| Stylonuroidea Temporal range: Rhuddanian-Famennian,
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| Fossil of Stylonurella, a parastylonurid. | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Order: | †Eurypterida |
| Suborder: | †Stylonurina |
| Superfamily: | †Stylonuroidea Kjellesvig-Waering, 1959 |
| Type species | |
| †Stylonurus powriensis Page, 1856
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| Families | |
| Synonyms | |
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Stylonuroidea is an extinct superfamily of eurypterids, an extinct group of chelicerate arthropods commonly known as "sea scorpions". It is one of four superfamilies classified as part of the suborder Stylonurina.
Stylonuroidea, which lived from the Early Silurian to the Late Devonian, were characterized by their last pair of prosomal (head) appendages, which were developed as walking legs, or less commonly developed as swimming legs with paddles formed by the expansion of the two or three penultimate joints.[1]
- ^ Størmer, L 1955. Merostomata. Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata, P36. as Stylonuracea