|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Bivalvia - Grammysiidae
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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.
|H. Hicks 1873 (Davidia)||Ovate, umbo subcentral, nearer anterior extremity, both extremities
nearly equal in width. Surface of shell raised, and almost ridged
between umbo and each end near the cardinal margin. Hinge-line
more or less straight, about a third of the length of the shell, and
extending equally on each side of the umbo. Lines of growth
The subcentral umbo, equal extremities, and almost triangular
shape of the shell are important characters, and sufficient to stamp
it a new genus.