Jaekelopterus
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Jaekelopterus is an extinct genus of eurypterid, a group of extinct aquatic arthropods. Fossils of Jaekelopterus have been discovered in deposits of Middle Silurian to Early Devonian age, from the Wen
Jaekelopterus
Fossil of J. rhenaniae at the Mineralientage München
Fossil paddle (A–B) and metastoma (C–G) of J. howelli
Chelicerae of J. howelli. A is a juvenile free ramus, B is an adult free ramus and C–D are articulated and fixed free rami from adults.
Pterygotus
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Pterygotus is an extinct genus of giant predatory eurypterid, a group of extinct aquatic arthropods. Fossils of Pterygotus have been discovered in deposits ranging in age from Middle Silurian to Late
Jaekelopterus
…2.3–2.6 metres (7.5–8.5 ft), making it the largest arthropod ever discovered, surpassing other large arthropods such as fellow eurypterids Acutiramus and Pterygotus and the millipede Arthropleura. The much smaller J. howelli only reached 80 centimetres (2.6 ft) in length. In overall appearance, Jaekelopterus is…
Pterygotus anglicus
Painting painted in 1912 by Charles R. Knight depicting various eurypterids discovered in New York. The painting includes Dolichopterus, Eusarcana, Stylonurus, Eurypterus and Hughmilleria. Pterygotus can be seen in the center-left.
Illustration of fossils of P. anglicus, including three cheliceral claws.
Cheliceral claw of P. barrandei.