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I suspect this to be the case because these Earth reptiles are so well adapted to their environments that they have changed very little in tens of millions of years. - (Explorers of Gor, Chapter 32, Sentence #725)

In the pool, clambering over one another, lifting their jaws upward were crocodiles, beasts like river tharlarion but differently hided and plated". I nodded. The marsh tharlarion, and river tharlarion, of Gor are, I suspect, genetically different from the alligators, caimans, and crocodiles of Earth. I suspect this to be the case because these Earth reptiles are so well adapted to their environments that they have changed very little in tens of millions of years. The marsh and river tharlarion, accordingly, if descended from such beasts, brought long ago to Gor on Voyages of Acquisition by Priest-Kings, would presumably resemble them more closely. On the other hand, of course, I may be mistaken in this matter. It remains my speculation, however, that the resemblance between these forms of beasts, which are considerable, particularly in bodily configuration and disposition, may be accounted for by convergent evolution; this process, alert to the exigencies of survival, has, I suspect, in the context of similar environments, similarly shaped these oviparous predators of two worlds. - (Explorers of Gor)