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Temporal range: Permian
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sarcopterygii
Order: Osteolepiformes
Family: Megalichthyidae
Genus: Ectosteorhachis
Species: E. nitidus
Binomial name
Ectosteorhachis nitidus
Ectosteorhachis fossil

Ectosteorhachis is a genus of prehistoric lobe-finned fish that lived during the Permian period (Cisuralian epoch, about 270 to 299 million years ago). It belonged to the group of Tetrapodomorpha and to the family of Megalichthyidae.[1][2] Ectosteorhachis was a fresh water fish.


  1. ^ Philippe Janvier, Gaël Clément and 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. 
  2. ^ 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. doi:10.1016/j.geobios.2011.03.002.