This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
PSM Fragment of cordylophora lacustris. Fragment of Cordylophora lacustris Syn Cordylophora caspia Cordylophora lacustris Allman nv Cordylophora caspia Pallas Cordylophora lacustris Allman nv Cordylophora caspia Pallas archive org Popular Science Monthly Volume Author PDold Popular Science Monthly illustrations Cordylophora