|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||U-shaped burrows; vertical to bedding; 1 to 3 secondary galleries branching at base of U from main burrow and running parallel with it, yielding W-shaped structures; occasionally linked at bases by horizontal or oblique burrows; most additional burrows are smaller than primary gallery; individual burrows 2 to 7 mm wide; interval of limbs of U- or W-shaped structure 2 to 3 cm; length of entire system about 60 cm or more.|