photo credit: An artist's impression of the Tully Monster. Sean McMahon/Yale University The mysterious Tullimonstrum gregarium – a 307-million-year-old creature unearthed from coal quarries in Illinois – is one of the world’s most controversial fossils. This 10-centimeter-long (4 inch) animal had a soft, striped body, a large tail, a big trunk-like proboscis with a claw-like jaw filled with little sharp teeth, and a stiff bar with dark, oval-shaped blobs at either end, presumably eyes on a stal