Australdonta Snail (Australdonta radiella ssp. rurutuensis)  

This somewhat enigmatic form was described in 1879, apparently from a single specimen from the island of Rurutu that only slightly differs from the ‘normal’ Australdonta radiella (Pfeiffer) from the neighboring island of Tubuai. [1]  

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References: 

[1] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part I, Family Endodontidae. Field Museum of Natural History Chicago, Illinois 1976  

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edited: 22.03.2018