Eurypterids (sea scorpions)


This group of Chelicerata, known from the Ordovician period, was thriving in the Silurian and Devonian waters, but their numbers began to decline from the middle of the Devon. The group became extinct during the Permian.

The earliest lived in the sea, and later expand to the freshwater, maybe spend some time on the land.

Eurypterids were predators, probably hunting the early fishes, but the competition with big predatory fishes might play a role in their decline. 

Most species were about 10-40 centimetres in length. But the largest of them ,Jaekelopterus rhenaniae, is estimated to be 2.5 m in length, and it was the largest Arthropod, that ever lived. Genus Pterygotus was the second-largest group, up to 1,8-2,3 m.

Eutypterid encyclopedia

Eurypterids (from the Greek word eury- meaning “broad” or “wide” and the Greek word pteron meaning “wing”) are an extinct group of arthropods related to arachnids which include the largest known arthropods that ever lived. Eurypterids predate the earliest fishes. The largest, such as Jaekelopterus, reached 2.5 metres (8 ft 2 in) or more in length. They were  formidable predators that thrived in warm shallow water, in both seas and lakes.

One of my professors would give “super quizzes” near the end of the semester.  They had about 30 questions and would be graded out of 10 (so you could theoretically get 30/10).  He sometimes gave out prizes for the highest scores, which is how I got Yuri-chan the eurypterid.

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