Wormlike Fossil from the Pennsylvanian of Illinois

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Science  07 Jan 1966:
Vol. 151, Issue 3706, pp. 75-76
DOI: 10.1126/science.151.3706.75-a


Tullimonstrum gregarium was a common, possibly marine, invertebrate in certain shallow, offshore waters of northern Illinois during the Middle Pennsylvanian. It had a flexible proboscis armed with teeth; a mobile tail; and a curious transverse bar behind the head, bearing a pair of round, external organs.

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