| Lunataspis Temporal range:
Earliest Hirnantian
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|---|---|
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| Reconstruction of Lunataspis aurora (bottom left) and Lunataspis borealis (top right) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Order: | Xiphosura |
| Suborder: | Xiphosurida |
| Genus: | †Lunataspis Rudkin, Young & Nowlan, 2008 |
| Type species | |
| †Lunataspis aurora Rudkin, Young & Nowlan, 2008
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| Species | |
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Lunataspis is the oldest known xiphosuran. It was first formally described by David Rudkin, Graham Young and Godfrey Nolan, from fossils found in northern Manitoba, Canada in 2005; the deposit dates from the Late Ordovician, c. 445 million years ago.[1][2]
- ^ David M. Rudkin, Graham A. Young & Godfrey S. Nowlan (2008). "The oldest horseshoe crab: a new xiphosurid from Late Ordovician Konservat-Lagerstätten deposits, Manitoba, Canada". Palaeontology. 51 (1): 1–9. doi:10.1111/j.1475-4983.2007.00746.x.
- ^ Dunlop, J.A.; Penney, D.; Jekel, D. (2015). "A summary list of fossil spiders and their relatives" (PDF). World Spider Catalog. Bern, CH. Natural History Museum Bern. Archived (PDF) from the original on 2023-12-16.