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93 results for “Pleurodira”
FIG. 7 in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 7. — Pectoral girdle and forelimb elements of Cambaremys langertoni n. gen., n. sp. (CPP-0252); A, B, right scapula; A, cranial aspect; B, caudal aspect; C, D, right coracoid; C, dorsal aspect; D, ventral aspect; E-I, right humerus; E, dorsal aspect; F, ventral aspect; G, caudal aspect; H, cranial aspect; I, proximal aspect; J, K, left radius; J, ventral aspect; K, lateral aspect; L, right radius, ventral aspect; M-P, right ulna; M, dorsal aspect; N, ventral aspect; O, medial aspect; P, lateral aspect. Non-preserved parts indicated by stippled lines. Scale bar: 20 mm.
FIG. 6. — A-E in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 6. — A-E, plastral elements of Cambaremys langertoni n. gen., n. sp. (CPP-0252); A, B, right mesoplastron; A, ventral aspect; B, visceral aspect; C, D, right xifiplastron; C, ventral aspect; D, visceral aspect; E, composite reconstruction of the xiphiplastra in ventral and visceral aspects; F, right xifiplastron of cf. Cambaremys langertoni n. gen., n. sp. (CPP-0290) in visceral aspect. Scale bars: 20 mm.
FIG. 3 in A new freshwater turtle (Reptilia, Pleurodira, Podocnemidae) from the Upper Cretaceous (Maastrichtian) of Minas Gerais, Brazil
FIG. 3. — Partial carapace of Cambaremys langertoni n. gen., n. sp. (CPP-0252), dorsal aspect. Scale bar: 20 mm.
FIGURE 2 in Dating the origin and diversiFIcation of Pan-Chelidae (Testudines, Pleurodira) under multiple molecular clock approaches
FIGURE 2 Opening of Tasman Sea; Pal., Paleocene; P, Pliocene; Pe, Pelomedusa; Pel, Pelusios; Pelt, Peltocephalus; (cont.) Ph, Phrynops; Pl, Platemys; Ple, Pleurodira; Po, Podocnemis; Ps, Pseudemydura; Q, Quaternary; R, Rheodytes; Rh, Rhinemys. *, constrained nodes based on the TE MP topology; †, extinct taxa; ↑, origin of total groups Pan-Chelidae and Pan-Pelomedusioides. Downloaded from Brill.com10/07/2022 07:36:56PM via free access
FIGURE 3 in Dating the origin and diversiFIcation of Pan-Chelidae (Testudines, Pleurodira) under multiple molecular clock approaches
FIGURE 3 Comparison of the three dating analyses performed in this study (simplified trees). Node number as in table 2. Abbreviations of analyses as in table 1. Abbreviations of geological events as in fig. 2. Abbrevia- tions of genera as in figs. 1 and 2. * constrained nodes based on the MP topologies; ↑, origin of total groups Pan-Chelidae and Pan- Pelomedusioides.
FIGURE 4 in Dating the origin and diversiFIcation of Pan-Chelidae (Testudines, Pleurodira) under multiple molecular clock approaches
FIGURE 4 Comparison of dates produced by the three analyses of this study and four previous molecular clock studies. Abbreviations: Dea (2011), Dornburg et al. (2011); Jea (2013), Joyce et al. (2013); Pea (2017), Pereira et al. (2017); TS-M TD, This study morphological tip-dating; TS- ND, This study node-dating; TS-TE TD, This study total-evidence tip- dating; R&DF (2016), Rodrigues & Diniz-Filho (2016). Node numbers as in table 2.
Data from: A small podocnemidoid (Pleurodira, Pelomedusoides) from the Late Cretaceous of Brazil, and the innervation and carotid circulation of side-necked turtles
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Data from: The latest freshwater giants: a new Peltocephalus (Pleurodira: Podocnemididae) turtle from the Late Pleistocene of the Brazilian Amazon
<p>Overkill of large mammals is recognised as a key driver of Pleistocene megafaunal extinctions in the Americas and Australia. While this phenomenon primarily affected mega-mammals, its impact on large Quaternary reptiles has been debated. Freshwater turtles, due to the scarcity of giant forms in the Quaternary record, have been largely neglected in such discussions. Here we present a new giant podocnemidid turtle, <em>Peltocephalus maturin</em> sp. nov., from the Late Pleistocene Rio Madeira Formation in the Brazilian Amazon, that challenges this assumption. Morphological and phylogenetic analyses of the holotype, a massive partial lower jaw, reveal close affinities to extant Amazonian species and suggests an omnivorous diet. Body size regressions indicate <em>Pe. maturin</em> possibly reached about 180 cm in carapace length and is amongst the largest freshwater turtles ever found. This finding presents the latest known occurrence of giant freshwater turtles, hinting at coexistence with early human inhabitants in the Amazon.</p>
Fig. 10. Notoemys zapatocaensis, n in Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia
Fig. 10. Notoemys zapatocaensis, n.sp. Key to figure 9.
