Wiens, John J. (2003). "Ecological diversification and phylogeny of emydid turtles". Biological Journal of the Linnean Society. 79 (4): 577–610. doi:10.1046/j.1095-8312.2003.00211.x.
  9. ^ Spinks, Phillip Q.; Thomson, Robert C.; Lovely, Geoff A.; Shaffer, H. Bradley (2009). "Assessing what is needed to resolve a molecular phylogeny: simulations and empirical data from emydid turtles" (PDF). BMC Evolutionary Biology. 9 (1): 56. Bibcode:2009BMCEE...9...56S. doi:10.1186/1471-2148-9-56. PMC 2660309. PMID 19284630.
  10. ^ a b Jasinski, Stephen E. (2018). "A new slider turtle (Testudines: Emydidae: Deirochelyinae: Trachemys) from the late Hemphillian (late Miocene/early Pliocene) of eastern Tennessee and the evolution of the deirochelyines". PeerJ. 6: e4338. doi:10.7717/peerj.4338. PMC 5815335. PMID 29456887.

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