•   Extinct in the wild (EW): 2 species
•   Critically endangered (CR): 853 species
•   Endangered (EN): 1,533 species
•   Vulnerable (VU): 1,578 species
•   Near threatened (NT, LR/cd): 1,119 species
•   Least concern (LC): 8,632 species
•   Data deficient (DD): 4,644 species

Invertebrate species (IUCN, 2025.2)

• 18,442 extant species have been evaluated
• 13,798 of those are fully assessed^[a]
• 9,751 are not threatened at present^[b]
• 4,047 to 8,691 are threatened^[c]
• 83 to 255 are extinct or extinct in the wild:
  • 81 extinct (EX) species^[d]
  • 2 extinct in the wild (EW)
  • 171 possibly extinct [CR(PE)]
  • 1 possibly extinct in the wild [CR(PEW)]

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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

As of July 2016, the International Union for Conservation of Nature (IUCN) lists 6919 least concern invertebrate species.^[1] 38% of all evaluated invertebrate species are listed as least concern. The IUCN also lists 32 invertebrate subspecies as least concern.

No subpopulations of invertebrates have been evaluated by the IUCN.

This is a complete list of least concern invertebrate species and subspecies as evaluated by the IUCN.

• Argonemertes hillii

There are 2437 mollusc species and five mollusc subspecies assessed as least concern.

There are 301 species in the phylum Cnidaria assessed as least concern.

There are 293 species in the class Anthozoa assessed as least concern.

• Golden anemone (Condylactis aurantiaca)
• Fat anemone (Cribrinopsis crassa)

• Clavularia crassa

There are 290 species in the order Scleractinia assessed as least concern.

• Astrangia poculata

There are 4069 arthropod species and 27 arthropod subspecies assessed as least concern.

There are 111 echinoderm species assessed as least concern.

• Lists of IUCN Red List least concern species
• List of near threatened invertebrates
• List of vulnerable invertebrates
• List of endangered invertebrates
• List of critically endangered invertebrates
• List of recently extinct invertebrates
• List of data deficient invertebrates