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}
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Cientistas fazem descoberta sobre fóssil de 500 milhões de anos 691928
Tecnologia 5cw3f Cientistas fazem descoberta sobre fóssil de 500 milhões de anos 691928 Publicado
4 semanas ago on
13/05/2025
Estudo britânico analisou características do que parecia ser um molusco primitivo encontrado no sul da China
Cientistas compararam fóssil com outros chancelerídeos encontrados na mesma rocha (Imagem: Durham/Divulgação) Um fóssil do período Cambriano (há mais de 500 milhões de anos ) rendeu uma descoberta surpreendente em novo estudo do departamento de Ciências da Terra da Universidade de Durham (Reino Unido ).
Originalmente considerado um molusco primitivocaracóis e mariscos , o Shishania aculeata revelou ser, na verdade, um animal esponjoso conhecido como chancelerídeo . Ele foi descoberto pela primeira vez na província de Yunnan (China ).
Os resultados publicados na revista Science mudam a compreensão de como alguns dos primeiros animais evoluíram na época conhecida como “explosão cambriana “, de acordo com comunicado divulgado pela universidade.
Chancelerídeos viviam fixos no fundo do mar e não tinham cabeça, boca ou órgãos (Imagem: Divulgação/Durham) Fóssil é parente da esponja w4c1n Inicialmente, os cientistas acreditavam que o fóssil tinha estrutura semelhante a um pé e espinhos protetores — comuns em moluscos; No entanto, a nova análise apontou que muitas dessas características foram resultado de como o fóssil foi preservado , não da anatomia real do animal; “O mistério começou a se desvendar quando encontramos chancelerídeos preservados de maneira muito semelhante na mesma unidade rochosa”, disse o coautor do estudo, Dr. Martin Smith; Ao comparar o fóssil com outros mais bem preservados, eles descobriram que o que parecia ser um pé era apenas a parte interna do animal que havia se partido . Seu corpo se assemelha mais a uma bolsa espinhosa do que a um molusco. “Entender a Shishaniamostra como as evidências fósseis podem ser mal interpretadas e como novas descobertas continuam a remodelar o que sabemos sobre a história inicial da vida”, diz o comunicado.
Corpo se assemelha mais a uma bolsa espinhosa do que a um molusco (Imagem: Divulgação/Durham) Novas pistas 212r37 A partir da nova compreensão, o Shishania ou a ser comparado com chancelerídeos, animais “estranhos” em forma de bolsa que viviam fixos no fundo do mar e não tinham cabeça, boca ou órgãos . Seus corpos eram cobertos por espinhos ocos , possivelmente usados para defesa .
A descoberta ajuda a preencher uma lacuna no registro fóssil e mostra como os chancelerídeos (que desapareceram há cerca de 490 milhões de anos ) podem ter desenvolvido formas corporais mais complexas ao longo do tempo, segundo o artigo.
Essa reinterpretação tem implicações não apenas para a compreensão dos chancelerídeos, mas, também, para a identificação de outros fósseis ambíguos do Cambriano — e reabre questões sobre a evolução inicial dos moluscos.
Colaboração para o Olhar Digital
Jornalista formada pela Faculdade Cásper Líbero
Rodrigo Mozelli é jornalista formado pela Universidade Metodista de São Paulo (UMESP) e, atualmente, é redator do Olhar Digital.
OLHAR DIGITAL – Link original da matéria
