Lycalopex sp.

Lycalopex sp.

( Fig. 6F–G View Fig )

Referred material. PIMUZ A/V 4246, maxilla divided into two portions, (1) distal end with all the incisors, roots of the canines the and p1, and the alveolus of the right p2, and (2) dental series from P3 to partial M2 ( Fig. 6F View Fig ); distal mandibular fragment with left i3 and canine (without crown), and right i2, i3 and canine (without crown), p1, p2 and part of p3 (without crown) ( Fig. 6G View Fig ), in addition to unidentifiable fragments.

Description and comparison. PIMUZ A/V 4246 has the protocone of the P4 well developed and strongly oriented mesioligually beyond the mesial border of the tooth. Te size and morphometry of the dentition resembles specimes of Lycalopex culpaeus (see Additional file 1: Fig. S5 View Fig ). Te protocone of the P4 is well developed, while in L. culpaeus this structure is normally reduced. Due to this difference, it is not assigned to this living species.

Caninae indet.

( Fig. 6H, I View Fig )

Referred material. PIMUZ A/V 4268, right incomplete M1 without talond ( Fig. 6H View Fig ). PIMUZ A/V 4269, isolated canines, plus unidentifiable tooth fragments ( Fig. 6I View Fig ).

Description and comparison. PIMUZ A/V 4268 is a medium to large-sized canid. It is observed that it does not have a well-developed labial cingulum, unlike Aenocyon dirus . PIMUZ A/V 4268 was previously classified in the collection label as Paleocyon troglodytes , or confrontable with this species. Due to its incomplete nature, it is impossible to discard other large hypercarnivore canids recorded in SA (i.e., Teriodictis, Protocyon ). Reduction of the labial cingulum of the M1 differs from Aenocyon and most Canis species. PIMUZ A/V 4268 presents a morphology seen in others SA large canids ( Berta, 1988; Ruiz-Ramoni et al., 2022). Te size of this molar is smaller than in “ Canis ” gezi. PIMUZ A/V 4269 are canines of a small canid, but do not present diagnostic features that permit to assign them to any species.