El registro más antiguo de &lt;i&gt;Panochthus&lt;/i&gt; (Xenarthra, Glyptodontidae)

M Zamorano,Y F Scaglia,A E Zurita,G J Scillato-Yané,M Taglioretti

doi:10.3989/egeol.41443.289

Abstract

Panochthus is one of the largest sized and most frequently recorded genera of Pleistocene South American Glyptodontidae. A recent taxonomic revision shows that the genus includes six species: P. intermedius>/i> and P. subintermedius (early Pleistocene-middle Pleistocene), P. tuberculatus and P. frenzelianus (middle Pleistocene-late Pleistocene), whereas P. greslebini and P. jaguaribensis only can be referred to the Pleistocene sensu lato. In this contribution the oldest record of the genus Panochthus (MMP 5171) is presented and described. The remains came from the late Pliocene (Playa Los lobos Aloformation, Chapadmalal Formation; Chapadmalalan; Paraglyptodon chapalmalensis Biozone) of the Mar del Plata, Buenos Aires province, Argentina. The material is represented by a considerable fragment of dorsal carapace and some associated osteoderms, which are assignable to an indeterminate species of Panochthus . One of the most significant characters in the exposed surface of the osteoderms is the presence of a clear “reticular” pattern, a character only observed in Panochthus . From a biostratigraphic viewpoint, it is remarkable the absence of records of Panochthus in the Marplatan Age/Stage (late Pliocene-early Pleistocene).

Highlights

Panochthus is one of the largest sized and most frequently recorded genera of Pleistocene South American Glyptodontidae
A recent taxonomic revision shows that the genus includes
P. jaguaribensis only can be referred to the Pleistocene sensu lato

Summary

Introduction

En el único fragmento de coraza preservado (región dorsal según Moreira (1971) y Porpino & Bergqvist (2002)) de P. jaguaribensis, y en las regiones antero-dorsal y póstero-dorsal de P. intermedius, los osteodermos presentan una figura central distinguible, rodeada de varias hileras de figuritas periféricas; en el resto de la coraza de P. intermedius se observan figuritas distribuidas formando un patrón reticular (Fig. 3D). Cabe señalar que las figuritas de los osteodermos de P. tuberculatus y P. frenzelianus (ambas del Bonaerense y Lujanense) son más pequeñas, prácticamente en cualquier región de la coraza, que aquellas de P. intermedius y P. subintermedius (ambas del Ensenadense).

Results

Conclusion