Suborder:
|
Tornoceratina
|
Superfamily:
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Prionoceratoidea
|
Family:
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Prionoceratidae
|
Subfamily:
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Prionoceratinae
|
Genus:
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Balvia
|
Species:
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sp. indet. |
Qualifier:
|
of |
Author:
|
Schindewolf 1937,p.29
|
Lower Boundary:
|
UD6A2--UD6B:Balvia(M.) lens base [18,20], 363.2 million years
|
Upper Boundary:
|
UD6E--UD6F:Cym.nigra--A.prorsum [19,40], 360 million years
|