Pterygotidae
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Pterygotidae is a family of eurypterids, an extinct group of aquatic arthropods. They were members of the superfamily Pterygotioidea. Pterygotids were the largest known arthropods to have ever lived w
Acutiramus cummingsi
Fossil segment of Erettopterus osiliensis, showcasing the distinct scale-like ornamentation of the pterygotids.
Pterygotus and other eurypterids illustrated by Joseph Smit in 1896.
Restoration of Pterygotus hunting Birkenia.
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
Pterygotidae
…members of the superfamily Pterygotioidea. Pterygotids were the largest known arthropods to have ever lived with some members of the family, such as Jaekelopterus and Acutiramus, exceeding 2 metres (6.6 ft) in length. Their fossilized remains have been recovered in deposits ranging in age from 428 to 372 million…
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.