<I>Chancelloriidae</I> (IMAGE) University of California - Santa Barbara Caption This is one of many spines that projected from the skin of an enigmatic animal in the group, Chancelloriidae, also from the earliest Cambrian period. Credit Susannah Porter Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.