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TaxNo: 3751Pentagonoceras? guangyuanense
Suborder: Paraceltitina
Superfamily: Xenodiscoidea
Family: Pleuronodoceratidae
Genus: Pentagonoceras?
Species: guangyuanense
Qualifier: ss
Author: Zhao et al. 1978,p.158
Lower Boundary: Pseudotir./Pleuron.--Rotodiscoceras beds, 252 million years
Upper Boundary: Rotodiscoceras top, 251.5 million years