Topic summary
Pterygotid
Extracted from the Wikipedia article Pterygotidae.
Description
Pterygotid eurypterids, which occur in strata ranging from Late Silurian to Late Devonian in age, ranged in size from quite small animals, such as Acutiramus floweri at 20 cm (7.9 in), to the largest known arthropods to have ever lived. Several species reached and exceeded 2 metres in length, the largest known species including Jaekelopterus rhenaniae at 2.5 metres and Acutiramus bohemicus at 2.1 metres.