Ocadia

Ocadia
Chinese stripe-necked turtle
Ocadia sinensis
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Reptilia
Order:Testudines
Suborder:Cryptodira
Family:Geoemydidae
Subfamily:Geoemydinae
Genus:Ocadia
Gray, 1870

Ocadia is a genus of turtles in the family Geoemydidae (formerly called Bataguridae). It is sometimes included in Mauremys.[1] It contains the following species:

O. sinensis is known to hybridize with most other Geoemydidae genera.[2] Hybridization runs rampant in that family; while it is possible that perfectly valid species could arise this way, the other Ocadia species are apparently only known from a few specimens each, all of them purchased from a turtle dealer in Hong Kong:

The supposed species "Ocadia glyphistoma", described by Mccord & Iverson in 1994 and supposedly from southern Guangxi and northern Vietnam, is a hybrid between a male O. sinensis and a female Vietnamese pond turtle (Mauremys annamensis).[3] This "species" seems to be naturally occurring in central Vietnam, but is occasionally also bred for the pet trade in southern Chinese turtle farms.[4]

Philippen's striped turtle ("Ocadia philippeni"), described by Mccord & Iverson in 1992 and said to occur on Hainan, also proved to be a hybrid, between a male O. sinensis and a female Cuora trifasciata.[5] It is not proven but likely that this "species" also originates from both the wild and is bred in farms.

In 2013, a Miocene Japanese fossil species of the same genus was described, Ocadia tanegashimensis Takahashi & al.,[6] which adds itself to the already known Pleistocene O. nipponica, from the same country.

References

  1. ↑ Honad et al. (2002), Feldman & Parham (2004), Spinks et al. (2004)
  2. ↑ see Vetter & Van Dijk (2006)
  3. ↑ Spinks et al. (2004), Stuart & Parham (2006)
  4. ↑ Blanck et al. (in prep.)
  5. ↑ Stuart & Parham (2006)
  6. ↑ Akio Takahashi, Kimihiko Ōki, Takahiro Ishido, & Ren Hirayama, 2013, "A new species of the genus Ocadia (Testudines: Geoemydidae) from the middle Miocene of Tanegashima Island, southwestern Japan and its paleogeographic implications"
  • Conserv Genet (2007) 8:169–175
  • Buskirk, James R.; Parham, James F. & Feldman, Chris R. (2005): On the hybridisation between two distantly related Asian turtles (Testudines: Sacalia × Mauremys). Salamandra 41: 21-26. PDF fulltext
  • Parham, James Ford; Simison, W. Brian; Kozak, Kenneth H.; Feldman, Chris R. & Shi, Haitao (2001): New Chinese turtles: endangered or invalid? A reassessment of two species using mitochondrial DNA, allozyme electrophoresis and known-locality specimens. Animal Conservation 4(4): 357–367. HTML abstract Erratum: Animal Conservation 5(1): 86 HTML abstract
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