Suborder:
|
Goniatitina
|
Superfamily:
|
Dimorphoceratoidea
|
Family:
|
Girtyoceratidae
|
Subfamily:
|
Girtyoceratinae |
Qualifier:
|
fy |
Author:
|
Wedekind 1918,p.139
|
Valid:
|
Girtyoceratidae Wedekind,1918 |
Lower Boundary:
|
Up.Visean Goniatites BZ base [up.VIS], 333.5 million years
|
Upper Boundary:
|
Pendleian--Arnsbergian [PND--ARN], 324 million years
|