Addittions to the knowledge of Urumaquia robusta (Xenarthra, Phyllophaga, Megatheriidae) from the Urumaco Formation (Late Miocene), Estado Falcón, Venezuela

CARLINI, A. A.; BRANDONI, D.; SANCHÉZ, R.

PALAEONTOLOGISCHE ZEITSCHRIFT

SPRINGER HEIDELBERG

Lugar: HEIDELBERG; Año: 2008 vol. 82 p. 153 - 162

0031-0220

We describe new remains of Urumaqia robusta CARLINI, BRANDONI & SÁNCHEZ, 2006, that significantly improve the knowledge of the species and allow a more precise discussion about the relationships with the rest of the South American Megatheriinae. The new remains (ulna, phalanx, femora, patella, tibia, astragalus, navicular, metatarsals IV-V ? here described suggest a close relationship of this taxon with the species of Pyramiodontherium and with Megatheriops rectidens, based on morphological similarities of the ulna (length, gracility), femur (general morphology, shape of the medial margin), and astragalus (angle between the discoidal and odontoid facets, position of the navicular facet with respect to the discoidal facet). However, and despite the increasing information concerning Tertiary species, their phylogenetic relationships are only partially understood.