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BRASIL & MUNDO

Ossos de maior dinossauro já descoberto são achados na Argentina

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Ossos fossilizados de um dinossauro que se acredita ser a maior criatura que já andou na Terra foram desenterrados na Argentina, dizem paleontólogos.

Fósseis são de 100 milhões de anos atrás (Foto: BBC)

Fósseis são de 100 milhões de anos atrás (Foto: BBC)

Ao medir o comprimento e a circunferência do maior fêmur (osso da coxa) encontrado, os cientistas estimaram que o dinossauro tinha 40 metros de comprimento e 20 metros de altura – quando esticava o pescoço.

Com 77 toneladas, seria tão pesado quanto 14 elefantes africanos e sete toneladas mais pesado do que o recordista anterior, o Argentinosaurus, também encontrado na Patagônia.

Os cientistas acreditam que é uma nova espécie de titanossauro – enormes herbívoros que datam do período Cretáceo.

Um trabalhador agrícola local tropeçou sobre seus restos no deserto perto de La Flecha, cerca de 250 quilômetros a oeste de Trelew, Patagônia.

Os fósseis foram escavados em seguida, por uma equipe do Museu de Paleontologia Egidio Feruglio, liderada por José Luis Carballido e Diego Pol.

Eles desenterraram os esqueletos parciais de sete dinossauros – cerca de 150 ossos no total – tudo em ‘condição notável’.

Uma equipe de filmagem da unidade de História Natural da BBC capturou o momento em que os cientistas perceberam exatamente o quão grande era a sua descoberta.

“Dado o tamanho desses ossos, o novo dinossauro é o maior animal conhecido que andou na Terra”, os pesquisadores disseram à BBC News.

“Com o seu pescoço esticado, ele tinha cerca de 20 metros de altura – o equivalente a um edifício de sete andares”, acrescentaram.

Este herbívoro gigante viveu nas florestas da Patagônia entre 95 e 100 milhões de anos atrás, acreditam os cientistas, com base na idade das rochas em que foram encontrados os ossos.

Mas, apesar de sua magnitude, ele ainda não tem um nome. ‘Ele terá um nome que descreva sua magnificência e em homenagem à região e aos proprietários rurais que nos alertaram sobre a descoberta’, disseram os pesquisadores.

Houve muitos candidatos anteriores ao título de ‘maior dinossauro do mundo’. O mais recente pretendente ao trono foi o Argentinosaurus, um tipo similar de saurópode.

Originalmente, pensou-se que ele pesava 100 toneladas, mais tarde, porém, a estimativa foi revisada para cerca de 70 toneladas.

É complicado estimar o peso dos dinossauros – há mais de uma técnica e, em geral, os cálculos se baseiam em esqueletos incompletos.

O peso Argentinosaurus foi estimado a partir de somente alguns ossos, mas no caso da nova descoberta os pesquisadores tinham dezenas para trabalhar, tornando-os mais confiantes na sua estimativa.

Paul Barrett, especialista em dinossauros do Museu de História Natural de Londres, concorda que a nova espécie é ‘realmente uma grande criatura’. Ele advertiu, porém, que é difícil ter certeza sobre seu tamanho preciso, pois as estimativas são feitas com informações incompletas. (G1)

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