There's a problem for researchers trying to identify the size of ancient armored fish from the late Devonian period (approximately 382-358 million years ago): only the armored parts around their heads have been preserved in fossils.
fossils and hundreds of living fish species, particularly in terms of the relationship between internal and external mouth measurements and overall size, Engelman found that the earlier estimates were probably wide of the mark.
If the prehistoric fish had been as big as previously thought, it would've had an unusually elongated body compared to its head – with proportions even greater than modern-day eels, for example. What's more, the calculated size of the gills would've probably been too small for the fish to breathe properly.
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