Sinployea tenuicostata
Sinployea tenuicostata was a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Charopidae. This species was endemic to the Cook Islands, but has not been found since 1899 and is believed to be extinct. References

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Extinct gastropods
Extinct animals of Oceania
Fauna of the Cook Islands
Molluscs of Oceania
Gastropods described in 1872
Taxonomy articles created by Polbot