Mylacanthus is an extinct genus of prehistoric coelacanth lobe-finned fish that lived during the Smithian (early Olenekian) age of the Early Triassic epoch in what is now Svalbard.

The fossils of both of these species were collected from the Lusitaniadalen Member of the Vikinghøgda Formation.

Mylacanthus had an estimated body length of 60 cm (24 in) to 80 cm (31 in).

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