List of data deficient molluscs
- Extinct in the wild (EW): 12 species
- Critically endangered (CR): 785 species
- Endangered (EN): 708 species
- Vulnerable (VU): 1,123 species
- Near threatened (NT, LR/cd): 823 species
- Least concern (LC): 3,526 species
- Data deficient (DD): 2,229 species
Mollusc species (IUCN, 2025.2)
- 9,502 extant species have been evaluated
- 7,273 of those are fully assessed
- 4,358 are not threatened at present
- 2,915 to 5,144 are threatened
- 308 to 476 are extinct or extinct in the wild:
- 296 extinct (EX) species
- 12 extinct in the wild (EW)
- 167 possibly extinct [CR(PE)]
- 1 possibly extinct in the wild [CR(PEW)]
In September 2016, the International Union for Conservation of Nature (IUCN) listed 1988 data deficient mollusc species. Of all evaluated mollusc species, 27% are listed as data deficient. The IUCN also lists 40 mollusc subspecies as data deficient.
No subpopulations of molluscs have been evaluated by the IUCN.
This is a complete list of data deficient mollusc species and subspecies evaluated by the IUCN.