|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
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.
|W. Hantzschel 1975||Regular calyx-shaped depressions; smaller ones similar to impression of lower part of very large hazelnut; inner walls smooth; “calyx” 15 to 40 mm in diameter, 5 to 15 mm in depth; 2 or 3 small circular depressions on the bottom representing outlets of filled burrows, 2 to 5 mm in diameter.|