eurypterid

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eurypterid

any large extinct scorpion-like aquatic arthropod of the order Eurypterida, found in the SILURIAN PERIOD.
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The cheliceral claw of Acutiramus (Arthropoda: Eurypterida): functional analysis based on morphology and engineering principles.
(2005) recently demonstrated that Megarachne servinei is an aquatic Eurypterida. The giant Odonatoptera: Meganeuridae are the 'symbol' and best known of these 'giant' Car boniferous and Early Permian insects, with 34 described species.