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Chelodina burrungandjii THOMSON, KENNETT & GEORGES, 2000

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Higher TaxaChelidae, Chelodininae, Pleurodira, Testudines (turtles)
Common NamesE: Arnhem Land Long-Necked turtle
E: Kimberley Snake-necked Turtle [walloyarrina] 
SynonymChelodina burrungandjii THOMSON, KENNETT & GEORGES 2000
Macrochelodina burrungandjii — ARTNER 2003
Macrochelodina burrungandjii — FRITZ & HAVAS 2007
Chelodina (Macrochelodina) burrungandjii — GEORGES & THOMSON 2010
Chelodina (Macrochelodina) burrungandjii — TTWG 2014
Chelodina burrungandjii — KEHLMAIER et al. 2019
Chelodina (Chelydera) burrungandjii — SHEA et al. 2020
Chelodina burrungandjii burrungandjii — SHEA et al. 2020 (by implication)
Chelodina burrungandjii — TTWG 2021 
DistributionN Australia (Arnhem Land)

Type locality: Koolpin Gorge, South Alligator River (13° 28’ S, 132° 38’ E).  
TypesHolotype: NTM 16010 
DiagnosisDiagnosis (walloyarrina): The following differentiates Macrochelodina walloyarrina sp. nov. from its morphologically closest congener M. burrungandjiiand its biogeographically closest congeners M. rugosa (allopatric) and M. kuchlingi(sympatric). Of the characters given in the foregoing description, only those that help differentiate M. walloyarrinafrom M. burrungandjii, M. rugosa, and M. kuchlingiare given here. Head. Macrochelodina walloyarrinahas a high HW to HL ratio (0.74) for the M. rugosa complex (average 0.71); the same ratios are present in eastern (Cape York and New Guinea) M. rugosa (0.74); lower ratios (narrower and/or longer head) are present in western (Darwin and Daley River) M. rugosa(0.69), and M. kuchlingi (0.63); and the highest ratio (widest and/or shortest head) is present in M. burrungandjii (0.76). The head robusticity (HW x HD/HL) of M. walloyarrinais 5% less than that of M. burrungandjii, 9% less than that of (average) M. rugosa, and 6% more than that of M. kuchlingi. The parietal roof of M. walloyarrina is 11% narrower (in relation to head width) than that of M. burrungandjii and that of M. rugosa, and 20% narrower than that of M. kuchlingi. M. walloyarrina has three to four pairs of barbels with the most medial one or two pairs being notably long (hence the common name “bearded longneck”), and although M. burrungandjii may also have three to four pairs of barbels, usually only the more medial pair will be as much as intermediate in length. M. rugosa and M. kuchlingi usually have only one pair of small medial barbels, with one or two pairs of light colored tubercles behind the barbels. The interorbital width relative to head width of M. walloyarrina equals that of M. burrungandjii, but is 7% less than that of M. rugosa, and 13% less than that of M. kuchlingi. The iris of M. walloyarrina varies in color from olive or green to orange or rust with an inner white to gold ring, whereas the iris of M. burrungandjii is chocolate or rust-colored with a light gold inner ring, and the iris of M. rugosa (M. kuchlingi unknown) is yellow to gold with a black perimeter and a thin white to light-yellow inner ring. Dorsal head color of both M. walloyarrina and M. burrungandjii varies from olive green to black, whereas that of M. rugosaand M. kuchlingi is usually black, occasionally brown. The tympana in M. walloyarrina and M. burrungandjii are usually white with olive green mottling, whereas in M. rugosa and M. kuchlingi the tympana are white with black mottling. 
CommentHabitat: freshwater (rivers, swamps)

