Eatoniella stewartiana

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Eatoniella stewartiana

Holotype of Eatoniella stewartiana from Auckland War Memorial Museum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Eatoniellidae
Genus:	Eatoniella
Species:	E. stewartiana
Binomial name
*Eatoniella stewartiana* (Ponder, 1965)
Synonyms^[1]
Eatoniella (Eatoniella) stewartiana Ponder 1965

Eatoniella stewartiana is a species of marine gastropod mollusc in the family Eatoniellidae.^[1] First described by Winston Ponder in 1965, it is endemic to the waters of New Zealand.

Description

Eatoniella stewartiana has an evenly retracted outer lip. The shell is purplish black in colour, with a pale grey/transparent protoconch.^[2] The species measures 2mm by 1.15mm.^[3]

The species closely resembles Eatoniella kerguelenensis subsp. chiltoni, but can be differentiated by its smaller sizer, thinner, emi-transparent shell and false margined sutures.^[2]

Distribution

The species is endemic to New Zealand.^[1] The holotype was collected in September 1962 by Elsie Smith on Ocean Beach, Stewart Island, near high tide on Bostrychia red algae.^[4] The species is found in the waters of Stewart Island and the south-east of the South Island, living in algae in most of intertidal zone.^[2] On the West Coast, the species has been recorded as far north as Haast,^[5] and on the east coast as far north as Waikouaiti.^[6] The species appears to replace Eatoniella kerguelenensis subsp. chiltoni in Southland and Stewart Island. Both species overlap in range in the Otago Harbour.^[2]

Fossil evidence has shown that Eatoniella stewartiana was very common on the coastal terraces near modern-day Kaikōura Peninsula during the Pleistocene era.^[7]

References

^ ^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 stewartiana Ponder, 1965". MolluscaBase. World Register of Marine Species. Retrieved 15 November 2022.
^ ^a ^b ^c ^d Ponder, W. F. (1965). "The Family Eatoniellidae in New Zealand". Records of the Auckland Institute and Museum. 6: 47–99. ISSN 0067-0464. JSTOR 42906115. Wikidata Q58676802.
^ "Eatoniella stewartiana". New Zealand Mollusca. Retrieved 20 November 2022.
^ Blom, Wilma M. (2020). "Fossil and Recent molluscan types in the Auckland War Memorial Museum. Part 4: Gastropoda (Caenogastropoda - Neocyclotidae to Epitoniidae). [Cyclophoroidea, Cerithioidea, Littorinimorpha]". Records of the Auckland Museum. 55: 101–150. doi:10.32912/RAM.2020.55.7. ISSN 1174-9202. JSTOR 27008995. S2CID 229670783. Wikidata Q106828489.
^ "marine snail, Eatoniella stewartiana Ponder, 1965". Te Papa. Retrieved 19 November 2022.
^ "marine snail, Eatoniella stewartiana Ponder, 1965". Te Papa. Retrieved 19 November 2022.
^ Ota, Yoko; Pillans, Brad; Berryman, Kelvin; Beu, Alan; Fujimori, Takatoshi; Miyauchi, Takahiro; Berger, Glenn; Beu, A.G.; Climo, F.M. (1 March 1996). "Pleistocene coastal terraces of Kaikoura Peninsula and the Marlborough coast, South Island, New Zealand". New Zealand Journal of Geology and Geophysics. 39 (1): 51–73. Bibcode:1996NZJGG..39...51O. doi:10.1080/00288306.1996.9514694. ISSN 0028-8306. Retrieved 19 November 2022.

Taxon identifiers
Eatoniella stewartiana	Wikidata: Q10478939 CoL: 38BYV EoL: 15764665 GBIF: 2300830 iNaturalist: 388854 IRMNG: 10087540 NZOR: b4aab61d-838e-4ae3-bd50-462a4257b436 OBIS: 598460 Open Tree of Life: 2894299 WoRMS: 598460

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