The Lewis Law
in the CCP layer of bivalves where
n is the number of sides of a prism,
is the average area of prisms of
n sides,
is the average area of prisms. The species analysed belong to different orders and superfamilies of the bivalve subclass Pteriomorphia: order Pteroida, superfamily Pinnoidea (
Pinna rudis (gradient
α = 0.32),
Atrina pectinata (
α = 0.29)), superfamily Pterioidea (
Pinctada margaritifera (
α = 0.27),
Pteria hirundo (
α= 0.33),
Pteria penguin (
α = 0.34),
Vulsella vulsella (
α = 0.26),
Isognomon isognomon (
α = 0.39)), order Ostreoida, superfamily Ostreoidea (
Ostrea edulis (
α = 0.38)). The relationship is linear for the common prisms with good statistics whose number of sides is close to six.