|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Strophomenata - Strophomenida - Sowerbyellidae
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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.
|N. Spjeldnaes 1957 (Ptychoglyptus valdari)||A Ptychoglyptus species with thick valves, numerous ribs and variable geniculation.|
|A. Williams 1962 (Ptychoglyptus valdari)||Like P. cf. virginiensis Willard in ornamentation except for the rugae, which are more sharply crested and overfolded so that in profile both sides tend to slope anteriorly giving an undercut aspect to the posterior faces of the rugae.|