| Megalograptidae Temporal range: Middle Ordovician - Late Ordovician,
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| Megalograptus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Order: | †Eurypterida |
| Infraorder: | †Diploperculata |
| Superfamily: | †Carcinosomatoidea |
| Family: | †Megalograptidae Caster & Kjellesvig-Waering, 1955 |
| Genera | |
Megalograptidae are a family of eurypterids, an extinct group of chelicerate arthropods commonly known as "sea scorpions".
The megalograptids were likely the first major successful group of eurypterids, evidenced by a Late Ordovician radiation. All known members of the Megalograptidea are from the Late Ordovician of Laurentia[1] with the exception of the large Pentecopterus from the Middle Ordovician.
- ^ O. Erik Tetlie (2007). "Distribution and dispersal history of Eurypterida (Chelicerata)" (PDF). Palaeogeography, Palaeoclimatology, Palaeoecology. 252 (3–4): 557–574. doi:10.1016/j.palaeo.2007.05.011. Archived from the original (PDF) on 2011-07-18.