|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Pentamerida - Parastrophinidae
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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.
|A. Williams 1962||Transversely trigonal Parastrophina over four-fifths as long as wide; young shells gently biconvex and rectimarginate, adult specimens over one-half as thick as wide, wedge-shaped in lateral profile with a deeply uniplicate anterior commissure; ventral sulcus bearing up to 5 low costae with 1 or 2 additional ones commonly developed on the antero-lateral flanks; spondylial septum almost one-third as long as the pedicle valve, cruralial septum shorter, just over one-quarter as long as the brachial valve.|