ARQUEÓLOGOS ENCONTRAM NOVO FÓSSIL DE MAMÍFERO MISTERIOSO
Autor: Professor Efrem | Publicado: 2012-08-27T22:08:00-03:00

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O fóssil de um mamífero que viveu 57 milhões de anos atrás
pode ajudar a explicar como ocorreu a evolução dos animais que passaram a
dominar a Terra após a morte dos dinossauros. O espécime foi encontrado na
Mongólia e analisado por uma equipe de especialistas russos.
Os dinossauros foram os principais animais na superfície do planeta até
cerca de 65 milhões de anos atrás, quando o impacto de um meteoro contra a
Terra levou à extinção deles. Isso deu espaço à ascensão dos mamíferos, que
ainda eram muito diferentes dos atuais.


O Ernanodon antelios é um desses animais. Em 1979, um fóssil já
havia sido encontrado na União Soviética, mas estava incompleto. A descoberta
mais recente trouxe peças que faltavam na montagem do quebra-cabeça.


O animal tinha patas fortes e garras grandes ideais para cavar buracos. As
escavações podem ter servido na busca por alimentos, por abrigo, ou mesmo pelas
duas coisas.


O atual estudo, publicado pelo “Journal of Vertebrate Paleontology”,
concluiu que esse animal está na base da evolução que levou à família dos
pangolins – um animal nativo da Ásia e da África que tem o corpo coberto por
escamas e se alimenta de insetos.


Outra corrente dizia que ele seria mais próximo dos tatus e dos tamanduás,
mas os novos dados desmentiram a hipótese. A melhor compreensão das
características e dos hábitos desses mamíferos pode dar dicas de como a
evolução dos mamíferos levou aos animais que existem hoje em dia.


“Poucos outros mamíferos fósseis apresentavam tanta controvérsia no mundo
científico quanto o Ernanodon, e estamos contentes que o novo
esqueleto nos tenha ajudado a resolvê-la”, afirmou Peter Kondrashov, da
Universidade AT Still, nos Estados Unidos.


http://g1.globo.com/ciencia-e-saude/noticia/2012/08/arqueologos-encontram-novo-fossil-de-mamifero-misterioso.html




&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
1. No que diz respeito à teoria da evolução,
qual seria a vantagem adaptativa do Ernanodon antelios em
relação aos dinossauros? Explique.