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Palaeomerycidae (Artiodactyla, Mammalia) de La Barranca (Zaragoza, España) y La Grive-Saint-Alban (Isère, Francia). Palaeomerycidae y cambios climáticos durante el Aragoniense en la Península Ibérica

Estudios Geológicos (Impact Factor: 0.46). 01/2006; DOI: 10.3989/egeol.0662157
Source: DOAJ

ABSTRACT

We describe a sample of cranial appendages and isolated dentition of the Palaeomerycids ruminants from the Upper Aragonian localities of La Barranca (Zaragoza, Spain) and La Grive-Saint-Alban (Isère, France). The most characteristic fossils are two frontal protuberances which are morphologically close to those of Ampelomeryx ginsburgi although differing on the orientation of the ossicone apex. The dentition is comparable in size and morphology to that of Ampelomeryx magnus from Sansan (France). During the Aragonian in the Central Iberian Basins three different and successive Palaemerycids assemblages are recognized. This succession could be correlated with the paleoclimatic pattern observed in the same area.

Se describen restos fósiles correspondientes a rumiantes de la familia Palaeomerycidae de los yacimientos del Aragoniense superior de La Barranca (Zaragoza, España) y de La Grive-Saint-Alban (Isère, Francia). Las piezas más notables son sendos osiconos frontales, que presentan una morfología parecida a la de Ampelomeryx ginsburgi, difiriendo en la distinta orientación de la región apical. La dentición es similar morfológica y biométricamente a la de Ampelomeryx magnus del yacimiento Aragoniense superior de Sansan (Francia). En este trabajo se apunta la hipótesis de la existencia en las cuencas centrales de la Península Ibérica de tres conjuntos diferenciados de Palaeomerycidae, cuya sucesión se relaciona con la evolución paleoclimática que sufrió dicha área geográfica durante el Aragoniense.

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Available from: Humberto Astibia, Sep 25, 2014
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    ABSTRACT: Palaeomerycids were strange three-horned Eurasian Miocene ruminants known through fossils from Spain to China. We here study their systematics, offering the first cladistic phylogeny of the best-known species of the group, and also reassess their phylogenetic position among ruminants, which is currently disputed. The beautifully preserved remains of a new palaeomerycid from middle Miocene deposits of Spain, Xenokeryx amidalae gen. et sp. nov., helps us to better understand palaeomerycid anatomy, especially that of the nuchal region in the skull, significantly improving our current knowledge on these enigmatic ruminants. Our results show two main lineages of palaeomerycids, one containing the genus Ampelomeryx diagnosed by a characteristic type of cranium / cranial appendages and some dental derived traits, and another one that clusters those forms more closely related to Triceromeryx than to Ampelomeryx, characterized by a more derived dentition and a set of apomorphic cranial features. Xenokeryx branches as a basal offshoot of this clade. Also, we find that Eurasian palaeomerycids are not closely related to North American dromomerycids, thus rejecting the currently more accepted view of palaeomerycids as the Eurasian part of the dromomerycid lineage. Instead of this, palaeomerycids are nested with the African Miocene pecoran Propalaeoryx and with giraffoids. On the other hand, dromomerycids are closely related to cervids. We define a clade Giraffomorpha that includes palaeomerycids and giraffids, and propose an emended diagnosis of the Palaeomerycidae based on cranial and postcranial characters, including several features of the cranium not described so far. We also define the Palaeomerycidae as the least inclusive clade of pecorans containing Triceromeryx and Ampelomeryx. Finally, we reassess the taxonomy of several palaeomerycid taxa.
    Full-text · Article · Dec 2015 · PLoS ONE