Discula tetrica
Discula tetrica is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Geomitridae.
This species is endemic to Bugio, List of non-marine [molluscs of Madeira|Madeira], Portugal.
Discula tetrica is listed as Critically endangered in the 1996 IUCN [Red List], but it is considered to be possibly extinct.