Synonymy: Chelodina walloyarrina was not listed by COGGER 2014 and probably considered as a synonym of Chelodina burrungandjii by him but more recently considered as a valid species. 
EtymologyThe name walloyarrina is a combination of two Australian aboriginal words — wallo meaning “chin,” and yarrin meaning “bearded” — in accord with the common name “bearded longneck turtle” often given to the longnecks of the Kimberley (because of their long barbels). 
  • Bour, R. 2008. Global diversity of turtles (Chelonii; Reptilia) in freshwater. Hydrobiologia 595:593–598 - get paper here
  • Cogger, H. G. 2014. Reptiles and Amphibians of Australia, 7th ed. CSIRO Publishing, xxx + 1033 pp. - get paper here
  • DOODY, J. SEAN; RICHARD VOGT, SIMON CLULOW & DAVID RHIND. 2021. CHELODINA WALLOYARRINA (Kimberley Sandstone Longneck Turtle). BEHAVIOR. Herpetological Review 52 (2): 386–387. - get paper here
  • Ellis, Ryan J. and Arthur Georges 2015. An annotated type catalogue of the turtles (Testudines: Pleurodira: Chelidae) in the collection of the Western Australian Museum. Rec. West. Aust. Mus. 30: 52-60, DOI: 10.18195/issn.0312-3162.30(1).2015.052-060 - get paper here
  • Fritz, U. & Havas, P. 2007. CHECKLIST OF CHELONIANS OF THE WORLD. Vertebrate Zoology 57(2): 149-368 - get paper here
  • Georges, A. & Thomson, S. 2010. Diversity of Australasian freshwater turtles, with an annotated synonymy and keys to species. Zootaxa 2496: 1–37 - get paper here
  • Kehlmaier, C., Zhang, X., Georges, A., Campbell, P. D., Thomson, S., & Fritz, U. 2019. Mitogenomics of historical type specimens of Australasian turtles: clarification of taxonomic confusion and old mitochondrial introgression. Scientific Reports, 9(1): 5841 - get paper here
  • Maier, C R & Sonneman, T 2018. Chelodina burrungandjii (Sandstone Snake-necked Turtle) Maximum size. Herpetological Review 49 (3): 521-522 - get paper here
  • McCord, W. P., and M. Joseph-Ouni. 2007. A New Genus of Australian Longneck Turtle (Testudines: Chelidae) and a New Species of Macrochelodina from the Kimberley Region of Western Australia (Australia). Reptilia (GB) (53): 56-64 - get paper here
  • SHEA, GLENN; SCOTT THOMSON & ARTHUR GEORGES 2020. The identity of Chelodina oblonga Gray 1841 (Testudines: Chelidae) reassessed. Zootaxa 4779 (3): 419–437 - get paper here
  • Thomson,S., Kennett, R. & Georges,A. 2000. A new species of long-necked turtle (Chelidae: Chelodina) from the sandstone plateau of Arnhem Land, Northern Australia. Chelonian Conserv. Biol. 3: 675-685
  • TTWG [Peter Paul van Dijk, John B. Iverson, Anders G.J. Rhodin, H. Bradley Shaffer, and Roger Bour] 2014. Turtles of the World, 7th Edition: Annotated Checklist of Taxonomy, Synonymy, Distribution with Maps, and Conservation Status. 000.v7. Chelonian Research Monographs (ISSN 1088-7105) No. 5, doi:10.3854/crm.5.000.checklist.v7.2014 - get paper here
  • TTWG; Rhodin, A.G.J., Iverson, J.B., Bour, R., Fritz, U., Georges, A., Shaffer, H.B., and van Dijk, P.P. 2021. Turtles of the World: Annotated Checklist and Atlas of Taxonomy, Synonymy, Distribution, and Conservation Status (9th Ed.). In: Rhodin, A.G.J., Iverson, J.B., van Dijk, P.P., Stanford, C.B., Goode, E.V., Buhlmann, K.A., and Mittermeier, R.A. (Eds.). Chelonian Research Monographs 8:1–472. doi:10.3854/crm.8.checklist.atlas.v9.2021. - get paper here
  • Valverde, J. 2010. Schlangenhalsschildkröten. Reptilia (Münster) 15 (85): 16-23 [erratum in 86: 10] - get paper here
  • Wilson, S. & Swan, G. 2010. A complete guide to reptiles of Australia, 3rd ed. Chatswood: New Holland, 558 pp.
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