|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Strophomenata - Strophomenida - Bimuriidae
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.
|A. Williams 1962||Strongly concavo-convex Craspedelia with a broad, median, ventral fold and corresponding dorsal sulcus, outline semi-elliptical, mucronate and less than one-half as long as wide, ventrally deflected flange to the shell up to 1 mm. long; surface smooth, socket ridges widely splayed, brachial apparatus subpetaloid, just over one-half of the length of the valve, about three-quarters as long as wide and consisting of a median septum and a pair of submedian, narrowly divergent septa forming the inner boundaries of a pair of strongly elevated, triangular and fimbriated platforms; ventral interior with small unsupported teeth and a strong, long, median ridge, muscle-scars not impressed.|