caa a22 4500 445326093 CHVBK 20180317142721.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10914-011-9154-1 doi (NATIONALLICENCE)springer-10.1007/s10914-011-9154-1 A New Extinct Genus of Cavioidea (Rodentia, Hystricognathi) from the Miocene of Patagonia (Argentina) and the Evolution of Cavioid Mandibular Morphology [Elektronische Daten] [María Pérez, María Vucetich] The family Caviidae is represented in modern faunas by cavies and maras, whereas the family Hydrochoeridae is represented by capybaras. The evolutionary origin of these families has been related to a diversity of plesiomorphic fossil forms (recorded from the late Oligocene up to the middle Miocene) traditionally grouped in the family "Eocardiidae”. These fossil forms were included, together with Caviidae and Hydrochoeridae, within the Cavioidea s.s. (sensu stricto), because they share high crowned cheek teeth, double-hearted occlusal surface, short lower incisors, and moderate hystricognathy. Within Cavioidea s.s., caviids and hydrochoerids were interpreted as forming its crown group, because they have unique craniomandibular and dental features. In this contribution, a new taxon of Cavioidea s.s. from the middle Miocene of central Patagonia, Argentina, is described, and its phylogenetic position is determined on the basis of a morphological cladistic analysis in which "eocardiids” were included. The study permits the understanding of the sequence of appearance of characters that originated the highly divergent morphology of crown-group cavioids. The analysis of the sequence of appearance of the characters that traditionally diagnosed the crown group indicates that these changes did not occur at the same time. On the contrary, many of these features seem to have appeared at different nodes of the evolutionary history of Cavioidea s.s. The remarkably derived morphology of modern cavioids is the result of a stepwise appearance of a mosaic of evolutionary innovations that originated gradually along the history of Cavioidea during the late-middle Miocene. Springer Science+Business Media, LLC, 2011 Hystricognathi nationallicence Cavioidea nationallicence Phylogeny nationallicence Neogene nationallicence South America nationallicence Pérez María Museo Paleontológico Egidio Feruglio, Av. Fontana 140, U9100GYO, Trelew, Chubut, Argentina aut Vucetich María Departamento Científico Paleontología de Vertebrados, Museo de La Plata, Paseo del Bosque s/n B1900FWA, La Plata, Argentina aut Journal of Mammalian Evolution Springer US; http://www.springer-ny.com 18/3(2011-09-01), 163-183 1064-7554 18:3<163 2011 18 10914 https://doi.org/10.1007/s10914-011-9154-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10914-011-9154-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pérez María Museo Paleontológico Egidio Feruglio, Av. Fontana 140, U9100GYO, Trelew, Chubut, Argentina aut NATIONALLICENCE 700 1- Vucetich María Departamento Científico Paleontología de Vertebrados, Museo de La Plata, Paseo del Bosque s/n B1900FWA, La Plata, Argentina aut NATIONALLICENCE 773 0- Journal of Mammalian Evolution Springer US; http://www.springer-ny.com 18/3(2011-09-01), 163-183 1064-7554 18:3<163 2011 18 10914 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer