Crabs (IMAGE) Smithsonian Tropical Research Institute Caption Endless forms most beautiful: the diversity of body forms among crabs, including the enigmatic Callichimaera perplexa (center). Credit Arthur Anker & Javier Luque / Figure: Javier Luque, Yale University. Usage Restrictions Credit: Arthur Anker & Javier Luque / Figure: Javier Luque, Yale University. 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.