Powellisetia unicarinata is a species of marine gastropod mollusc in the family Rissoidae.[1] First described by Powell in 1930 as Notosetia unicarinata, it is endemic to the waters of New Zealand.
| Powellisetia unicarinata | |
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| Holotype of Powellisetia unicarinata from Auckland War Memorial Museum | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | Rissoidae |
| Genus: | Powellisetia |
| Species: | P. unicarinata
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| Binomial name | |
| Powellisetia unicarinata (Powell, 1930)
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| Synonyms[1] | |
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Taxonomy
editOriginally described as Notosetia unicarinata in 1930 by Powell,[2] the species name was revised as Powellisetia unicarinata in 1965 by Winston Ponder.[3]
Description
editPowellisetia bilirata has a minute, roughly ovate shell with a single strong spiral ridge. It is coloured dull-white.[2] The species measures 1.19mm, by 0.59mm.[4] The species' shell has a reasonably tall spire and a strongly tilted protoconch, and shell width is the major factor that varies between individuals in the species.[3]
The species is similar in appearance to Powellisetia porcellanoides, but can be distinguished by its angled carnate shoulder.[3]
Distribution
editThe species is endemic to New Zealand.[1] The holotype dredged by Powell in 1924, from a depth of 9–11 metres at Tryphena Bay on Great Barrier Island.[5] It is found in the north-east of the North Island,[4] as far north as Manawatāwhi / Three Kings Islands,[6]
References
edit- ^ 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). "Powellisetia unicarinata (Powell, 1930)". MolluscaBase. World Register of Marine Species. Retrieved 22 November 2022.
- ^ a b Powell, A. W. B. (29 November 1930). "New species of New Zealand Mollusca from shallow-water dredgings. Part 2". Transactions and Proceedings of the New Zealand Institute. 61: 536–546. ISSN 1176-6158. Wikidata Q115366176.
- ^ a b c Ponder, W. F. (1965). "A Revision of the New Zealand Recent Species Previously Known as Notosetia Iredale, 1915 (Rissoidae, Gastropoda)". Records of the Auckland Institute and Museum. 6: 101–130. ISSN 0067-0464. JSTOR 42906116. Wikidata Q58676804.
- ^ a b "Powellisetia bilirata". New Zealand Mollusca. Retrieved 22 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, Powellisetia unicarinata (Powell, 1930)". Te Papa. Retrieved 23 November 2022.