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Una bizzarra creatura microscopica, con un'enorme bocca dotata di numerose escrescenze che ricordano i denti, è molto probabilmente il più antico progenitore dell'uomo. Si tratta di un organismo marino vissuto 540 milioni di anni fa e dalla particolare fisiologia (corpo a forma di sacchetto e privo di ano).
L'impronta fossile
Il saccorhytus, così denominato proprio a causa del suo aspetto, è stato identificato a partire da microfossili trovati in Cina ed è l'esempio più primitivo della categoria biologica più vasta, quella dei deuterostomi, dalla quale si sono poi sviluppati i vertebrati.
La scoperta è descritta in due articoli, uno pubblicato dall'Università del Nord-Ovest di Xi'an su Nature e l'altro dall'Università di Cambridge su Nature, Ecology and Evolution.
ANSA/dg
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