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Un fossile di pesce palla risalente a 520 milioni di anni fa è stato scoperto in Cina da un gruppo di ricerca dell'Università britannica di Leicester. Il ritrovamento, che somiglia a un nido d'uccello schiacciato, poiché il processo di fossilizzazione ha appiattito lo scheletro, contribuirà a far luce sulla vita negli oceani preistorici.
Il fossile è stato chiamato Niderlic pugio e appartiene ad una famiglia di pesci a forma di palloncino con uno schelettro esterno dalla funzione difensiva e che, secondo gli esperti, potrà aiutare a capire il comportamento dell'animale di fronte ad altre creature del mare o predatori.
L'area di ritrovamento è ricchissima di fossili marini e ve ne sono già stati rinvenuti alcuni di progenitori di granchi, aragoste e vermi preistorici, molti dei quali compresi di parti molli come occhi, fegato e cervello.
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