Powellisetia comes

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Powellisetia comes
Powellisetia comes (Finlay, 1926) (AM MA70636).jpg
Holotype of Powellisetia comes from Auckland War Memorial Museum
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Family: Rissoidae
Genus: Powellisetia
Species:
P. comes
Binomial name
Powellisetia comes
(Finlay, 1926)
Synonyms [1]
  • Powellia comesFinlay, 1926

Powellisetia comes is an extinct species of marine gastropod mollusc in the family Rissoidae. [1] First described by Harold John Finlay in 1926, it is known to have lived in New Zealand during the early Miocene.

Contents

Description

Finlay described the species as follows:

Shell [subulate, highly polished, milk-white], but smaller, more inflated, and less slender [than Onoba lactea ]. Whorls more convex, with deeper sutures. Peripheral subangle marked by a thread, indications of other spiral threads present. Faint axial plicae on upper whorls. Spire about 1½ times aperture in height, outlines a trifle convex. Outer lip and varix not nearly so crass as in last species, aperture suboval, less emarginate below. Umbilicus about same size, but less prominent, due to absence of encircling blunt angulation and rounder base. Height, 2 mm.; diameter, 1.2 mm. Locality,—[Pukeuri sandy clays (Awamoan, i.e. "Miocene") near Oamaru]. Nearly related to [ Haurakia semireticulata ], but shorter, with weaker peripheral thread and umbilicus. [2]

Distribution

Fossils of the species have only been identified in New Zealand. [1] The holotype was collected from the Mount Harris Formation near Pukeuri, Otago, which dates to the early Miocene era. [3] [4]

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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 comes Finlay, 1933". MolluscaBase. World Register of Marine Species . Retrieved 22 November 2022.
  2. ↑ H. J. Finlay (23 December 1926). "A Further Commentary on New Zealand Molluscan Systematics". Transactions and Proceedings of the New Zealand Institute. 57: 320–485. ISSN   1176-6158. Wikidata   Q96032915.
  3. ↑ Blom, Wilma (2022). "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 . 56 (55): 39–62. doi:10.32912/ram.2020.55.7. ISSN   2422-8567. S2CID   229670783 . Retrieved 20 October 2022.
  4. ↑ "Powellia comes". Auckland War Memorial Museum . Retrieved 23 November 2022.


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