Powellisetia

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title: "Powellisetia" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["powellisetia", "gastropod-genera", "molluscs-of-the-atlantic-ocean", "molluscs-of-the-indian-ocean", "molluscs-of-the-pacific-ocean", "molluscs-of-the-southern-ocean", "taxa-described-in-1965", "taxa-named-by-winston-ponder"] description: "Genus of gastropods" topic_path: "geography/india" source: "https://en.wikipedia.org/wiki/Powellisetia" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Genus of gastropods ::

| fossil_range = | image = Powellisetia fallax 01.jpg | image_caption = Powellisetia fallax | taxon = Powellisetia | authority = Ponder, 1965 | synonyms_ref = | synonyms = | type_species = Rissoa porcellana | type_species_authority = (Suter, 1908)

Powellisetia is a genus of minute sea snails, marine gastropod mollusks micromollusks in the family Rissoidae. The genus is primarily found in the Southern Hemisphere.

Description

In the original description, Ponder described Powellisetia as follows:

Members of Powellisetia have a thin, horny operculum, which is transparent and ranges from ovate to ear-shaped, typically with two whorla and a wide nucleus. The genus can be distinguished due to having a large initial whorl on the protoconch of the shell, having more ovate shells than Onoba, and either having no teleoconch sculpture, or a sculpture of fine spiral lirae.

Taxonomy

The genus was first described by Winston Ponder in 1965, who named the genus after malacologist A. W. B. Powell, and named Rissoa porcellana (current accepted name Powellisetia porcellana) as the type species. Many species had previously been described as members of Notosetia.

Distribution

Most members of Powellisetia are found in the waters of New Zealand, Australia, Antarctica and sub-Antarctic regions of the world. Fossils of the species date to the Miocene.

Species

Species within the genus Powellisetia include:

• Powellisetia arnaudi Ponder, 1983
• Powellisetia australis (R. B. Watson, 1886)
• Powellisetia bilirata Ponder, 1965
• † Powellisetia comes (H. J. Finlay, 1926)
• Powellisetia crassilabrum (A. W. B. Powell, 1940)
• Powellisetia deserta (E. A. Smith, 1907)
• Powellisetia epulata (Laws, 1941) †
• † Powellisetia europaea Landau, Ceulemans & Van Dingenen, 2018
• Powellisetia fairchildi (A. W. B. Powell, 1933)
• Powellisetia fallax Kay, 1979
• Powellisetia foveauxana (E. C. Smith, 1962)
• Powellisetia gradata (Suter, 1908)
• Powellisetia inornata (Strebel, 1908)
• Powellisetia lineata (E. C. Smith, 1962)
• Powellisetia microlirata Ponder & Worsfold, 1994
• Powellisetia microstriata (Murdoch, 1905)
• † Powellisetia paroeca (H. J. Finlay, 1924)
• Powellisetia pelseneeri (Thiele, 1912)
• Powellisetia philomelae (R. B. Watson, 1886)
• Powellisetia ponderi Numanami, 1996
• Powellisetia porcellana (Suter, 1908)
• Powellisetia porcellanoides (A. W. B. Powell, 1937)
• Powellisetia principis (R. B. Watson, 1886)
• † Powellisetia prisca (H. J. Finlay, 1924)
• Powellisetia retusa (A. W. B. Powell, 1927)
• Powellisetia simillima (May, 1915)
• Powellisetia subcarinata (A. W. B. Powell, 1940)
• Powellisetia subgradata (A. W. B. Powell, 1937)
• Powellisetia subtenuis (A. W. B. Powell, 1937)
• Powellisetia tenuisculpta (A. W. B. Powell, 1933)
• Powellisetia unicarinata (A. W. B. Powell, 1930)
• Powellisetia varicosa Ponder, 1983

;Species brought into synonymy:

• Powellisetia helena (W. H. Turton, 1932): synonym of Microsetia helena W. H. Turton, 1932
• † Powellisetia marshalli Grant-Mackie & Chapman-Smith, 1971: synonym of Haurakia marshalli (Grant-Mackie & Chapman-Smith, 1971)

Gallery

Powellisetia bilirata (Ponder, 1965) (AM MA71265).jpg|Powellisetia bilirata Powellisetia comes (Finlay, 1926) (AM MA70636).jpg|Powellisetia comes Powellisetia paroeca (Finlay, 1924) (AM MA70541).jpg|Powellisetia paroeca Dardanula convexispira MA71223 001.jpg|Powellisetia porcellana Powellisetia unicarinata (Powell, 1930) (AM MA70544).jpg|Powellisetia unicarinata

References

References

1. {{WRMS species. 196976. ''Powellisetia'' Ponder, 1965. 10 November 2025
2. {{Cite Q. Q58676804
3. {{cite Q. Q99966349
4. (1979). "New Zealand Mollusca: Marine, Land and Freshwater Shells". Collins.
5. {{Cite GBIF

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