TaxNo: 315Helicocyclus evolutus
| Suborder: |
Goniatitina
|
| Superfamily: |
Pericycloidea
|
| Family: |
Pericyclidae
|
| Subfamily: |
Ammonellipsitinae
|
| Genus: |
Helicocyclus
|
| Species: | evolutus |
| Qualifier: | sy |
| Author: |
Librovitch 1927,p.28
|
| Valid: |
Helicocyclus tianshanicus (Li.) [TAX295] |
| Lower Boundary: |
KIT Dzhapryk Fm. base F1, 348 million years
|
| Upper Boundary: |
KIT Dzhapryk Fm. A4 top, 345 million years
|