List of endangered molluscs

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<imagemap> File:Circle frame.svg|220px poly 100 100 200 100 199 99 100 100 14 extinct in the wild mollusc species (0.20%) poly 100 100 199 99 199 97 199 95 199 93 199 91 199 89 199 87 198 85 198 83 198 81 197 79 197 78 196 76 196 74 195 72 195 70 194 68 193 66 193 64 192 62 191 60 190 59 189 57 189 55 188 53 187 52 186 50 185 49 100 100 581 critically endangered mollusc species (8.4%) poly 100 100 185 49 184 48 183 46 182 44 181 43 180 41 179 39 177 38 176 36 175 35 173 33 172 32 171 30 169 29 168 28 166 26 165 25 163 24 162 22 160 21 159 20 157 19 155 18 154 17 100 100 507 endangered mollusc species (7.3%) poly 100 100 154 17 152 15 150 14 149 13 147 12 145 12 143 11 142 10 140 9 138 8 136 7 134 7 132 6 130 5 128 5 127 4 125 4 123 3 121 3 119 2 117 2 115 2 113 1 111 1 109 1 107 1 105 1 103 1 101 1 99 1 97 1 95 1 93 1 91 1 89 1 87 1 85 2 83 2 81 2 79 3 78 3 100 100 879 vulnerable mollusc species (13%) poly 100 100 78 3 76 3 74 4 72 4 70 5 68 6 66 6 64 7 62 8 60 8 59 9 57 10 55 11 53 12 51 13 50 14 48 15 46 16 45 17 43 18 41 19 40 20 38 22 36 23 35 24 35 24 100 100 535 near threatened mollusc species (7.7%) poly 100 100 35 24 33 26 32 27 30 28 29 30 27 31 26 33 25 34 23 36 22 37 21 39 20 40 18 42 17 44 16 45 15 47 14 49 13 50 12 52 11 54 10 56 9 57 8 59 8 61 7 63 6 65 5 67 5 69 4 71 4 72 3 74 2 76 2 78 2 80 1 82 1 84 1 86 0 88 0 90 0 92 0 94 0 96 0 98 0 100 0 102 0 104 0 106 0 108 0 110 0 112 0 114 1 116 1 118 1 120 2 122 2 124 3 126 3 128 4 130 4 132 5 133 6 135 6 137 7 139 8 141 9 143 10 144 11 146 12 148 12 150 13 152 15 153 16 155 17 157 18 158 19 160 20 161 21 163 23 165 24 166 25 168 27 169 28 170 29 172 31 173 32 175 34 176 35 177 37 179 39 180 40 181 42 182 43 183 45 184 47 185 48 187 50 188 52 188 54 189 56 190 57 191 59 192 61 193 63 194 65 194 67 195 68 196 70 196 72 197 74 197 76 198 77 198 100 100 2437 least concern mollusc species (35%) poly 100 100 77 198 79 198 81 199 83 199 85 199 87 200 89 200 91 200 93 200 95 200 97 200 99 200 101 200 103 200 105 200 107 200 109 200 111 200 113 200 115 199 117 199 118 199 120 198 122 198 124 197 126 197 128 196 130 196 132 195 134 194 136 194 138 193 139 192 141 191 143 191 145 190 147 189 148 188 150 187 152 186 154 185 155 184 157 182 158 181 160 180 162 179 163 178 165 176 166 175 168 174 169 172 171 171 172 169 173 168 175 166 176 165 177 163 179 162 180 160 181 159 182 157 183 155 184 154 185 152 186 150 187 148 188 147 189 145 190 143 191 141 192 139 192 138 193 136 194 134 194 132 195 130 196 128 196 126 197 124 197 122 198 120 198 118 198 116 199 114 199 112 199 110 199 108 199 106 199 104 199 102 200 101 100 100 1988 data deficient mollusc species (29%) desc none </imagemap>

Mollusc species (IUCN, 2020.1)
  • 6941 extant species have been evaluated
  • 4953 of those are fully assessed[a]
  • 2972 are not threatened at present[b]
  • 1967 to 3955 are threatened[c]
  • 324 to 441 are extinct or extinct in the wild:
    • 311 extinct (EX) species[d]
    • 13 extinct in the wild (EW)
    • 117 possibly extinct [CR(PE)]
    • 0 possibly extinct in the wild [CR(PEW)]
  1. ^ excludes data deficient evaluations.
  2. ^ NT, LR/cd, LC.
  3. ^ Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
  4. ^ Chart omits extinct (EX) species
Endangered (EN) species are considered to be facing a very high risk of extinction in the wild.

