Open Access Open Access  Restricted Access Subscription or Fee Access
Cover Image

A Two-Headed Green Sea Turtle (Chelonia mydas) Hatchling on Samandağ Beach, Turkey

Bektaş Sönmez, Mehmet Sert, Senem Kayıkçı, Özay Bedirci, Şükran Yalçın Özdilek

Abstract


A two headed green sea turtle (Chelonia mydas) was found on Samandağ Beach, Turkey in 2015 nesting season. The two heads were anatomically similar with independent reaction to external stimuli. The carapace scutes showed anomalies. Radiography was performed and the spinal column was seen to bifurcate in the area close to the caudal region. In the post mortem examination, esophagus, stomach, liver, lung, heart and trachea were duplicated. The two headed green turtle was subclassified as teratodidymus. Dicephalism rarely occurs in sea turtle and perhaps genetic factors may play a significant role for this two headed green sea turtle.

Keywords


dicephalism; anatomy; green turtle; morphology

Full Text:

PDF

References


Barbour E. H. (1896), «A Two-Headed Tortoise», Science New Ser., 4(84), 159 – 160.

Bishop C. A., Pettit Ng. P. K. E., Kennedy S. W., Stegeman J. J., Norstrom R. J., and Brooks R. J. (1998), «Environmental contamination and developmental abnormalities in eggs and hatchlings of the common snapping turtle (Chelydra serpentina serpentina) from the Great Lake-St. Lawrence River basin (1989 – 91)», Environm. Poll., 101, 143 – 156.

Bolten A. B. (1999), «Techniques for measuring sea turtles», in: K. L. Eckert, K. A. Bjorndal, F. A. Abreu-Grobois, and M. Donnelly (eds.), Research and Management Techniques for the Conservation of Sea Turtles, IUCN/MTSG, Publication 4, pp. l10 – 115.

Buffetaut E., Li J., Tong H., and Zhang H. (2007), «A two-headed reptile from the Cretaceous of China», Biol. Lett., 3, 80 – 81.

Frye F. L. (1991), «Developmental abnormalities», in: F. L. Frye (ed.), Biomedical and Surgery Aspects of Captive Reptile Husbandry. 2nd Edition, Krieger Publ. Co., Malabar, pp. 393 – 419.

Fowler L. E. (1979), «Hatching success and nest predation in the green sea turtle, Chelonia mydas, at Tortuguero, Costa Rica», Ecology, 60(5), 946 – 955.

Girling S. and Raiti P. (2004), «Breeding and neonatal care», in: S. Girling and P. Raiti (eds.), BSAVA Manual of Reptiles. 2nd Edition, British Small Animal Veterinary Association, Gloucester, pp. 43 – 44.

Heasman W. J. (1933), «The anatomy of a double-headed snake», J. Anat., 67(2), 331 – 345.

Hildebrand S. F. (1930), «Duplicity and other abnormalities in diamond-black terrapins», Elisha Mitchell Sci. Soc., 46, 41 – 53.

Jackson O. F. and Fasal M. D. (1981), «Radiology in tortoises, terrapins and turtles as an aid to diagnosis», J. Small Anim. Pract., 22, 705 – 716.

Kim II-H., Kim Ja-K., Fong J. J., and Park D. (2013), «Report of a dicephalic steppes ratsnake (Elaphe dione) collected in South Korea», Asian Herpetol. Res., 4(3), 182 – 186.

Nakamura K. (1938), «Studies on some specimens of double monsters of snakes and tortoises», Mem. College Sci. Kyoto Imp. Univ. Ser. B, 14, 171 – 192.

Newman H. H. (1917), The Biology of Twins (Mammals), University of Chicago Press, Chicago, pp. 120 – 180.

Oros J., Rodriguez J. L., Monteros A. E., Rodriguez F., Herraez P., and Fernandez A. (1997), «Tracheal malformation in a bicephalic honduran milk snake (Lampropeltis hondurensis) and subsequent fatal Salmonella arizonae infection», J. Zoo Wildlife Med., 28(3), 331 – 335.

Palmieri C., Selleri P., Girolamo N. D., Montani A., and Salda L. D. (2013), «Multiple congenital malformations in a dicephalic spur-thighed tortoise (Testudo graeca ibera)», J. Comp. Pathol., 149, 368 – 371.

Peters A., Verhoeven K. J. F., and Strijbosch H. (1994), «Hatching and emergence in the Turkish Mediterranean loggerhead turtle, Caretta caretta: Natural causes for egg and hatchling failure», Herpetologica, 50(3), 369 – 373.

Rothschild B. M., Schultze H. P., and Pellegrini R. (2012), «Summary of osseous pathology in amphibians and reptiles», in: B. M. Rothschild, H. P. Schultze and R. Pellegrini (eds.), Herpetological Osteopathology: Annotated Bibliography of Amphibians and Reptiles, Springer, New York, pp. 28 – 37.

Sailer A., Pyczak C., and Hartman U. K. (1997), «Siamese twins of Testudo hermanni boettgeri», Herpetofauna, 19, 12 – 13.

Sönmez B., Turan C., and Yalçın Özdilek Ş. (2011), «The effect of relocation on the morphology of green turtle, Chelonia mydas (Linnaeus, 1758), hatchlings on Samandağ beach, Turkey», Zool. Middle East, 52, 29 – 38.

Sönmez B. and Yalçın Özdilek Ş. (2011), «Morphologic characters of albino green turtle (Chelonia mydas) hatchlings on Samandağ beach in Turkey», Marine Turtle Newslett., 131, 48.

Stockard C. R. (1921), «Developmental rate and structural expression: an experimental study of twins, double monsters and single deformities, and the interactions among embryonic organs during their origin and development», Am. J. Anat., 28, 115 – 277.

Stojanov C. (2000), «Hornpanzerananomalien bei den Landschildkröten (Testudo graeca ibera and Testudo hermanni boettgeri)», Hist. Nat. Bulgar., 11, 97 – 105.

Suedmeyer W. K. (1995), «Noninfectious diseases of reptiles», Sem. Avian Exotic Pet Med., 4, 56 – 60.

Velo-Anton G., Becker C. G., and Cordero-Rivera A. (2011), «Turtle carapace anomalies: the roles of genetic diversity and environment», PLoS ONE, 6(4), e18714.

Wallach V. (2007). «Axial bifurcation and duplication in snakes, Part I, A synopsis of authentic and anecdotal cases», Bull. Md. Herpetol. Soc., 43, 57 – 95.


Refbacks

  • There are currently no refbacks.