Eatoniella mortoni

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Eatoniella mortoni
Holotype of Eatoniella mortoni from Auckland War Memorial Museum
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Family: Eatoniellidae
Genus: Eatoniella
E. mortoni
Binomial name
Eatoniella mortoni
Ponder, 1965
  • Eatoniella (Dardanula) mortoni Ponder 1965

Eatoniella mortoni is a

mollusc in the family Eatoniellidae.[1] First described by Winston Ponder in 1965, it is endemic to the waters of New Zealand. The species has been used to study the effects of ocean acidification, as it is known to thrive in carbon dioxide
-rich environments.


The species was described as Eatoniella (Dardanula) mortoni in 1965 by Winston Ponder, who named it after New Zealand biologist John Morton. Morton had assisted Ponder during his early investigations into the species.[2] Ponder synonymised several previously-named genera, including Iredale's 1915 genus Dardanula, which was retained as a subgenus of Eatoniella.[2]


Eatoniella mortoni has a solid, conical, smooth shell. The shells are widely variable in colour, from purple-tinted dark grey to pale yellow-grey.[2] The species measures 1.85 millimetres by 1.13 millimetres.[3]


The species is often found living on kelp such as Ecklonia radiata

The species is endemic to New Zealand.[1] The holotype was collected by Ponder himself on 11 December 1961, at Days Bay in Wellington.[4] The species is known to occur on both coasts of the North Island and South Island.[5][2][6][7] In addition, the species can be found on the Chatham Islands[2] and the volcanic island Whakaari / White Island.[8]

Typically the species can be found on algae at low tide,[2] and underneath intertidal rocks,[5] and often lives on kelp species such as Ecklonia radiata.[9]

Ocean acidification studies

Different angle views of an Eatoniella mortoni specimen found in Abel Tasman National Park

Eatoniella mortoni has been used as a species to study ocean acidification, as the species benefits from living in carbon dioxide-rich environments and remains localised,[9][10][11][12] especially specimens sourced from the volcanic island Whakaari / White Island, due to their lifetime exposure to carbon dioxide vents.[13] Eatoniella mortoni can produce more crystalline, durable and less porous shells at natural carbon dioxide vents.[14]


  1. ^ a b c Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. (2022). "Eatoniella mortoni Ponder, 1965". MolluscaBase. World Register of Marine Species. Retrieved 15 November 2022.
  2. ^
    Wikidata Q58676802
  3. ^ "Eatoniella mortoni". New Zealand Mollusca. Retrieved 20 November 2022.
  4. S2CID 229670783
    . Retrieved 20 October 2022.
  5. ^ . Retrieved 17 November 2022.
  6. ^ "Eatoniella mortoni". Auckland War Memorial Museum. Retrieved 17 November 2022.
  7. ^ "marine snail, Eatoniella mortoni Ponder, 1965". Te Papa. Retrieved 17 November 2022.
  8. ^ "marine snail, Eatoniella mortoni Ponder, 1965". Te Papa. Retrieved 17 November 2022.
  9. ^
    PMID 31288703
  10. . Retrieved 16 November 2022.
  11. .
  12. .
  13. . Retrieved 16 November 2022.
  14. . Retrieved 16 November 2022.