|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.
|M. A. S. McMenamin 1985||Nearly cylindrical to weakly tapering calcareous tubular shells with irreg- ular annulating rings (ribs transverse to the growth axis), striae, bands, or annular depres- sions on the outer shell surface which may be oblique or normal to the shell growth axis. Wide variation in shape and spacing of an- nulae; annular ornamentation connected and/ or cut across by longitudinal ridges parallel or oblique to growth axis.|