Like Achatinella, they belong to the primitive suborder Orthurethra. Partula filosa , Tahiti. Many species are tree snails and are known for their colorful shells. Unfortunately, many partulid species are becoming extinct because of ill-founded and unsuccessful attempts to control introduced pest snails. Samoana conica , American Samoa.
All land snail have calcium carbonate crystals in their egg shells.
The crystals are not evident in the more gelatinous eggs, but the eggs of some species are encased in a thick calcium covering, appearing like minature hen's eggs. Samoana diaphana , Moorea. Another member of the Partulidae, these snails were found only in the tops of tallest trees, and on bushes at the highest elevations. Now presumably extinct. The shells are pigmentless and translucent.