|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Bivalvia - Hippuritida - Caprinuloideidae
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.
|S. F. Mitchell 2013||Trace of ligamentary invagination marked by an external groove in primitive forms, but lost in several later derived forms. The posterior myophore of the left valve is rooted on the posterior valve wall and separated from the body cavity by a large endomyophoral cavity formed by a lamina extending from the anterior tooth to the postero-ventral margin. Primitive forms have the anterior tooth much larger than the posterior tooth, but this is lost in some more derived forms|