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Abstract:

In this contribution, we describe new specimens of Yacarerani boliviensis from the Cajones Formation (Upper Cretaceous) of Bolivia. We focus on the postcranial anatomy of Y. boliviensis, because this anatomical region is completely unknown in other sphagesaurid notosuchians up to the present. At least eight individuals representing almost the entire postcranial skeleton are described. Although the postcranial anatomy of Yacarerani resembles that of other notosuchians in many features, five autapomorphic characters were identified: pedicles of the atlas bearing a lateral bulge; absence of rounded depressions on the dorsal surface of the anterior to middle dorsal vertebrae; coracoid bearing an oblique crest on its lateral surface; lateromedially compressed anterior ungual phalanges; and femur with a shallow depression for the M. puboischiofemoralis internus 1 and M. caudifemoralis longus. Observed variation in the postcranial anatomy of basal mesoeucrocodylians was incorporated as new characters in a phylogenetic analysis, expanding the postcranial information used in current phylogenetic data sets. The phylogenetic analysis depicts Yacarerani forming a clade with Adamantinasuchus, which is positioned at the base of Sphagesauridae. This family is well nested among a clade of 'advanced notosuchians,' and Mariliasuchus is recovered as its sister group. The cladistic analysis recovered new postcranial synapomorphies for Notosuchia and less inclusive clades, although the fact that many taxa lack postcranial remains limits the number of unambiguous postcranial synapomorphies within Notosuchia. © 2015 by the Society of Vertebrate Paleontology.

Registro:

Documento: Artículo
Título:The postcranial anatomy of Yacarerani boliviensis and the phylogenetic significance of the notosuchian postcranial skeleton
Autor:Leardi, J.M.; Pol, D.; Novas, F.E.; Suárez Riglos, M.
Filiación:CONICET, Instituto de Estudios Andinos Don Pablo Groeber, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Pabellón II, Universidad de Buenos Aires, Intendente Güiraldes 2160, Buenos Aires, 1428, Argentina
CONICET, Museo Paleontológico Egidio Feruglio, Avenida Fontana 140, Trelew, Chubut, 9100, Argentina
CONICET, Museo Argentino de Ciencias Naturales 'Bernardino Rivadavia', Av. Ángel Gallardo 470, Buenos Aires, 1405, Argentina
Museo de Historia Natural Noel Kempff Mercado, 1321 Casilla, Santa-Cruz de la Sierra, Bolivia
Palabras clave:anatomy; cladistics; cranium; Cretaceous; crocodilian; fossil record; new record; paleontology; phylogenetics; skeleton; Bolivia; Mesoeucrocodylia
Año:2015
Volumen:35
Número:6
DOI: http://dx.doi.org/10.1080/02724634.2014.995187
Título revista:Journal of Vertebrate Paleontology
Título revista abreviado:J. Vertebr. Paleontol.
ISSN:02724634
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v35_n6_p_Leardi

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Citas:

---------- APA ----------
Leardi, J.M., Pol, D., Novas, F.E. & Suárez Riglos, M. (2015) . The postcranial anatomy of Yacarerani boliviensis and the phylogenetic significance of the notosuchian postcranial skeleton. Journal of Vertebrate Paleontology, 35(6).
http://dx.doi.org/10.1080/02724634.2014.995187
---------- CHICAGO ----------
Leardi, J.M., Pol, D., Novas, F.E., Suárez Riglos, M. "The postcranial anatomy of Yacarerani boliviensis and the phylogenetic significance of the notosuchian postcranial skeleton" . Journal of Vertebrate Paleontology 35, no. 6 (2015).
http://dx.doi.org/10.1080/02724634.2014.995187
---------- MLA ----------
Leardi, J.M., Pol, D., Novas, F.E., Suárez Riglos, M. "The postcranial anatomy of Yacarerani boliviensis and the phylogenetic significance of the notosuchian postcranial skeleton" . Journal of Vertebrate Paleontology, vol. 35, no. 6, 2015.
http://dx.doi.org/10.1080/02724634.2014.995187
---------- VANCOUVER ----------
Leardi, J.M., Pol, D., Novas, F.E., Suárez Riglos, M. The postcranial anatomy of Yacarerani boliviensis and the phylogenetic significance of the notosuchian postcranial skeleton. J. Vertebr. Paleontol. 2015;35(6).
http://dx.doi.org/10.1080/02724634.2014.995187