|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Bivalvia - Arcida - Glycymerididae
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|F. M. Anderson 1958||The shell is of moderate size, subcircular in outline or often subquadrate; shell inflated, surface marked by fine radial riblets near the beak, becoming coarser with growth; beaks central, the sides forming an angle of about 125 degrees; hinge plate as shown (Fig. 10), having about 8 or 10 nearly vertical teeth near the center, and about 6 heavier and more oblique teeth; interior margin in more mature examples set with about 36 denticles.|