from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various large, segmented aquatic arthropods of the order Eurypterida that existed from the Ordovician Period to the Permian Period.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A large, prehistoric, carnivorous arthropod, of the order Eurypterida, thought to be one of the first animals to venture onto land.

from The Century Dictionary and Cyclopedia

  • n. A merostome crustacean of the family Eurypteridæ.
  • Having the characters of or pertaining to Eurypterus or the Eurypteridæ.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. large extinct scorpion-like arthropod considered related to horseshoe crabs


From New Latin Eurypterida, order name, from Eurypterus, genus name : eury- + Greek pteron, wing; see -pter.
(American Heritage® Dictionary of the English Language, Fourth Edition)


  • My favorite is his drawing of a eurypterid / sea scorpion.

    Luskin, Haeckel, Richardson, Richards - The Panda's Thumb

  • This paper, with Hünicken as a coauthor, revises the identity of this fossil as a “bizarre eurypterid”, a water scorpion Eurypterida.

    Archive 2006-02-01

  • What all this summons into my mind, as I continue the path of free association from T.S. Eliot through my eurypterid to Rhyniognatha, is H.P. Lovecraft's splendid novella, "At the Mountains of Madness" (1936), one of his few genuine science-fiction stories, and a dazzling one.

    Asimov's Science Fiction

  • Gradually the antique types of the Paleozoic fauna died out, and in the Permian rocks are found the last survivors of the cystoid, the trilobite, and the eurypterid, and of many long-lived families of brachiopods, mollusks, and other invertebrates.

    The Elements of Geology

  • It is the largest known walking trackway of a eurypterid or any invertebrate animal.

    BBC News | News Front Page | World Edition

  • The discovery is the largest known walking trackway of a eurypterid or any invertebrate animal. news, business, sport, the Daily Telegraph newspaper, Sunday Telegraph

  • But whenever I read it it calls forth for me an image that surely was nothing at all like what Eliot had in mind: that silent sea is, for me, the paleozoic one of the Cambrian or Silurian period of four hundred million years ago, and the owner of that pair of ragged claws is the curious mud-crawling creature known as a _eurypterid, _ a vaguely lobsterish thing that reached lengths of eight feet and more.

    Asimov's Science Fiction


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