Comparison of Hydrothermal Vent
Fossils and Fauna

Vent chimney 
Silurian age fossils discovered at the Yaman Kasy VMS deposit in the Urals can be identified as tube worms, polychaete that seem to be analogous to modern day fauna.
Tube worm
The fossil record from the site also shows brachiopods and monoplacophorans at the site.  Neither of these species is found at modern vent sites.
Squaushed tube worm
Vent fauna are well adapted creatures to their environments meaning that further major evolution in a vent area could be limited to unknown families of species modifying themselves to live in the vent
Squashed worm

The total population of hydrothermal vents is relatively small when compared to the population of earth’s fauna this would mean less mutations events.

Posssible polychaete
This lower would be somewhat compensated for by the toxic nature of the environment which would encourage a higher mutation rate.
Sources used:  BRIDGE,  Natural History Museum
Photos Courtesy of Natural History Museum

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