Répteis antigos passavam de quatro para duas patas conforme amadureciam

Um parente dos crocodilos recém-descrito do final do período Triássico começava a vida caminhando sobre quatro patas antes de adotar uma postura bípede na fase adulta, afirmam cientistas. O Sonselasuchus cedrus, do tamanho de um poodle e desenterrado no Arizona, revela padrões de crescimento incomuns em répteis antigos. Os pesquisadores detalharam as descobertas em um estudo publicado este ano.

Fósseis de Sonselasuchus cedrus, um réptil shuvosaurídeo, mostram que ele provavelmente tinha membros anteriores e posteriores proporcionais quando jovem, com as patas traseiras crescendo e tornando-se mais robustas ao longo do tempo. O autor principal, Elliott Armour Smith, estudante de pós-graduação da Universidade de Washington, disse que a equipe analisou as proporções dos membros para determinar essa mudança. 'Essencialmente, acreditamos que essas criaturas começavam suas vidas em quatro patas... e depois passavam a caminhar sobre duas patas à medida que cresciam', explicou Armour Smith. 'Isso é particularmente peculiar.'

Artigos relacionados

Scientists have identified a new species of ancient crocodile relative that walked upright on two legs with a toothless beak. The creature, named Labrujasuchus expectatus, lived during the Late Triassic in what is now New Mexico.

Reportado por IA

Newly examined fossils indicate that the earliest four-limbed vertebrates developed directly into adults without a larval phase featuring external gills.

Scientists have used genetic analysis of historic specimens to determine that the crocodiles once found in the Seychelles were not a unique species but an isolated population of saltwater crocodiles. The reptiles likely reached the remote islands after drifting across the Indian Ocean. The population was wiped out within decades of permanent human settlement in 1770.

Reportado por IA

Researchers have described a previously unknown crocodile species that lived alongside early human ancestors in Ethiopia more than 3 million years ago. The animal, formally named Crocodylus lucivenator, was likely the top predator in its ecosystem.

A new study shows millipedes colonized land nearly 460 million years ago. The research completes the evolutionary tree for all living millipede orders. It was published in Current Biology in 2026.

Reportado por IA

Researchers have named a newly identified juvenile dinosaur species Doolysaurus huhmini, discovered on Aphae Island in South Korea. The fossil, the first from the country to include skull parts, reveals a turkey-sized animal that likely had a fluffy appearance and an omnivorous diet. The findings, led by Jongyun Jung, were published on March 19 in the journal Fossil Record.

sexta-feira, 29 de maio de 2026, 11:35h

New dinosaur species from patagonia hunted like herons

sexta-feira, 22 de maio de 2026, 00:47h

Study solves mystery of reptile bone armor evolution

quarta-feira, 20 de maio de 2026, 10:56h

Study links T. rex tiny arms to powerful skull evolution

domingo, 17 de maio de 2026, 13:27h

150-million-year-old stegosaur skull unearthed in Spain

sexta-feira, 15 de maio de 2026, 21:13h

Scientists identify giant new dinosaur species in Thailand

terça-feira, 12 de maio de 2026, 21:50h

New giant dinosaur species unearthed in Patagonia

sábado, 25 de abril de 2026, 17:59h

Fossil jaws reveal giant ancient octopuses as apex predators

terça-feira, 21 de abril de 2026, 10:35h

Tiny fossils identified as baby ankylosaurs after 20 years

quarta-feira, 15 de abril de 2026, 06:21h

Virginia Tech student reconstructs rare dinosaur skull revealing new species

quarta-feira, 15 de abril de 2026, 02:07h

Fossil confirms mammal ancestors laid eggs after mass extinction

Este site usa cookies

Usamos cookies para análise para melhorar nosso site. Leia nossa política de privacidade para mais informações.
Recusar