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Eusthenopteron was a large, predatory, lobe-finned fish that reached up to 1.8-2.1 m in size, and lived in coastal marine or brackish waters (Hesse and Sawh, 1992). Eusthenopteron is the most thoroughly studied of the Osteolepiform order because its fossil specimens have the best-preserved endoskeletons of all the families of Osteolepidida (Janvier 1996). It had an intracranial joint like many other lobe-finned fish, and its elasmoid scales were similar to lungfishes and many ray-finned fishes. Scores of specimens of Eusthenopteron (including this one) have been collected in Quebec, Canada (Cloutier et al., 2011). Its fossils are also known to be found in Latvia and Poland.

References:

Cloutier, R., Proust, J.-N. and Tessier, B. (2011) The miguasha fossil-fish-lagerstätte: A consequence of the Devonian land–sea interactions, Palaeobiodiversity and Palaeoenvironments, 91, pp. 293–323. doi:10.1007/s12549-011-0058-0.

Hesse, R. and Sawh, H. (1992) Geology and sedimentology of the Upper Devonian Escuminac Formation, Quebec, and evaluation of its paleoenvironment: Lacustrine versus estuarine turbidite sequence, Atlantic Geology, 28(3). doi:10.4138/1867.

Janvier, P. (1996) Early Vertebrates. Oxford: Clarendon Press. p. 216