Modern and Fossil Porcelain Crabs (IMAGE) University of California - Berkeley Caption The shells, or carapaces, of a modern porcelain crab (left) and the oldest known fossil porcelain crab (right). The carapaces are 8 and 3 millimeters wide, respectively. Porcelain crabs are really members of the squat lobster family that became adapted to the same intertidal environment as true crabs. Credit Cristina Robins & Adiel Klompmaker, UC Berkeley 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.