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:
Dugesia tiberiensis double tail. en Dugesia tiberiensis originally Planaria tiberiensis bifurcated causal region showing the course of the gut in the branch to left of figure pg pharynx gut subsidiary lobe main trunk Whitehouse The planarians of the Lake of Tiberias Journal and Proceedings of the Asiatic Society of Bengal plate