Adelophthalmus sp. from Mazon Creek (USA).
A very small Eurypterus (sea scorpion)! Length about 4 cm.
Eurypterids adapted to freshwater and brackish water in a very early stage.
Fossils of these animals are rather common between remains of landplants.
Move the cursor over the figure to see a drawing of the fossil.
Photo, collection and drawing: Ru Smith.