Partula gibba (Fat Guam Partula) is a species of snails in the family Partulidae. They are listed as critically endangered by IUCN. Individuals can grow to 16.6 mm.
Definition: A taxon is Critically Endangered when the best available evidence indicates that it meets \r\nany of the criteria A to E for Critically Endangered, and it is therefore considered to be facing an extremely high risk of extinction in the wild