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PRI 42897Acutiramus macrophthalmus

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Class:
Merostomata
Order:
Eurypterida
Family:
Pterygotidae
Genus/Species:
Acutiramus macrophthalmus
Rock Unit:
Fiddler's Green Formation
Age:
Upper Silurian (410 million years old)
Locality:
Passage Gulf, Herkimer Co., New York (collected in 1965)

Notes:

Seen here on the steps of PRI, this specimen of Acutiramus is the largest known eurypterid fossil in the world (1.26 meters long; over 4 feet). Fossils of individual segments and body parts hint at even larger sea scorpions (more than 2 meters in length). The body of Acutiramus differed greatly from the typical eurypterid design (as seen in Eurypterus remipes). This genus is distinguished by a scale-like pattern on the "shell", large bulbous eyes, unusually large claws and teeth, and a paddle-like tail.