The raptor-like species from 70 million years ago brings insights into prehistoric Patagonia
Category: Arts & Culture
In a remarkable discovery that bridges the ancient past with modern scientific inquiry, paleontologists have unearthed a new species of dinosaur named Kank australis from the Late Cretaceous period, approximately 70 million years ago, in southern Patagonia. This raptor-like dinosaur, whose name pays homage to indigenous Patagonian lore, showcases characteristics that suggest it lived an aquatic lifestyle akin to modern herons.
The excavation site, located at La Anita farm near El Calafate in Santa Cruz, Argentina, has been a hub of paleontological activity since 2018. Researchers have been digging through layers of sediment that once formed a vibrant ecosystem of meandering rivers, seasonal ponds, and lush vegetation. The fossil remains of Kank australis, which include teeth, vertebrae, and toe bones, were instrumental in identifying this new species, described in a paper published in the Journal of Vertebrate Paleontology by Dr. Matías Motta and his team.
The fossilized remains of Kank australis were first discovered in 2018 but were initially too fragmentary for identification. Subsequent excavations yielded more complete remains, including a key cervical vertebra found in 2024 that confirmed its classification as a new unenlagiid dinosaur. Unenlagiids are a family of small-to-medium sized theropod dinosaurs known for their unique adaptations, which have been found in Late Cretaceous deposits across South America, Antarctica, Australia, and Madagascar.
Dr. Motta elaborates on the significance of this find: "Kank helps bridge a distributional gap for the Late Cretaceous of southern Patagonia, connecting known records from northern Patagonia and Antarctica, and showing that this family was dispersed across different latitudes of South America." This discovery enriches the fossil record and provides insight into the evolutionary history of unenlagiids in the region.
The environment in which Kank australis thrived was markedly different from today’s conditions in Patagonia. The area was characterized by a temperate and humid climate with seasonal rainfall, supporting a diverse array of plant and animal life. Dr. Motta describes this ancient habitat: "Kank lived in a climate that was temperate and humid, with seasonal rainfall, very different from the current cold and relatively dry conditions."
Analysis of the dinosaur's cervical vertebrae reveals adaptations that suggest it was an active fisher, much like modern herons. Dr. Motta states, "The cervical vertebrae of Kank show special structures for muscle attachment and the protection of neck blood vessels—features particularly important in modern birds with complex neck movements, such as herons." This indicates that Kank likely employed similar hunting techniques, preying on fish and other aquatic creatures.
Fossil evidence suggests that Kank australis was primarily piscivorous, meaning it fed on fish. Dr. Motta explains, "Their elongated snouts, numerous teeth, and long, flexible necks suggest adaptations for fishing, similar to modern herons. In the case of Kank, its remains were found alongside fish fossils, reinforcing this idea." This dietary preference aligns with the ecological dynamics of its environment, where it coexisted with various other species, including frogs, lizards, turtles, and even early mammals like Patagorhynchus pascuali, a semi-aquatic monotreme related to modern echidnas and platypuses.
Interestingly, Kank lived alongside larger carnivores, such as Maip macrothorax, a formidable megaraptorid dinosaur that exceeded 10 meters in length. Dr. Motta notes, "Larger carnivores may have posed a threat to Kank, illustrating the complex predator-prey relationships that existed in this prehistoric ecosystem."
The name Kank is derived from Aonikenk mythology, referring to a giant rhea whose footprints formed the constellation known as Choiols, or the Southern Cross. Dr. Motta explains, "In Latin, this constellation is called Crux, which points toward the southernmost region of the planet, where Kank was discovered." The species name, australis, translates to "from south," emphasizing the geographical significance of the find.
This naming honors local culture and reflects the broader scientific narrative of the region's paleontological history. As research progresses, the team hopes to continue excavating the Chorrillo Formation, where Kank was found, to gather more data about its biology and ecological role.
Looking ahead, Dr. Motta emphasizes the importance of continued research: "Finding more Kank fossils will help us understand its biology and ecological role. We are particularly interested in investigating the environments they colonized and speciated in—especially in ecosystems dominated by large apex predators such as abelisaurids and megaraptorans."
As excavations continue, the discovery of Kank australis enriches our knowledge of dinosaur diversity during the Late Cretaceous and highlights the complex interactions within ancient ecosystems. The findings from Patagonia promise to shed light on the evolutionary pathways of theropods and their adaptations to changing environments.