|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Bivalvia - Pectinida - Spondylidae
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.
|E. L. Packard 1922||Shell medium size, very inequilateral, inequivalve; right valve rather flat; left valve ventricose and very rugose. Outline of left valve irregular due to its nodose character. Umbone of left valve very tumid and irregular; umbone of right valve small. Ear long, equaling about one-third the height of the shell. Left valve ornamented by rough growth lines which are in places extended into irregular, lamellar processes, giving a very rough aspect to that valve. Right valve ornamented by numerous fine radiating ribs with imbricated spaces and interspaces . Hinge and pallial line unknown. Ventral margin finely crenulated. Length of type, 72 mm.; height, 95 mm.; diameter, about 40 mm.|