- Brachyopterus stubblefieldi (1951)
- Pterygotus anglicus (1844)
- Eurypterus remipes (1825)
Hemiaspis and Eurypterus by BioDivLibrary on Flickr.
‘Eurypterids (sea scorpions) are an extinct group of arthropods related to arachnids which include the largest known arthropods that ever lived. They are members of the extinct order Eurypterida (Chelicerata); which is the most diverse Paleozoic chelicerate order in terms of species… They went extinct during the Permian–Triassic extinction event 251 million years ago.’
A monograph of the British fossil Crustacea,.
London,Printed for the Palæontographical Society,1866-78..
Top: Stylonurus is a genus of eurypterid with long appendages and and extremely long telson. Unlike most other eurypterids it does not have the paddle-shaped appendages, so it probably crawled on the bottom of the sea floor.