An incomplete rostrum and mandible referred to the family Platanistidae based on the presence of a lateral grove between the maxilla and premaxilla. Based on the shape, it's believed that this could fall within the subfamily Pomatodelphininae. At the time of description, the material was the oldest record of dolphins in South America.[1]
An astrapotheriid known from a partial skull and parts of the postcrania. When compared to other in the family, the animal has a unique dental formula: having an extra incisor on the lower dentition.[2]
A potamotrygonid that's similar to members of both Miocene and modern day Argentina. Though there aren't any completely diagnostic features in the material, they most likely belong to the genus Potamotrygon.
An alligatorid named based on strange teeth but is also known from a maxilary fragment. The animal had two types of teeth being smaller, acorn-shaped teeth in the front and larger, more conical teeth in the back.[5]
A proterotheriid that has jumped between multiple genera including the current one, Prothoatherium, and Lambdaconus. It is the smallest genus within the family, being the comparable in size to adianthids.
A thylacosmilid known from multiple skulls with a lower and longer skull along with postcanine teeth that are less curved than other members of the family.[7]
An enigmatic teleost known from scales. Based on the size of these scales, the animal could have potentially have had a similar niche seen in the modern day Arapaima.[8]
A teiid known from a skull of a young individual that can't be placed in a specific species. Even with this being the case, the dental changes in the individual are similar to what is seen in extant members of the genus.[13]
A teiid known from both cranial and postcranial material; though due to the absence of diagnostic features, it was referred to the genus based on the size of the material.[13]
A large podocnemidid named for the short skull and the presence of maxillary processes in the position of canines seen in mammals. Though a large turtle, the animal would have most likely been smaller than S. geographica. The material from the formation was the first material of the genus to be found outside of Brazil.[14][15]
A chelid known from an articulated shell with sets of knobs on the edges of the carapace. The neural spines seen in the taxa are larger than those seen in extant species.[16]
A chelid known from a shell and other postcrania. Within the shell, there wouldn't have been a connection between the neural and nuchal bones of the shell like seen in other members of the genus.[17]
A podocnemidid that was attributed to Podocnemididae incertae sedis at one point but was later reattributed to the genus. Unlike other podocnemidids, its mesoplastra is almost rectangular.[18]
P. tatacoensis
A podocnemidid known from a shell that shows a pathology on the left side, potentially caused by a failed predation attempt. When compared to living species, this taxa is distinguished by the 8th neural.[18]
A chlamyphorid that was originally described as a species of Astegotherium but was later moved to the genus Boreostemma. The species is known from extremely complete material, the animal shows a mix of more basal and derived features of Glyptodontinae.[20]
B. gigantea
A chlamyphorid that was originally described as a species of Astegotherium but was later moved to the genus Boreostemma. Besides the larger size, another important trait is that of the second lower molariform which is more complex than in other southern taxa.[19]
A mylodontoid known from an incomplete skull and tibia with features similar to what is seen within the genus Nematherium. However due to the materials features being seen in all species within the genus, it's unable to be assigned it to a specific one.
A medium-sized dasypodid with the proportionally shortest mobile osteoderms within the subfamily Dasypodinae. The patterns of the fixed osteoderms resemble those seen in chlamyphorids.[22]
A small pampatheriid with ornamented surfaces on its osteoderms along with thinner fixed osteoderms away from the edges. The distribution patterns of the genus are similar to what is seen to Boreostemma.[23]
