|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||Somewhat tortuous tubes, 1 to 3 mm in diameter, about 3 cm long; walls thick, composed of grains of sand and minute calcareous organic fragments cemented by organic substance; some in groups of 2 or more attached together.|