Artistic representation of Teyujagua paradoxa.

Newly Discovered 250-Million-Year-Old Fierce Lizard Fossil is Named After Mythical Monster

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Who knows if the people who lived in the Paraná Basin of southern Brazil years ago saw fossils of dinosaurs and came up with strange mythical beings because of them. Whatever connection there may be, scientists have identified a new fossil near where the Guarani people live—a beautiful fossil of a creature that fills an evolutionary gap.

The previously unknown lizard lived about 250 million years ago.

The scientists have named the genus of the creature after one of the Guarani people’s mythical monsters. An article in the journal Nature states:

“Genus named after Teyú Yaguá, one of the seven legendary beasts in the mythology of the Guarani ethnic group, who occupied a large territory of central east South America, including the type locality of the new species. Teyú Yaguá, literally meaning ‘fierce lizard,’ is commonly represented as a dog-headed lizard. Species name derived from paradoxa, Greek meaning ‘paradoxical’, ‘unexpected’, owing to its unusual combination of plesiomorphic and derived characters.”

Teyujagua paradoxa holotype.

Teyujagua paradoxa holotype. ( Pinheiro et al. )

The team who found it, three Brazilian university researchers, call it a beautiful fossil. It was a small animal, similar to a crocodile. It likely lived near lakeshores and fed on fish.

An article on Guarani mythology describes the monster called Teyú Yaguá and says it is a giant lizard with a dog’s head and skin covered in gold and precious stones that it gained from rolling in the treasures of Itayu.

His eyes are believed to shoot fire, but despite this and his menacing appearance, he is said to be benign. He doesn’t move well, but that may be due to his large size.

Depiction of Teyú Yaguá from the Mythical Museum Ramón Elías

Depiction of Teyú Yaguá from the Mythical Museum Ramón Elías. ( tripfreakz)

According to legends, Teyú Yaguá s diet consists of fruit, and he is considered the protector of fruits. But his favorite food is honey, which his brother Yasy Yatere, another monster, gave him.

Not knowing about evolution led many people around the world to tell stories about how the world and its various creatures and features came into being. The Guarani believed that Teyú Yaguá was the son of Tau, the spirit of evil, and Kerana, a Guarani princess.

The couple’s story is highly important in the Guarani creation myth and belief system . Tau took form as a human and courted Kerana for seven days.

Depiction of Tau and Kerana.

Depiction of Tau and Kerana. ( Public Domain )

But the spirit of good, Angatupyry, tried to save Kerana. Angatypyry fought Tau for seven days until he defeated him. Tau went into exile. But he returned, kidnapped Kerana, and they became a couple. The goddess Arasy cursed the couple. With this curse and Tau’s malevolent nature, the pair had seven monstrous sons with different attributes and domains. Teyú Yaguá is one of these seven sons.

The fossil identified by the scientists from Brazilian universities was related to the dinosaurs’ ancestors the archosauriforms—a class of reptiles that were at the apex of the food chain before a series of volcanic eruptions nearly wiped them out about 252 million years ago. About 90 percent of Earth’s life forms that lived then were killed by the catastrophe.

Fossilized skull of the Teyujagua.

Fossilized skull of the Teyujagua. ( University of Birmingham )

Felipe Pinheiro of the Universidade Federal do Pampa was one of the scientists who discovered the fossil skull near the city of São Francisco de Assis.

He said the creature differs from other fossils of the Lower Jurassic. It is similar in anatomy to the archosauriforms and primitive reptiles, including the dinosaurs and pterosaurs, modern birds and crocodiles.

"The discovery of Teyujagua was really exciting,” Pinheiro told the BBC . “Ever since we saw that beautiful skull for the first time in the field, still mostly covered by rock, we knew we had something extraordinary in our hands. Back in the lab, after slowly exposing the bones, the fossil exceeded our expectations. It had a combination of features never seen before, indicating the unique position of Teyujagua in the evolutionary tree of an important group of vertebrates.”

Archosauromorph phylogeny showing the recovered position of Teyujagua.

Archosauromorph phylogeny showing the recovered position of Teyujagua. ( Pinheiro et al. )

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