Fig. 6

Caudal vertebrae of sauropods from the Portezuelo Formation. Anterior caudal vertebra MCF-PVPH 917/1 in anterior, left lateral, and posterior views (A); anterior–middle caudal vertebra MCF-PVPH 917/2 in left lateral (inverted) view (B); middle caudal vertebra MCF-PVPH 917/3 in left lateral view (C); posterior caudal vertebra MCF-PVPH 916/4 in left lateral (inverted) view (D); posterior caudal vertebra MCF-PVPH 916/5 in left lateral view (E); anterior caudal vertebra of Malarguesaurus florenciae (IANIGLA-PV 110/1; modified from [30]) in anterior, left lateral, and posterior views (F); middle caudal vertebra of Malarguesaurus (IANIGLA-PV 110/3; modified from [30]) in left lateral view (G); posterior caudal vertebra of Malarguesaurus florenciae (IANIGLA-PV 110/5; modified from [30]) in left lateral view (H); posterior caudal vertebra of Malarguesaurus florenciae (IANIGLA-PV 110/6; modified from [30]) in left lateral view (I); first caudal vertebra of Futalognkosaurus dukei (MUCPv 323; modified from [31]) in anterior and posterior views (J); anterior caudal vertebra from Los Bastos locality (MMS-PV 09; modified from [41]) in anterior, left lateral, and posterior views (K); anterior caudal vertebra of MCF-PVPH 162 in anterior and left lateral views (L); middle caudal vertebra of MCF-PVPH 162 in anterior and left lateral views (M); middle caudal vertebra of MCF-PVPH 163 (modified from [54] in left lateral (inverted) view (N). Scale bars of 10 cm