Wednesday, March 18, 2015
Juvenile flat periwinkles
These are juvenile flat periwinkles (Littorina obtusata) developing in a blob of jelly on the surface of a seaweed. Each animal, developing inside its translucent, delicate, helical shell, is about half a millimetre in diameter at this stage. When it hatches from the jelly this marine snail will eventually reach a diameter of about one and half centimetres.
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