Suborder:
|
Tornoceratina
|
Superfamily:
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Tornoceratoidea
|
Family:
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Tornoceratidae
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Subfamily:
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Tornoceratinae
|
Genus:
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Tornoceras
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Species:
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hughesii |
Qualifier:
|
ss |
Author:
|
Whidborne 1890,p.69
|
Lower Boundary:
|
Eifel.--Givetian [dm96:08,20] [EIF--GIV], 391.8 million years
|
Upper Boundary:
|
mid.--up.varcus Zone [17,00], 389 million years
|