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Phylum: Brachiopoda
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Phylum: Mollusca
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Phylum: Mollusca Class: Gastropoda
Pennsylvanian and Permian
Genus: Amphiscapha
Genus: Straparolus
Genus: Bellerophon
Genus: Pharkidonotus
Genus: Trepospira
Genus: Worthenia
Genus: Worthenia
Genus: Gosseletina
Genus: Leptotygma
Genus: Leptotygma
Genus: Bellerophon
Genus: Knightites
Genus: Straparolus
Genus: Worthenia (They are often much smaller than this)
large gastropod from Chautauqua County
Genus: Euphemites
Genus: Knightites
Genus: Meekospira
Genus: Pseudozygopleura
badly-smashed gastropod (nothing worth displaying)
Genus: Trepospira
Genus: Naticopsis
Genus: Playceras from Topeka Limestone near Moline
Genus: Straparolus
Cretaceous
Genus: Bellifusus (from Blue Hill Shale)
Genus: Turritella
Genus: Turritella
gastropod from the Kiowa Shale, Ellsworth County
Genus: Tylostoma