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Temporal range: Devonian
The Eurypterida of New York figure 70.jpg
Restorations of Stylonurus powriensis and Pterygotus anglicus
Scientific classification e
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Merostomata
Order: Eurypterida
Superfamily: Stylonuroidea
Family: Stylonuridae
Genus: Stylonurus
Page, 1856
Type species
Stylonurus powriensis
Page, 1856

See text

Stylonurus is a genus of prehistoric eurypterid of the Family Stylonuridae.


Stylonurids, which lived from the Ordovician to Lower Permian periods, were small to very large forms with scales developing into tubercules and knobs. The prosoma (head) exhibited variable shape, with arcuate compound eyes located subcentrally, or anteriorly. Their abdomens were slender. Their walking legs were long and powerful, sometimes characterized by spines. Most genera did not have swimming legs.[1]

Stylonurus is distinguishable from other stylonurids by their smooth surface, and the greatly elongated 5th (last) pair of walking legs, which reached as far as the telson, which was long and styliform. The prosoma (head) varied from semiovate to subrectangular.[1]


The genus contains two species, one of which is of uncertain placement:

  • Stylonurus powriensis Page, 1856
= Stylonurus ensiformis Woodward, 1864
  • ?Stylonurus shaffneri Willard, 1933


  1. ^ a b Størmer, L 1955. Merostomata. Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata, P: 36.