Achatinella dimorpha
Achatinella dimorpha is a (presumed extinct) species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Achatinellidae. This species was present in Oahu, but has not been seen since 1967, or perhaps earlier. References

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dimorpha
Extinct gastropods
Taxonomy articles created by Polbot
ESA endangered species