Yerdi Crabs in the Ocean

The last common ancestor of all these various yeddi crabs, probably lived 30 to forty million years ago in the eastern pacific. Once they have found place to thrive, that doesn't mean that this is a forever home. In amos's words, these various ventse switch on and off through time. But it also drives home the delicatethow just how delicate these vent environments are. If human activity wipes out even one or two of these vent habitats, they could potentially limit a given species holdings to an unsustainable level.