The sea snail, Littorina saxatilis, is found on the coast of…
The sea snail, Littorina saxatilis, is found on the coast of northern Spain. The snails farther upshore are large, with heavily ridged and banded shells, and share a border with the snails farther downshore that are smaller with smooth, unbanded shells. If the upshore and downshore snails became separate species, this would be an example of ________ speciation.
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