Gaffney, Eugene S.2005-10-062005-10-061977http://hdl.handle.net/2246/201828 p. : ill. ; 26 cm.Includes bibliographical references (p. 24-28)."The South American and Australian side-necked turtles of the family Chelidae are analyzed using the shared derived character technique of Hennig. The following hypotheses of monophyly are tested using the characters indicated ... : Group 1. Family Chelidae (Pseudemydura, Emydura, Elseya, Platemys, Phrynops, Chelus, Chelodina, Hydromedusa) a. Unusually developed lateral cheek emargination. b. Loss of quadratojugal. c. Loss of mesoplastra. Group 2. Subfamily Chelinae (Emydura, Elseya, Platemys, Phrynops, Chelus, Chelodina, Hydromedusa) a. Anterior frontal process at least partially separating nasals. Group 3. Intrafamily Chelodd (Platemys, Phrynops, Chelus, Chelodina, Hydromedusa) a. Symphyseal suture separating lower jaw rami. b. Dorsal processes of exoccipitals meet medially above foramen magnum. c. First vertebral scute narrower than second. Group 4. Tribe Chelini (Phrynops, Chelus, Chelodina, Hydromedusa) a. Lateral margins of parietals distinctly reduced. Group 5. Subtribe Chelina (Chelus, Chelodina, Hydromedusa) a. Cervical vertebrae longer than dorsal vertebrae. b. Medial portions of jugal and postorbital facing more laterally than posteriorly. Group 6. Infratribe Hydromedusad (Chelodina, Hydromedusa) a. Posterolateral process of parietal absent. b. Extremely reduced horizontal process of parietal. c. Quadrate-basiphenoid contact. d. Four claws on forefoot"--P. [1].6824899 bytesapplication/pdfen-USChelidaeChelidae -- Phylogeny.Turtles -- South AmericaTurtles -- AustraliaReptiles -- South AmericaReptiles -- Australiatext