Suborder:
|
Goniatitina
|
Superfamily:
|
Thalassoceratoidea
|
Family:
|
Thalassoceratidae
|
Subfamily:
|
Thalassoceratinae
|
Genus:
|
Prothalassoceras
|
Species:
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serratum |
Qualifier:
|
ss |
Author:
|
Maksimova 1948,p.23
|
Lower Boundary:
|
Gzhelian--Asselian [C--P], 299 million years
|
Upper Boundary:
|
Asselian--Sakmarian [ASS--SAK], 294.6 million years
|