Amphidolops, Tejedor & Goin & Gelfo & López & Bond & Carlini & Scillato-Yané & Woodburne & Chornogubsky & Aragón & Reguero & Czaplewski & Vincon & Martin & Ciancio, 2009

Tejedor, Marcelo F., Goin, Francisco J., Gelfo, Javier N., López, Guillermo, Bond, Mariano, Carlini, Alfredo A., Scillato-Yané, Gustavo J., Woodburne, Michael O., Chornogubsky, Laura, Aragón, Eugenio, Reguero, Marcelo A., Czaplewski, Nicholas J., Vincon, Sergio, Martin, Gabriel M. & Ciancio, Martín R., 2009, New Early Eocene Mammalian Fauna from Western Patagonia, Argentina, American Museum Novitates 3638, pp. 1-43 : 18

Amphidolops , sp. nov. 2

LIEB-PV 1187, a right m2, and several isolated lower and upper molars from both localities of Paso del Sapo are referred to this new species. With respect to other species of Amphidolops , it is intermediate in size between A. sp. nov. 1 and A. yapa . It differs from A. serrula in its more linear labial side on m2; cusps of lower molars are more distinct; hypoconid of m1–2 is more developed and placed more anteriorly; and M1 has two cusp rows. This new taxon differs from A. sp. nov. 1 by having two lines of labial cusps in M1 and more lingual cusps in m2.

Superorder Xenarthra Cope, 1889 Order Cingulata Illiger, 1811 Family Dasypodidae Gray, 1821 Subfamily Dasypodinae Gray, 1821 Tribe Astegotheriini Ameghino, 1906 Genus Riostegotherium Oliveira and Bergqvist, 1998 Riostegotherium , sp. nov. Figure 5A, B

Several isolated plates of the dorsal carapace of this new taxon were recovered at La Barda and Laguna Fría. These are small dasypodids similar in size to the living Dasypus hybridus or D. septencinctus , with very thin osteoderms having fine punctations on their surface, and central figure in the semimovable plates, as seen in R. yanei , from the Itaboraian of Brazil ( Oliveira and Bergqvist, 1998). The foramina surrounding the central figure are placed in an arch, but are fewer than in R. yanei . The central keel in the central figure on the exposed surface is not well defined. There are few relatively large foramina on the posterior margin.

Genus Prostegotherium Ameghino, 1902

Figures

Fig. 5. Dasypodidae from Laguna Fría (LF) and La Barda (LB) assemblages. A, scutes of Riostegotherium sp. nov. from LF; B, scutes of Riostegotherium sp. nov. from LB; C, scutes of Prostegotherium cf. astrifer from LF; D, scutes of Prostegotherium cf. astrifer from LB; E, scutes of Astegotherium sp. nov. from LF; F, scutes of Stegosimpsonia sp. nov. from LF (also in LB, but not shown). Scale bar 5 10 mm.