| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Polyisthmus
Taxonomy
Synonymy list
| Year | Name and author |
|---|---|
| 1969 | Polyisthmus Barthel |
| 1975 | Polyisthmus Hantzschel |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
G. †Polyisthmus Barthel 1969
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. Hantzschel 1975 | Fragmentary burrows, long-cylindrical to tapering; regularly widening and narrowing (3 to 9 mm wide); intervals of constrictions sometimes variable; cross section circular to oval; wall smooth; greatest length of fragments observed about 3 cm; whole burrow consists of 2 parallel pieces which converge V-shaped downward; mostly only washed-out fragments of whole broken burrows preserved. |