| Suborder: |
Goniatitina
|
| Superfamily: |
Pericycloidea
|
| Family: |
Pericyclidae
|
| Subfamily: |
Pericyclinae
|
| Genus: |
Pericyclus
|
| Species: | trapezoidalis |
| Qualifier: | ss |
| Author: |
Crick 1899,p.432
|
| Lower Boundary: |
IRL Lower Limestone base, 350 million years
|
| Upper Boundary: |
IRL Lower Limestone top, 345.3 million years
|
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