On the hybridisation between two distantly related Asian turtles (Testudines: Sacalia × Mauremys) (original) (raw)
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On the hybridisation between two distantly related Asian turtles (Testudines: Sacalia x Mauremys)
2005
This is the first report of a hybridisation between Sacalia and Mauremys (Bataguridae). New data and a review of the literature show that 19 batagurid hybridisations are documented. Many more undoubtedly exist, but have not been documented and reported. Most hybrids are members of the Cuora + Mauremys clade and 17 of 19 reported hybrids have at least one member from this clade. The Sacalia × Mauremys hybridisation reported here is only the third hybridisation between a species of the Cuora + Mauremys clade and a species outside of that clade.
Recent hybrid origin of three rare Chinese turtles
Conservation Genetics, 2007
Three rare geoemydid turtles described from Chinese trade specimens in the early 1990s, Ocadia glyphistoma, O. philippeni, and Sacalia pseudocellata, are suspected to be hybrids because they are known only from their original descriptions and because they have morphologies intermediate between other, better-known species. We cloned the alleles of a bi-parentally inherited nuclear intron from samples of these three species. The two aligned parental alleles of O. glyphistoma, O. philippeni, and S. pseudocellata have 5–11.5 times more heterozygous positions than do 13 other geoemydid species. Phylogenetic analysis shows that the two alleles from each turtle are strongly paraphyletic, but correctly match sequences of other species that were hypothesized from morphology to be their parental species. We conclude that these rare turtles represent recent hybrids rather than valid species. Specifically, “O. glyphistoma” is a hybrid of Mauremys sinensis and M.␣cf. annamensis, “O.␣philippeni” is a hybrid of M. sinensis and Cuora trifasciata, and “S. pseudocellata” is a hybrid of C. trifasciata and S. quadriocellata. Conservation resources are better directed toward finding and protecting populations of other rare Southeast Asian turtles that do represent distinct evolutionary lineages.
Variation in East Asian Turtles of the Genus Mauremys (Bataguridae; Testudines)
Journal of Herpetology, 1994
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Zoological Science, 2002
Phylogenetic relationships of the genus Cuora sensu lato ( Cuora sensu stricto and Cistoclemmys ) and other testudinoid genera were inferred from variations in 882 base positions of mitochondrial 12S and 16S rRNA genes. Results yielded a robust support to the monophyly of a group ( Cuora group) consisting of Cuora sensu lato and the monotypic Pyxidea . Within the Cuora group, the continental Cuora (sensu stricto) and the two subspecies of Ci. flavomarginata constituted two well-supported monophyletic groups. Distinctly small interspecific genetic distances in the former groups suggested that in the continent speciations in Cuora took place much later than the primary divergences in the Cuora group, or speciations in other related genera, such as Mauremys. Our analyses failed to provide a substantial support to the monophyly of any other combinations of taxa within the Cuora group, including Cuora in broad and strict senses, and Cistoclemmys as consisting of Ci. galbinifrons and Ci. flavomarginata . Besides these, our results also suggested the non-monophyly for the Batagurinae and the Geoemydinae, and sister relationships of the Bataguridae with Testudinidae rather than with the Emydidae.
Zoological Science, 2002
Phylogenetic relationships of the genus Cuora sensu lato ( Cuora sensu stricto and Cistoclemmys ) and other testudinoid genera were inferred from variations in 882 base positions of mitochondrial 12S and 16S rRNA genes. Results yielded a robust support to the monophyly of a group ( Cuora group) consisting of Cuora sensu lato and the monotypic Pyxidea . Within the Cuora group, the continental Cuora (sensu stricto) and the two subspecies of Ci. flavomarginata constituted two well-supported monophyletic groups. Distinctly small interspecific genetic distances in the former groups suggested that in the continent speciations in Cuora took place much later than the primary divergences in the Cuora group, or speciations in other related genera, such as Mauremys. Our analyses failed to provide a substantial support to the monophyly of any other combinations of taxa within the Cuora group, including Cuora in broad and strict senses, and Cistoclemmys as consisting of Ci. galbinifrons and Ci. flavomarginata . Besides these, our results also suggested the non-monophyly for the Batagurinae and the Geoemydinae, and sister relationships of the Bataguridae with Testudinidae rather than with the Emydidae.
Molecular systematics of Old World stripe-necked turtles (Testudines: Mauremys)
2004
Nine extant species of Mauremys (including Ocadia and Chinemys) represent a geographically widespread yet morphologically and ecologically conservative group of batagurid turtles. Here we examine the evolutionary relationships of Mauremys using 1539 base pairs of mitochondrial DNA encoding portions of COI, ND4, and three adjacent tRNA genes. These data contain 246 parsimony informative characters that we use to erect hypotheses of relationships for Mauremys. Both maximum parsimony and Bayesian methods suggest that Mauremys japonica, M. sinensis, M. nigricans, and M. reevesii form a well-supported monophyletic clade, as do M. mutica and M. annamensis. Furthermore, our analyses show that M. mutica is paraphyletic with respect to M. annamensis. The western taxa M. leprosa, M. caspica, and M. rivulata remain problematic and do not form a monophyletic group sister to the Asian taxa. Nevertheless, an east-west biogeographic hypothesis cannot be discounted with our molecular genetic data.
PeerJ, 2016
Hybridization among sea turtle species has been widely reported in the Atlantic Ocean, but their detection in the Pacific Ocean is limited to just two individual hybrid turtles, in the northern hemisphere. Herein, we report, for the first time in the southeast Pacific, the presence of a sea turtle hybrid between the green turtle Chelonia mydas and the hawksbill turtle Eretmochelys imbricata. This juvenile sea turtle was captured in northern Peru (4 13′S; 81 10′W) on the 5 th of January, 2014. The individual exhibited morphological characteristics of C. mydas such as dark green coloration, single pair of pre-frontal scales, four post-orbital scales, and mandibular median ridge, while the presence of two claws in each frontal flipper, and elongated snout resembled the features of E. imbricata. In addition to morphological evidence, we confirmed the hybrid status of this animal using genetic analysis of the mitochondrial gene cytochrome oxidase I, which revealed that the hybrid individual resulted from the cross between a female E. imbricata and a male C. mydas. Our report extends the geographical range of occurrence of hybrid sea turtles in the Pacific Ocean, and is a significant observation of interspecific breeding between one of the world's most critically endangered populations of sea turtles, the east Pacific E. imbricata, and a relatively healthy population, the east Pacific C. mydas.