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Class: CEPHALOPODA
--- Taxon Tree: AMMONOIDEA [Subclass]-GONIATITIDA [Order]-MARATHONITOIDEA [Superfamily]
------ Family: HYATTOCERATIDAE Miller & Furnish, 1957 † (Sea) (FOSSIL)
DB counters=12, Genus=2, Subgenus=0, Species=6, Subspecies=0, Synonyms=3, Images=0
DB counters include Fossil taxa: Species=6, Subspecies=0
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abichi, Hyattoceras abichi Gemmellaro, 1887 † (FOSSIL)
geinitzi, Hyattoceras geinitzi Gemmellaro, 1887 † (FOSSIL)
gerthi, Eohyattoceras gerthi Glenister & Furnish, 1987 † (FOSSIL)
guembeli, Hyattoceras guembeli Gemmellaro, 1888 † (FOSSIL)
leei, Eohyattoceras leei Glenister & Furnish, 1987 † (FOSSIL)
turgidum, Hyattoceras turgidum Gemmellaro, 1887 † (FOSSIL)
waageni, Hyattoceras waageni Smith, 1927 † - syn of: Metaperrinites cumminsi (White, 1889) † (FOSSIL)
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