Tag Archives: Helicarionidae

Diastole schmeltziana (Mousson)

Samoan Diastole Snail (Diastole schmeltziana)

This very variable species, which was described in the year 1865, occurs on all of the Samoan islands and seems to be a rather arboreal species.

The shell of this species reaches about 0,7 cm in diameter.


The individuals from Savai’i and Ta’u are taller than those from the other islands, and thus were originally described as a distinct form (var. usurpata (Mousson)).



[1] H. Burrington Baker: Zonitid Snails from Pacific Islands – Part 1.1. Southern genera of Microcystinae. Bernice P. Bishop Museum Bulletin 158: 1-102. 1938
[2] Robert Cowie; Rebecca J. Rundell; Falaniko Mika; Pasia Setu: The endangered partulid snail Samoana thurstoni (Cooke and Crampton, 1930) on Olosega and the land snail diversity of the Manu’a Islands, American Samoa. American Malacological Bulletin 17(1/2): 37-43. 2002
[3] Robert H. Cowie; A. C. Robinson: The decline of native Pacific island faunas: changes in status of the land snails of Samoa through the 20th century. Biological Conservation 110: 55-65. 2003



Depiction from: ‘Albert Mousson: Faune malacologique terrestre et fluviatile des îles Samoa, publiée d’après les envois de M. le Dr E. Graeffe. Journal de Conchyliologie 17: 323-390. 1869’