Bivalve vs Gastropod

[david_admin]

Hello,

Even if there is 4 time more (I did not check), when you go to a beach, just in front it is usually sandy areas, and there you will find mostly bibalves... that is the main logic reason. And I can say that in France, on sandy bay you will mainly find dead bivalves and on rocky shorelines you wil lfind a lot gasteropds...

Though, you must consider also degres of rarity of shells, you can have more species but they are all rare... versus less species but much more common...

Hope that help you,
DAVID