<I>Mellopegma</I> (IMAGE) University of California - Santa Barbara Caption This is Mellopegma, shown as an internal mold of a mollusk 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.