|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Lingulata - Lingulida - Discinidae
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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||Pale-brown, subcircular Schizotreta about as wide as long, with the umbo of the subconical pedicle valve, which is almost one-fifth as deep as long, located almost one-third the length of the valve forward of the posterior margin, ventral profile steep and convex posterior to, and gently concave anterior to, the umbo, pedicle slit narrow, over 1 mm. long; brachial valve fiat or gently convex with the umbo located within 1 mm. of the posterior margin; ornamentation of both valves consisting of fine, hair-like, concentric ridges, commonly 13 per millimetre 3 mm. anterior to the ventral umbo, and also up to 8 low corrugations radiating anteriorly from the umbones.|