| Onychopterellidae Temporal range: Late Hirnantian–Early Emsian,
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| Fossil of Tylopterella. | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Order: | †Eurypterida |
| Suborder: | †Eurypterina |
| Superfamily: | †Onychopterelloidea Lamsdell, 2011 |
| Family: | †Onychopterellidae Lamsdell, 2011 |
| Type species | |
| †Onychopterella kokomoensis Miller & Gurley, 1896
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| Genera | |
| Synonyms | |
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Onychopterellidae are an extinct family of eurypterids. The family is the only family classified as part of the superfamily Onychopterelloidea. Genera included are Alkenopterus, Onychopterella and Tylopterella.[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 http://wsc.nmbe.ch , version 16.0 http://www.wsc.nmbe.ch/resources/fossils/Fossils16.0.pdf (PDF).