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Chelodina parkeri RHODIN & MITTERMEIER, 1976

IUCN Red List - Chelodina parkeri - Vulnerable, VU

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Higher TaxaChelidae, Chelodininae, Pleurodira, Testudines (turtles)
Subspecies 
Common NamesE: Parker’s Snake-necked Turtle 
SynonymChelodina parkeri RHODIN & MITTERMEIER 1976
Chelodina parkeri — FRITZ & JAUCH 1989
Macrochelodina parkeri — IVERSON et al. 2001
Macrochelodina parkeri — FRITZ & HAVAS 2007
Chelodina (Macrochelodina) parkeri — GEORGES & THOMSON 2010
Chelodina (Macrochelodina) parkeri — TTWG 2014
Chelodina (Chelydera) parkeri — SHEA et al. 2020
Chelodina parkeri — TTWG 2021 
DistributionNew Guinea (Lakes Murray and Balimo, Fly and Aramia rivers, Western District's savannah regions north of the Fly River)

Type locality: Mawa, Lake Murray, Western District, Papua New Guinea.  
Reproductionoviparous. 
TypesHolotype: AMS 21425 
DiagnosisDiagnosis (subgenus Chelydera): Large riverine turtles; carapace broadly oval with noticeable flaring about marginal scutes 8–10; plastron narrow, covering only about half of the anterior orifice of the shell in ventral view; plastron of moderate length, approximately twice as long as its width measured anterior to the bridge; head and neck longer than carapace; intergular scute rhomboid in shape with width approximately equal to length. Neck dorsum finely reticulated, lacking obvious tubercles. Osteologically, atlas (C1) elongated; cervical vertebrae 2–4 greatly elongated (centrum about three times as long as wide); transverse processes of cervical vertebrae thickened, not bladelike as in subgenera Chelodina and Macrochelodina. Skull dorsoventrally flattened, in some species also laterally expanded, resulting in antero-posterior enlargement of palatines. Hyolaryngeal assemblage highly modified; extreme elongation of corpus hyoideum along sulcus tracheae; anterior cornubranchiale expanded, elongated, extending beyond posterior cornubranchiale; epibranchials fully ossified in adults, cartilaginous throughout life in species of the other subgenera. Anterior bridge struts enlarged; suture with pleural 1 extends half-way across pleural; proximal suture of strut enlarged and also contacts 2nd pleural in very large specimens; posterior bridge strut enlarged and thickened, but does not contact pleurals; ilium sutures with 8th pleural and pygal and is latero-posteriorly rotated. Exposed neural bones usually absent (except for Chelodina burrungandjii, typically with 3–6 exposed neurals; Smales 2019). Fluid from ducts in the inguinal and axillary pockets with noticeable odour, but not pungent (Shea et al. 2020: 430). 
CommentHabitat: freshwater (rivers, swamps)

Type Species: Chelodina parkeri Rhodin & Mittermeier 1976 is the type species of the subgenus Chelydera Thomson and Georges in Shea et al. 2020. 
EtymologyNamed after Fred Parker, Indian-born Australian herpetologist.

The name Chelydera is a combination of the Greek χέλυς/χέλυδρος (chelys/chelydros), meaning both a turtle (cf. the similarly snake-necked turtle genus Chelus Duméril 1806) and a water snake, and δειρή (deire), the neck (f.) (Liddell & Scott 1897; Brown 1956). This is in reference to the common name for this group, the snake-necked turtles. Shea et al. 2020 use a feminine name for the subgenus to agree with Chelodina, to avoid a change in gender of any adjectival specific epithets if Chelydera is treated as generically distinct by some authors. 
References
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Bonin, F., Devaux, B. & Dupré, A. 2006. Turtles of the World. English translation by P.C.H. Pritchard. Johns Hopkins University Press, 416 pp.
  • Bour, R. 2008. Global diversity of turtles (Chelonii; Reptilia) in freshwater. Hydrobiologia 595:593–598 - get paper here
  • Ernst,C.H. and Barbour,R.W. 1989. Turtles of the World. Smithsonian Institution Press, Washington D.C. - London
  • Fritz, U. & D. Jauch 1989. Haltung, Balzverhalten und Nachzucht von Parkers Schlangenhalsschildkröte Chelodina parkeri RHODIN & MITTERMEIER, 1976 (Testudines: Chelidae). Salamandra 25 (1): 1-13 - 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
  • Georges, Arthur, Carla Eisemberg, Yolarnie Amepou and Eric Manasi. 2014. Turtle conservation challenges in papua New Guinea. Turtle Survival 2014: 22-24 - get paper here
  • Hennig, Andreas S. 2012. Aquaterrarien für Wasserschildkröten. Terraria-Elaphe 2012 (1): 14-19 - get paper here
  • Kunz, K. 2012. Bild schön! Fotografie von Terrarientieren. Reptilia (Münster) 17 (94): 20-26 - get paper here
  • Rhodin,A.G.J. & Mittermeier,R.A. 1976. Chelodina parkeri, a new species of chelid turtle from New Guinea, with a discussion of Chelodina siebenrocki Werner 1901. Bull. Mus. Comp. Zool. Harvard 147 (11): 465-488 - 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
  • 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
 
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