Testudodiscula testudinalis
Testudodiscula testudinalis a species of small land snail, a terrestrial pulmonate gastropod mollusc in the family Geomitridae. Distribution
This species is endemic to the island of Madeira, Portugal. Shell description
The shell of these snails is shaped like a discus, or a lens, with a sharp edge around the periphery of the whorls. Conservation status
This species is critically endangered, as mentioned in annex IV of Habitats Directive. References

Discula
Gastropods described in 1852