Powellisetia unicarinata

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Powellisetia unicarinata
Powellisetia unicarinata (Powell, 1930) (AM MA70544).jpg
Holotype of Powellisetia unicarinata from Auckland War Memorial Museum
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Family: Rissoidae
Genus: Powellisetia
Species:
P. unicarinata
Binomial name
Powellisetia unicarinata
(Powell, 1930)
Synonyms [1]
  • Notosetia unicarinataPowell, 1930

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.

Contents

Description

Powellisetia bilirata has a minute, roughly ovate shell with a single strong spiral ridge. It is coloured dull-white, [2] has a strongly carinated shoulder, and weak angulation found in the lower body whorl. [3] The species measures {{cvt|1.19|mm||, by 0.59 mm (0.023 in). [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. [5]

The species is similar in appearance to Powellisetia porcellanoides , but can be distinguished by its angled carnate shoulder. [5]

Taxonomy

Originally described as Notosetia unicarinata in 1930 by Powell, [2] the species name was revised as Powellisetia unicarinata in 1965 by Winston Ponder. [5]

Distribution

The 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. [6] It is found in the north-east of the North Island, [4] as far north as Manawatāwhi / Three Kings Islands, [7]

References

  1. 1 2 3 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.
  2. 1 2 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.
  3. ↑ Powell, A.W.B. (1979). New Zealand Mollusca: Marine, Land and Freshwater Shells. Auckland: Collins. p. 99. ISBN   0002169061.
  4. 1 2 "Powellisetia bilirata". New Zealand Mollusca. Retrieved 22 November 2022.
  5. 1 2 3 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.
  6. ↑ 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]". Papahou: Records of the Auckland Museum . 55: 101–150. doi:10.32912/RAM.2020.55.7. ISSN   1174-9202. JSTOR   27008995. S2CID   229670783. Wikidata   Q106828489.
  7. ↑ "marine snail, Powellisetia unicarinata (Powell, 1930)". Te Papa . Retrieved 23 November 2022.
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