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Temporal range: Late Ordovician–Devonian
Fossil of Eurypterus
Scientific classification e
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Merostomata
Order: Eurypterida
Suborder: Eurypterina
Superfamily: Eurypteroidea
Burmeister, 1843

Eurypteroidea are an extinct superfamily of eurypterids. It contains four families (Dolichopteridae, Eurypteridae, Erieopteridae, Strobilopteridae), two of which only contain one genus each (Eurypteridae and Erieopteridae), and two genera of uncertain classification, Paraeurypterus and Pentlandopterus.[1]


Eurypteroidea, which lived from the Ordovician to Permian periods, were characterized by their last pair of prosomal (head) appendages, which were developed as swimming legs, carrying paddles formed by the expansion of the two penultimate joints.[2]



  1. ^ Dunlop, J. A., Penney, D. & Jekel, D. 2015. A summary list of fossil spiders and their relatives. In World Spider Catalog. Natural History Museum Bern, online at, version 16.0 (PDF).
  2. ^ Størmer, L 1955. Merostomata. Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata, P30. as Eurypteracea