| Suborder: |
Goniatitina
|
| Superfamily: |
Pericycloidea
|
| Family: |
Muensteroceratidae
|
| Genus: |
Akeshakeceras
|
| Species: | longilobatum+ |
| Qualifier: | sn |
| Author: |
Liang & Wang 1991,p.81
|
| Lower Boundary: |
RUN Kos'vinskii gorizont base, 349 million years
|
| Upper Boundary: |
RUN Nortnichskiy gorizont top, 339 million years
|
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