Lithostrotionella custelnaui Phylum Cnidaria, Class Anthozoa, Subclass Rugosa (Milne-Edwards and Haime, 1850), Order Stauriida (Verrill, 1865), Family Petalaxidae (Fomichev, 1953), Genus Lithostrotionella (Yabe and Hayasaka, 1915) Geological Time: Mississippian Size: 80 mm Fossil Site: St. Louis, Missouri
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