|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Strophomenata - Strophomenida - Strophomenidae
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||Subquadrate to subtrigonal Microtrypa with art evenly concavo-convex adult profile about one-quarter as deep as long; radial ornamentation cancellated, consisting of fine costellae, commonly spaced at 6 per millimetre antero-medianly and divided into narrow sectors by thickened costae and costellae; dental lamellae short, widely divergent and continuous with a pair of curved ridges which almost surround a small rhomboidal muscle-field, adductor scars wide and separated by a thin median ridge; cardinal process high, notothyrial platform prolonged as a short median septum continuous anteriorly with a pair of subparallel pustulose ridges with a fine median ridge lying between, another pair of short divergent septa are located anterior to the socket plates and are continuous with an outer pair of long, pustulose, subparallel ridges.|