# Stylonurus > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Stylonurus > Markdown URL: https://mediated.wiki/source/Stylonurus.md > Source: https://en.wikipedia.org/wiki/Stylonurus > Source revision: 1356038100 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) Extinct genus of Devonian organisms Stylonurus Temporal range: Devonian PreꞒ Ꞓ O S D C P T J K Pg N Restoration of S. powriensis. Scientific classification Kingdom: Animalia Phylum: Arthropoda Subphylum: Chelicerata Order: †Eurypterida Superfamily: †Stylonuroidea Family: †Stylonuridae Genus: †Stylonurus Page, 1856 Type species Stylonurus powriensis Page, 1856 Other species ?S. perspicillum Størmer, 1969 ?S. shaffneri Willard, 1933 ***Stylonurus*** is a [genus](/source/Genus) of prehistoric [eurypterid](/source/Eurypterid) of the family [Stylonuridae](/source/Stylonuridae). The genus contains three species: *Stylonurus powriensis* from the [Devonian](/source/Devonian) of [Scotland](/source/Scotland), *Stylonurus shaffneri* from the Devonian of [Pennsylvania](/source/Pennsylvania) and *Stylonurus perspicillum* from the Devonian of [Germany](/source/Germany).[1] The assignment of *S. perspicillum* and *S. schaffneri* to the genus is doubtful. A previously assigned species, *S. ensiformis*, is today regarded as synonymous with *S. powriensis*.[1] ## Description Fossil of *Stylonurus powriei* (*S. powriensis*) [2][3] [Stylonurids](/source/Stylonuridae), which lived from the [Ordovician](/source/Ordovician) to Lower [Permian](/source/Permian) periods, were small to very large forms with scales developing into [tubercles](/source/Tubercle) and knobs. The prosoma (head) exhibited variable shape, with arcuate [compound eyes](/source/Compound_eye) located subcentrally, or anteriorly. Their [abdomens](/source/Abdomen) were slender. Their walking legs were long and powerful, sometimes characterized by spines. Most genera did not have swimming legs.[4] *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](/source/Telson), which was long and styliform. The prosoma (head) varied from semiovate to subrectangular.[4] ## See also - [List of eurypterids](/source/List_of_eurypterids) - [Paleontology portal](https://en.wikipedia.org/wiki/Portal:Paleontology) ## References 1. ^ [***a***](#cite_ref-:0_1-0) [***b***](#cite_ref-:0_1-1) 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 [https://wsc.nmbe.ch](https://wsc.nmbe.ch) , version 16.0 [http://www.wsc.nmbe.ch/resources/fossils/Fossils16.0.pdf](http://www.wsc.nmbe.ch/resources/fossils/Fossils16.0.pdf) (PDF). 1. **[^](#cite_ref-2)** Woodward, Henry (1866). [*A monograph of the British fossil Crustacea, belonging to the order Merostomata*](https://www.biodiversitylibrary.org/bibliography/53733). London: Printed for the Palæontographical Society. 1. **[^](#cite_ref-3)** Kjellesvig-Waering, Erik N.; Museum, Chicago Natural History (1966). [*A revision of the families and genera of the Stylonuracea (Eurypterida)*](https://www.biodiversitylibrary.org/bibliography/5219). [Chicago]: Chicago Natural History Museum. 1. ^ [***a***](#cite_ref-ReferenceA_4-0) [***b***](#cite_ref-ReferenceA_4-1) Størmer, L 1955. Merostomata. *Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata*, P: 36. v t e Eurypterids Kingdom: Animalia Phylum: Arthropoda Subphylum: Chelicerata Clade: Euchelicerata Clade: Prosomapoda Clade: Planaterga Clade: Dekatriata Clade: Sclerophorata Taxonomy Genera List of eurypterid genera Suborder Stylonurina Kokomopteroidea Hardieopteridae Kokomopteridae Mycteropoidea Drepanopteridae Hibbertopteridae Mycteroptidae Rhenopteroidea Brachyopterellidae Brachyopteridae Rhenopteroidea Stylonuroidea Parastylonuridae Stylonurellidae Stylonuridae Suborder Eurypterina Alkenopteroidea Alkenopteridae Dolichopteroidea Dolichopteridae Erieopteridae Strobilopteridae Eurypteroidea Eurypteridae Moselopteroidea Moselopteridae Onychopterelloidea Onychopterellidae Infraorder Diploperculata Adelophthalmoidea Adelophthalmidae Nanahughmilleriidae Parahughmilleriidae Pittsfordipteridae Carcinosomatoidea Carcinosomatidae Lanarkopteridae Megalograptidae Mixopteridae Pterygotioidea Ciurcopteridae Herefordopteridae Hughmilleriidae Hunanopteridae Slimonidae Pterygotidae Waeringopteroidea Waeringopteridae Geochronology Ordovician Silurian Devonian Carboniferous Permian Geography Africa Asia Europe North America Oceania South America Notable genera Adelophthalmus Brachyopterus Campylocephalus Carcinosoma Drepanopterus Eurypterus Hibbertopterus Hughmilleria Jaekelopterus Megalograptus Megarachne Mixopterus Onychopterella Pentecopterus Pterygotus Slimonia Stylonurus Ichnogenera Arcuites Merostomichnites Palmichnium Related groups Arachnida Chasmataspidida Xiphosura Related articles Metastoma Timeline of eurypterid research Category Taxon identifiers Stylonurus Wikidata: Q2494750 Wikispecies: Stylonurus GBIF: 4650107 IRMNG: 1355702 Paleobiology Database: 19001 --- Adapted from the Wikipedia article [Stylonurus](https://en.wikipedia.org/wiki/Stylonurus) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Stylonurus?action=history)). 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