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Chelodina burrungandjii THOMSON, KENNETT & GEORGES, 2000

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Higher TaxaChelidae, Chelodininae, Testudines (turtles) 
Subspecies 
Common NamesArnhem Land Long-Necked turtle 
SynonymChelodina burrungandjii THOMSON, KENNETT & GEORGES 2000
Macrochelodina burrungandjii — ARTNER 2003
Macrochelodina burrungandjii — FRITZ & HAVAS 2007
Macrochelodina walloyarrina MCCORD & JOSEPH-OUNI 2007
Chelodina (Macrochelodina) burrungandjii — GEORGES & THOMSON 2010
Macrochelodina wallyarrina — VALVERDE 2010 (in error) 
DistributionN Australia (Arnhem Land)

Type locality: Koolpin Gorge, South Alligator River (13° 28’ S, 132° 38’ E).

walloyarrina: Australia (Western Australia); Type locality: The Fitzroy River at Fitzroy River Crossing, Western Australia, Australia, 18° 10.834’ S and 125° 35.849’ E.; Holotype: Western Australia Museum (WAM) #R164345, an adult male (224 mm carapace length), preserved in alcohol, collected by Dion Wedd, Glen Erikson, Jack Cover, and John Seyjagat in the Fitzroy River, on 20 July 2004. Map legend:
Type locality - Type locality.
 
TypesHolotype: NTM 16010 
CommentSynonymy after GEORGES & THOMSON 2010.

Diagnosis (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. rugosacomplex (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. walloyarrinais 11% narrower (in relation to head width) than that of M. burrungandjiiand that of M. rugosa, and 20% narrower than that of M. kuchlingi. M. walloyarrinahas 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. burrungandjiimay also have three to four pairs of barbels, usually only the more medial pair will be as much as intermediate in length. M. rugosaand M. kuchlingiusually have only one pair of small medial barbels, with one or twopairs of light colored tubercles behind the barbels. The interorbital width relative to head width of M. walloyarrinaequals 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. walloyarrinavaries 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. kuchlingiunknown) is yellow to gold with a black perimeter and a thin white to light-yellow inner ring. Dorsal head color of both M. walloyarrinaand M. burrungandjiivaries from olive green to black, whereas that of M. rugosaand M. kuchlingiis usually black, occasionally brown. The tympana in M. walloyarrinaand M. burrungandjiiare usually white with olive green mottling, whereas in M. rugosaand M. kuchlingithe tympana are white with black mottling.

Reproduction: oviparous. 
EtymologyEtymology (walloyarrina): The species 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). 
References
  • 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
  • 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
  • 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
  • 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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