Fig. 12 in Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia
Fig. 12. Cladogram of Notoemys and close relatives.
Fig. 8. Notoemys zapatocaensis, n in Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia
Fig. 8. Notoemys zapatocaensis, n.sp. Key to figure 7.
Fig. 3. Notoemys zapatocaensis, n in Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia
Fig. 3. Notoemys zapatocaensis, n.sp. IPN ISEAC140120031. Dorsal view of carapace.
Fig. 7. Notoemys zapatocaensis, n in Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia
Fig. 7. Notoemys zapatocaensis, n.sp. IPN ISEAC140120031. Ventral view of carapace.
Fig. 4. Notoemys zapatocaensis, n in Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia
Fig. 4. Notoemys zapatocaensis, n.sp. Key to figure 3. Scales labeled on left, bones on right.
Data from: The latest freshwater giants: a new Peltocephalus (Pleurodira: Podocnemididae) turtle from the Late Pleistocene of the Brazilian Amazon
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Data from: New bothremydid turtle (Testudines, Pleurodira) from the Paleocene of north-eastern Colombia
A new turtle, Puentemys mushaisaensis, from the middle to late Paleocene Cerrejón Formation of Colombia, is described on the basis of a partial skull and many partial to nearly complete carapaces and plastrons representing multiple ontogenetic stages. Whereas P. mushaisaensis is unique in aspects of its shell morphology, it shares many diagnostic characteristics of bothremydid pleurodirans, including a long exoccipital-quadrate contact, a very low and rounded almost circular carapace, and a thinner internal bone cortex than that of the external cortex in both the carapace and plastron. With a maximum carapacial length of 151 cm, P. mushaisaensis is the largest known bothremydid turtle and represents the first occurrence of bothremydids in the Paleogene of South American tropics. Results from a cladistic analysis of bothremydids indicate that P. mushaisaensis shares a close relationship with Foxemys mechinorum from the Late Cretaceous of Europe, indicating a wide-spread geographical distribution for bothremydines during the Late Cretaceous–Paleocene.
FIGURE 5 in A new side-necked turtle (Pleurodira, Pelomedusoides) from the Santana Formation (Early Cretaceous), Araripe Basin, Northeastern Brazil
FIGURE 5. Ventral view of Caririemys violetae. Scale: 30 mm. Abbreviations: axi, axillary buttresses; cos, costal plate; ia, iliac articulation; ing, ingunal buttresses; per, peripheral plate; py, pygal plate. Scale: 30 mm.
FIGURE 3 in A new side-necked turtle (Pleurodira, Pelomedusoides) from the Santana Formation (Early Cretaceous), Araripe Basin, Northeastern Brazil
FIGURE 3. Reconstruction of the carapace of Caririemys violetae n. gen., n. sp. (MN 6919–V), dorsal aspect. Abbreviations: cos, costal plate; neu, neural plate; nuc, nuchal plate; per, peripheral plate; py, pygal plate. Scale: 30 mm.
FIGURE 1 in A new side-necked turtle (Pleurodira, Pelomedusoides) from the Santana Formation (Early Cretaceous), Araripe Basin, Northeastern Brazil
FIGURE 1. Map showing location the Araripe Basin and the members that form the Santana Formation. Ages based on Ponte & Ponte Filho (1996).
FIGURE 2 in Myuchelys gen. nov. — a new genus for Elseya latisternum and related forms of Australian freshwater turtle (Testudines: Pleurodira: Chelidae)
FIGURE 2. Dorsal and lateral views of the skulls of A. Elseya dentata (UC0302); B. Myuchelys latisternum (AM 125475) and C. Emydura macquarii (QM48034).
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