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This is a list of the mammal species recorded in Saint Helena. Of the mammal species in Saint Helena, one is vulnerable.^[1]

The following tags are used to highlight each species' conservation status as assessed by the International Union for Conservation of Nature:

EX	Extinct	No reasonable doubt that the last individual has died.
EW	Extinct in the wild	Known only to survive in captivity or as a naturalized populations well outside its previous range.
CR	Critically endangered	The species is in imminent risk of extinction in the wild.
EN	Endangered	The species is facing an extremely high risk of extinction in the wild.
VU	Vulnerable	The species is facing a high risk of extinction in the wild.
NT	Near threatened	The species does not meet any of the criteria that would categorise it as risking extinction but it is likely to do so in the future.
LC	Least concern	There are no current identifiable risks to the species.
DD	Data deficient	There is inadequate information to make an assessment of the risks to this species.

Some species were assessed using an earlier set of criteria. Species assessed using this system have the following instead of near threatened and least concern categories:

LR/cd	Lower risk/conservation dependent	Species which were the focus of conservation programmes and may have moved into a higher risk category if that programme was discontinued.
LR/nt	Lower risk/near threatened	Species which are close to being classified as vulnerable but are not the subject of conservation programmes.
LR/lc	Lower risk/least concern	Species for which there are no identifiable risks.

Order: Cetacea (whales)

The order Cetacea includes whales, dolphins and porpoises. They are the mammals most fully adapted to aquatic life with a spindle-shaped nearly hairless body, protected by a thick layer of blubber, and forelimbs and tail modified to provide propulsion underwater.

Suborder: Mysticeti
- Family: Balaenopteridae
  - Genus: Balaenoptera
    - Common minke whale, Balaenoptera acutorostrata LC
    - Antarctic minke whale, Balaenoptera bonaerensis DD
    - Sei whale, Balaenoptera borealis EN
    - Bryde's whale, Balaenoptera brydei DD
    - Blue whale, Balaenoptera musculus EN
    - Fin whale, Balaenoptera physalus EN
  - Genus: Megaptera
    - Humpback whale, Megaptera novaeangliae LC^[2]
- Family: Balaenidae
  - Genus: Eubalaena
    - Southern right whale, Eubalaena australis LC^[3]
Suborder: Odontoceti
- Superfamily: Platanistoidea
  - Family: Physeteridae
    - Genus: Physeter
      - Sperm whale, Physeter macrocephalus VU
  - Family: Kogiidae
    - Genus: Kogia
      - Pygmy sperm whale, Kogia breviceps DD
      - Dwarf sperm whale, Kogia sima DD
  - Family: Ziphidae
    - Genus: Berardius
      - Arnoux's beaked whale, Berardius arnuxii DD
    - Subfamily: Hyperoodontinae
      - Genus: Mesoplodon
        Blainville's beaked whale, Mesoplodon densirostris DD
        
        Gray's beaked whale, Mesoplodon grayi DD
        
        Hector's beaked whale, Mesoplodon hectori DD
        
        Strap-toothed whale, Mesoplodon layardii DD
      - Genus: Ziphius
        Cuvier's beaked whale, Ziphius cavirostris DD
  - Family: Delphinidae (marine dolphins)
    - Genus: Steno
      - Rough-toothed dolphin, Steno bredanensis DD
    - Genus: Tursiops
      - Common bottlenose dolphin, Tursiops truncatus DD
    - Genus: Lagenodelphis
      - Fraser's dolphin, Lagenodelphis hosei DD
    - Genus: Stenella
      - Pantropical spotted dolphin, Stenella attenuata LR/cd
      - Atlantic spotted dolphin, Stenella frontalis DD
      - Spinner dolphin, Stenella longirostris LR/cd
      - Striped dolphin, Stenella coeruleoalba DD
    - Genus: Orcinus
      - Killer whale, Orcinus orca DD
    - Genus: Pseudorca
      - False killer whale, Pseudorca crassidens LR/lc
    - Genus: Feresa
      - Pygmy killer whale, Feresa attenuata DD
    - Genus: Globicephala
      - Short-finned pilot whale, Globicephala macrorhynchus DD
    - Genus: Peponocephala
      - Melon-headed whale, Peponocephala electra DD

Order: Carnivora (carnivorans)

There are over 260 species of carnivorans, the majority of which feed primarily on meat. They have a characteristic skull shape and dentition.

Suborder: Caniformia
- Family: Otariidae (eared seals, sealions)
  - Genus: Arctophoca
    - Subantarctic fur seal, A. tropicalis LC
- Family: Phocidae (earless seals)
  - Genus: Hydrurga
    - Leopard seal, H. leptonyx LC
  - Genus: Mirounga
    - Southern elephant seal, M. leonina LC

Notes

^ This list is derived from the IUCN Red List which lists species of mammals and includes those mammals that have recently been classified as extinct (since 1500 AD). The taxonomy and naming of the individual species is based on those used in existing Wikipedia articles as of 21 May 2007 and supplemented by the common names and taxonomy from the IUCN, Smithsonian Institution, or University of Michigan where no Wikipedia article was available.
^ "Whales & dolphins: St Helena | Guidelines & Information" (PDF). EMD St. Helena.
^ Richards, R. (2009). "Past and present distributions of southern right whales (Eubalaena australis)". New Zealand Journal of Zoology. 36. The Royal Society of New Zealand: 447–459. doi:10.1080/03014223.2009.9651477. eISSN 1175-8821. ISSN 0301-4223.

References

"The IUCN Red List of Threatened Species: Mammals of Saint Helena". IUCN. 2001. Retrieved 22 May 2007. ^{[dead link‍]}
"Mammal Species of the World". Smithsonian National Museum of Natural History. 2005. Archived from the original on 27 April 2007. Retrieved 22 May 2007.
"Animal Diversity Web". University of Michigan Museum of Zoology. 1995–2006. Retrieved 22 May 2007.