sea snails are now dying too...here is a good article outlining the severity of the issue: "In an acidified ocean there will be ecological winners and losers, but overall, marine ecosystems may change for the worse. They may become less vibrant and diverse, devoid of the animals we love and depend upon and full of those that present less value.
As ocean chemistry continues to change, the many goods and services they provide could dwindle, forcing millions of people to find new food sources, new homes and new sources of income. Adapting to these losses will take huge resources from the global community and in some cases adaptation will not be possible. A smarter future is one where we reduce carbon dioxide emissions, transition to cleaner, renewable sources of energy and prevent the need for large-scale adaptation."
http://oceana.org/en/our-work/climate-energy/ocean-acidification/learn-act/effects-of-ocean-acidification-on-marine-species-ecosystems