. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 17. Vent'al (AMS 21434). view of the skull of C. parkeri Hatching under natural conditions appears to occur at a carapace length of about 35 mm. A recent hatchling caught by Parker at Sigabaduru on January 17 measured 36 mm, while another from Balumuk, caught on February 19, measured 37 mm. C. siebenrocki apparently occurs sympat- rically with CJwlodina novaeguineae, Emy- dura subglobosa and Elseya novaeguineae, and possibly Carettochelys insculpta and Pelochelys bibroni. DISCUSSION Nomenclature. The major nome


. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 17. Vent'al (AMS 21434). view of the skull of C. parkeri Hatching under natural conditions appears to occur at a carapace length of about 35 mm. A recent hatchling caught by Parker at Sigabaduru on January 17 measured 36 mm, while another from Balumuk, caught on February 19, measured 37 mm. C. siebenrocki apparently occurs sympat- rically with CJwlodina novaeguineae, Emy- dura subglobosa and Elseya novaeguineae, and possibly Carettochelys insculpta and Pelochelys bibroni. DISCUSSION Nomenclature. The major nomenclatorial problem involving C. siebenrocki has re- sulted from the belief that Chelodina ob- longa, a distinct species endemic to southwestern Australia, extends as far north as northern Australia and islands south of New Guinea. Gray (1844) referred a spec- imen from Port Essington (Darwin) in the Northern Territory of Australia to C. ob- longa, while Strauch (1890) and Schenkel (1901) added to the confusion by reporting C. oblonga from Prince of Wales Island and Thursday Island, both in the Torres Strait near the northern Australian coast. These three localities are all within the range of C. rugosa. Finally, Siebenrock. Figure 18. Lateral view of the skull of C. parkeri (AMS 21434). (1905) referred five embryos of C. sieben- rocki from Saibai Island near the coast of New Guinea to C. oblonga. Most later authors (Werner, 1909; Siebenrock, 1909; DeRooij, 1915; Loveridge, 1948; Mertens and Wermuth, 1955; Wermuth and Mertens, 1961; Mehrtens, 1967) recognized C. sieben- rocki as a distinct species from mainland New Guinea, but followed the error of earlier authors by citing C. oblonga from northern Australia and islands in the Torres Strait. Siebenrock (1915) synonymized C. sie- benrocki with C. oblonga, after already having synonymized C. rugosa with C. ob- longa''in 1909. Goode (1967) considers C. rugosa of northern Australia and C. siebenrocki of New Guinea to be conspecific


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