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Titolo:
The oldest and first nearly complete skeleton of a chelid, of the Hydromedusa sub-group (Chelidae, Pleurodira), from the Upper Cretaceous of Patagonia
Autore:
de la Fuente, M; de Broin, FD; de Bianco, TM;
Indirizzi:
Natl Univ La Plata, Dept Paleontol Vertebrados, Fac Ciencias Nat, RA-1900 La Plata, Argentina Natl Univ La Plata La Plata Argentina RA-1900 A-1900 La Plata, Argentina Museo La Plata, RA-1900 La Plata, Argentina Museo La Plata La Plata Argentina RA-1900 a, RA-1900 La Plata, Argentina CNRS, Lab Paleontol, UMR 8569, Museum Natl Hist Nat, F-75005 Paris, FranceCNRS Paris France F-75005 9, Museum Natl Hist Nat, F-75005 Paris, France Univ Nacl Sur, Dept Geol, RA-8000 Bahia Blanca, Argentina Univ Nacl Sur Bahia Blanca Argentina RA-8000 000 Bahia Blanca, Argentina
Titolo Testata:
BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE
fascicolo: 2, volume: 172, anno: 2001,
pagine: 237 - 244
SICI:
0037-9409(2001)172:2<237:TOAFNC>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Keywords:
chelonii; Chelidae; upper cretaceous; patagonia; systematics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: de la Fuente, M Natl Univ La Plata, Dept Paleontol Vertebrados, Fac Ciencias Nat, Paseo Bosque S-N, RA-1900 La Plata, Argentina Natl Univ La Plata Paseo Bosque S-N La Plata Argentina RA-1900
Citazione:
M. de la Fuente et al., "The oldest and first nearly complete skeleton of a chelid, of the Hydromedusa sub-group (Chelidae, Pleurodira), from the Upper Cretaceous of Patagonia", B SOC GEOL, 172(2), 2001, pp. 237-244

Abstract

A new pleurodiran (side necked) turtle is described on material From the Upper Cretaceous of Patagonia, from sediments outcropping at Cerro Blanco, Yaminue Creek, Rio Negro, Argentina. The sediments are compared to those from the Pellegrini lake area referred to the middle Member of the Alien Formation, Upper Campanian-Lower Maastrichtian. Yaminuechelys gasparinii n. g., n. sp., is a pleurodiran turtle on the pelvis sutured to the shell and a chelid on the formula of cervical vertebrae and the lateral cheek emargination, deeply extended towards las here) or up to the posterior emargination. It is the oldest record of a nearly complete skeleton of a chelid, long necked (elongated cervical vertebrae, lowered skull), and tile first sufficiently known of the Chelodina-Hydromedusa group (elongated skull, lowered neural arch and centrum of the cervicals, low zygapophyses processes, strong polygoned decoration) and of the Hydromedusa sub-group (widened inner nares byreduced palatine ossification). The carapace is 41,8 cm long. It is more primitive than Hydromedusa (Eocene-Extant, South America) and retains primitive characters either still present or no more present in the other chelidsof the Pseudemydrua, Emydura and Phrynops groups (short necked) and Chelusgroup (long necked), representing the anterior clades of phyletic diversification [Gaffney, 1977], or evolutive grades, of the family. Such are plesiomorphic, relative to Hydromedusa, the less pronounced lateral skull emargination, wider and longer hyoid elements, wider nucal and cervical, this notdrawn back, presence of lateral mesoplastra, not shortened bridge, straight borders of the not shortened and not widened posterior plastral lobe, amphicoelous sacrals and caudal vertebrae uniting amphicoelous, concavoplaty-(i.e. anteriorly concave, posteriorly flat) and procoelous or weakly procoelous elements. As Hydromedusa, Yaminuechelys n. g. retains primitive characters such as the long serie of neurals, the very lateral attachment of the axillar and inguinal processes and the attachment of the pelvis, below pleural 8 (and 7 in the extant form) and a small part of the suprapygal, and theischitatic sutures prolonged on the xiphiplastral points. It is distinguished by the apomorphic presence of a wide and week anterior carapacial notch. Yaminuechelys n. g., or aff. Yaminuechelys spp. are known in Patagonia byfragmentary remains in a dozen of Upper Cretaceous and two Palaeocene localities. Before them, chelids are known in the world only by undefined smaller forms from Lower Albian and Upper Albian-Cenomanian Patagonian localities. In Australia, they are known from Palaeocene-Lower Eoccne (no Cretaceousdata before) with already extant Australian diversified forms. Yaminuechelys n.g, demonstrates how long the diversification in chelids is realized inSouth Gondwana before the full break of thr continents.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 10:25:18