|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||Long, unbranched, commonly weakly curved borings, gradually expanding distally and ending blindly; about 1 to 4 mm in diameter and 1 to 5 cm long; small aperture commonly connected to surface by numerous, diverging grooves or furrows; transverse section is nearly circular near aperture becoming oval to weakly dumbbell in outline toward the distal end; specimens representing the larger members of the genus have 4 rows of dimple-like chambers while the smaller ones do not.|