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Margaritifera Schumacher, 1816
Pronounced
Mar-Garrit-if-ear-uh
Meaning
Classification
Bivalvia, Margaritiferidae Haas, 1940
Stratigraphy
Material
Shell heavy, thick and compressed without posterior lamellar teeth.
Simon Clabby 2006
   
Nippononaia Suzuki, 1941
Pronounced
Nip-on-on-eye-uh
Meaning
Classification
Bivalvia, Unionidae Fleming, 1823
Stratigraphy
Material
Subelliptical, medium-sized, with many acute V-shaped ridges centreing on line from beak to middle of ventral margin which is finely crenulate
Simon Clabby 2006
   
Unio Philipson, 1788
Pronounced
You-nee-oh
Meaning
Classification
Bivalvia, Unionidae Fleming, 1823
Stratigraphy
Material
Posterior slope generally distinct, coarse ridges on umbo looped or broken, remainder of shell smooth, periostracum with or without rays.
Simon Clabby 2006
   

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