A shadow over the cup of an upturned cockle shell. Shadows also set off the fluting along the margin. This is the shell of the heart cockle, Clinocardium nuttallii.

I like the shifting influence of sunlight and shadows on the ribs radiating over the cockle’s curved external surface. Next time you come across a complete heart cockle shell, see if you count 35 ribs.

If this post hasn’t satisfied your cockle curiosity I’ve just opened a Bivalves page where you can see more images of heart cockles (and even lean why they’re called heart cockles) and get my take on a few other common bivalves.

Shadows

5 thoughts

  1. I just rushed off to count the ribs n a couple of cockle shells in my possession (yes, I do have random shells that I like in various places) and yes! Thirty five it is! It had never occurred to me to wonder, but I’m pleased to add to my limited knowledge.

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