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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Paracrinoidea - Comarocystitida - Amygdalocystitidae
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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.
|R. S. Bassler 1950 (Billingsocystis)||Theca ovoid-oblong slightly flattened, with food-groove system imperfectly known but apparently confined to a single short, transverse, relatively deep, semilunate groove. No branches of this groove and no facets for the attachment of arms are present. Thecal plates many, all strongly ridged in a direction radiate to the angles. Columns cylindrical consisting of very thin columnals attached to the invaginated base.|