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Any of various large segmented aquatic arthropods of the order Eurypterida that existed from the Ordovician Period to the Permian Period, having a long tail often with a spinelike appendage at the tip. Also called sea scorpion.

[From New Latin Eurypterida, order name, from Eurypterus, genus name : eury- + Greek pteron, wing; see -pter.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Animals) any large extinct scorpion-like aquatic arthropod of the group Eurypterida, of Palaeozoic times, thought to be related to the horseshoe crabs
[C19: from New Latin Eurypterida, from eury- + Greek pteron wing, feather]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(yʊˈrɪp tə rɪd, yə-)

any extinct aquatic arthropod of the Paleozoic order Eurypterida, related to horseshoe crabs.
[1870–75; < New Latin Eurypteridae. See eury-, -pterous, -id2]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.eurypterid - large extinct scorpion-like arthropod considered related to horseshoe crabs
arthropod - invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
Eurypterida, order Eurypterida - extinct aquatic arthropods of the Paleozoic
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The low taxonomic diversity of the invertebrate fauna, which comprises leperditids and lingulid brachiopods, the gastropod Eurymyella, and eurypterid specimens, is suggestive of shallow marine to non-marine, perhaps estuarine or lagoonal, conditions (Boucot's BA1, as in Turner 1999).
TEHRAN (FNA)- The findings by a team of researchers reinterpreted the habits, capabilities, and ecological role of the giant pterygotid eurypterid, the largest arthropod that ever lived.
Invertebrate remains include those of small smooth-shelled bivalves, ostracods, conchostacans, and a eurypterid (Gess & Hiller 1995a).
The big kahuna of New York fossils is the eurypterid, or giant sea scorpion.
The giant sea-scorpion, or eurypterid, lived at a time when arthropods - the jointed legged animals that include insects, spiders and crabs - were much larger than today.
1996), the millipede Gaspestria genselorum (Wilson 2006), and the eurypterid cf.
EURYPTERID fossils are fairly common in New York State but very rare in the rest of the world.
Eurypterid phylogeny with remarks on the origin of arachnids.
In middle Saaremaa, microlaminated argillaceous Eurypterus-dolostones or domerites contain often lingulid, eurypterid, and agnathan remains (Uduvere-968 core, depth 3.0-6.0 m; Kuressaare-804 core, depth 22.0-25.7 m; Suurlahe-738 core, depth 17.5-22.5 m).
She attributed this trackway to swimming arthropods, tentatively proposing a eurypterid track maker.
New York's state fossil is the eurypterid. A close relative of horseshoe crabs, scorpions and spiders, the eurypterid lived more than 400 million years ago.
The fossil arachnid genus Eurymartus Matthew, 1895 and the eurypterid genus Eurypterella Matthew, 1889 from the 'Fern Ledges' of Saint John, New Brunswick, Canada.