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Fibulariidae gen. et sp. indet.
family Fibulariidae Gray, 1855
Modern species: late Paleocene - Present (58.7 - 0.0 Ma)
Habitat: Marine
Classification
kingdom Animalia,
phylum Echinodermata
,
class Echinoidea
, order Clypeasteroida
Distribution
Pleistocene:
Ibaraki