Posticobia norfolkensis
Posticobia norfolkensis is an extinct species of freshwater snail, an aquatic gastropod mollusk in the family Hydrobiidae, the mud snails. This species was endemic to Norfolk Island. References

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Extinct gastropods
Extinct animals of Oceania
Gastropods of Norfolk Island
Molluscs of Oceania
Molluscs of the Pacific Ocean
Gastropods described in 1900
Taxonomy articles created by Polbot