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:
Tryblidium reticulatum. Ventral view head region is on the upper part of the image of the fossil shell of Tryblidium reticulatum Lindstrm from Upper Silur of Gotland Sweden Zittel von archive org Grundzge der Palontologie Palonzoologie Abt Invertebrata Oldenburg Mnchen Leipzig pp archive org page page figure Karl Alfred