Big Picture Science – Shell on Earth

by Gary Niederhoff on March 27, 2017

Big Picture Science – Shell on Earth

We all may retreat to our protective shells, but evolution has perfected the calcite variety to give some critters permanent defense against predators. So why did squids and octopuses lose their shells? Find out what these cephalopods gained by giving up the shell game.

Plus why Chesapeake Bay oyster shells are shells of their former selves. What explains the absence of the dinner-plate sized oysters of 500,000 years ago, and how conservation paleobiology is probing deep time for strategies to bring back these monster mollusks.

Also, was the Earth once encased in a giant, continental shell? A new theory of plate tectonics. Land ho!

Listen to individual segments here:
Part 1: Rowan Lockwood / Oyster Paleobiology
Part 2: Al Tanner / Naked Cephalopods
Part 3: Mike Brown / Earth’s Shell

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