Suborder:
|
Paraceltitina
|
Superfamily:
|
Xenodiscoidea
|
Family:
|
Xenodiscidae
|
Genus:
|
Tompophiceras
|
Species:
|
gerbaense |
Qualifier:
|
ss |
Author:
|
Popov 1961,p.29
|
Lower Boundary:
|
Permian--Triassic (Induan base), 251 million years
|
Upper Boundary:
|
Griesbachian--Dienerian [GRI--DIE], 250.3 million years
|