| Ectosteorhachis Temporal range: Cisuralian
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Sarcopterygii |
| Clade: | Tetrapodomorpha |
| Clade: | †Megalichthyiformes |
| Family: | †Megalichthyidae |
| Genus: | †Ectosteorhachis Cope, 1880 |
| Type species | |
| †Ectosteorhachis nitidus Cope, 1880
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| Species | |
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Ectosteorhachis is an extinct genus of megalichthyid tetrapodomorphs that lived during the Permian period (Cisuralian epoch, about 299 to 272 million years ago).[1][2] Ectosteorhachis lived in freshwater environments.
- ^ Philippe Janvier; Gaël Clément; Richard Cloutier (2007). "A primitive megalichthyid fish (Sarcopterygii, Tetrapodomorpha) from the Upper Devonian of Turkey and its biogeographical implications" (PDF). Geodiversitas. 29 (2): 249–268. Archived from the original (PDF) on 2013-11-14.
- ^ Florian Witzmann; Rainer R. Schoch (2012). "A megalichthyid sarcopterygian fish from the Lower Permian (Autunian) of the Saar-Nahe Basin, Germany". Geobios. 45 (2): 241–248. Bibcode:2012Geobi..45..241W. doi:10.1016/j.geobios.2011.03.002.