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Rissoina achatina Odhner 1924
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Image of Rissoina achatina Odhner 1924
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tangatawhenua
iNaturalist
Total guess but based on the Rissoina chathamensis and Rissoina anguina that I have found :D Found under a rock in the shallow sub tidal.
Image of Rissoina achatina Odhner 1924
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tangatawhenua
iNaturalist
Maybe one of the Rissoina whanau. Low intertidal zone.
Image of Rissoina achatina Odhner 1924
cc-by-nc-4.0
tangatawhenua
iNaturalist
I think this is one of the Rissoina genus. About 5mm Mid intertidal zone under a rock.