In September 2016, the International Union for Conservation of Nature (IUCN) listed 507 endangered mollusc species.[1] Of all evaluated mollusc species, 7.0% are listed as endangered. The IUCN also lists nine mollusc subspecies as endangered.

No subpopulations of molluscs have been evaluated by the IUCN.

For a species to be considered endangered by the IUCN it must meet certain quantitative criteria which are designed to classify taxa facing "a very high risk of extinction". An even higher risk is faced by critically endangered species, which meet the quantitative criteria for endangered species. Critically endangered molluscs are listed separately. There are 1088 mollusc species which are endangered or critically endangered.

Additionally 1988 mollusc species (27% of those evaluated) are listed as data deficient, meaning there is insufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, they are intrinsically likely to be threatened, according to the IUCN.[2] While the category of data deficient indicates that no assessment of extinction risk has been made for the taxa, the IUCN notes that it may be appropriate to give them "the same degree of attention as threatened taxa, at least until their status can be assessed".[3]

This is a complete list of endangered mollusc species and subspecies evaluated by the IUCN.

Gastropods

There are 448 species and seven subspecies of gastropod assessed as endangered.

Stylommatophora

Stylommatophora is a very diverse group that includes the majority of land snails and slugs. There are 187 species and two subspecies in the order Stylommatophora assessed as endangered.

A shell of Eua zebrina
A live specimen of Samoa diaphana
A live specimen of Newcombia cumingi
A shell of Partulina variabilis
A gathering of live specimens of Ctenophila setiliris in Réunion
A live individual of Gonospira uvula
Live individuals of Helix texta
A live specimen Iberus gualtieranus
Different views of a shell of Xerocrassa montserratensis
A live individual of Megalobulimus parafragilior
Different views of a shell of Patera clenchi
Different views of a shell of Sculptiferussacia clausiliaeformis
Several empty shells of Truncatellina arcyensis
A shell of Vertigo heldi

Partulids

Achatinellids

Cerastids

Endodontids

Charopids

Helicarionids

Orthalicids

Species

Subspecies

Euconulids

Streptaxids

Species

Subspecies

Camaenids

Helicids

Hygromiids

Other stylommatophoran species

Littorinimorpha

There are 147 littorinimorph species and three subspecies assessed as endangered.

A live individual of Antrobia culveri
A live specimen of Belgrandiella wawrai

Hydrobiids

Bithyniids

Species

Subspecies

Assimineids

Pomatiopsids

Other Littorinimorpha species

Sorbeoconcha

Architaenioglossa

Species

Subspecies

Cycloneritimorpha

Hygrophila species

There are 22 Hygrophila species assessed as endangered.

Planorbids

Lymnaeids

Neogastropoda

Other gastropod species

Bivalvia

There are 57 species and two subspecies in the class Bivalvia assessed as endangered.

Unionida

There are 54 species and two subspecies in the order Unionoida assessed as endangered.

Margaritiferids

Unionids

Species

Subspecies

Other Unionida species

Venerida

Cephalopods

See also

References

  1. ^ "IUCN Red List version 2016-2". The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources. Archived from the original on 27 June 2014. Retrieved 8 September 2016.
  2. ^ "Limitations of the Data". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources. Archived from the original on 7 October 2018. Retrieved 11 January 2016.
  3. ^ "2001 Categories & Criteria (version 3.1)". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources. Archived from the original on 8 October 2008. Retrieved 11 January 2016.


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