- ... that, despite its name, the freshwater crab Potamon ibericum (pictured) does not live in Iberia?
- ... that when the sea anemone Adamsia palliata grows on the exterior of a gastropod shell, it is capable of enlarging the shell to better accommodate the hermit crab Pagurus prideaux inside?
- ... that Jurellana tithonia, dating from the Jurassic, is the earliest known porcelain crab?
- ... that several pelagic gooseneck barnacles were once found attached to an American crocodile?