Artificially evolved functional shell morphology of burrowing bivalves

The morphological evolution of bivalves is documented by a rich fossil record. It is believed that the shell shape and surface sculpture play an important role for the burrowing performance of endobenthic species. While detailed morphometric studies of bivalve shells have been done, there are almost no studies experimentally testing their dynamic properties. To investigate the functional morphology of the bivalve shell, we employed a synthetic methodology and built an experimental setup to simulate the burrowing process. Using an evolutionary algorithm and a printer that prints three dimensional (3D) objects, the first ever artificial evolution of a physical bivalve shell was performed. The result was a vertically flattened shell occupying only the top sediment layers. Insufficient control of the sediment was the major limitation of the setup and restricted the significance of the results. Nevertheless, it is demonstrated that systematic palaeontological research may substantially profit from synthetic methods. We suggest investigating functional morphologies not only by emulating the dynamical processes but also evolutionary pressure using evolutionary algorithms. Daniel P. Germann. Artificial Intelligence Laboratory, Department of Informatics, University of Zürich, Andreasstrasse 15, 8050 Zürich, Switzerland [email protected] Wolfgang Schatz. Academic Services Centre, University of Lucerne, Pfistergasse 20, 6003 Luzern, Switzerland Peter Eggenberger Hotz. Mærsk-McKinney-Møller Institute, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark