Biology:Powellisetia unicarinata
| Powellisetia unicarinata | |
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_(AM_MA70544).jpg)
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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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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.
Taxonomy
Originally described as Notosetia unicarinata in 1930 by Powell,[2] the species name was revised as Powellisetia unicarinata in 1965 by Winston Ponder.[3]
Description
Powellisetia 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
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..[5] It is found in the north-east of the North Island,[4] as far north as Manawatāwhi / Three Kings Islands,[6]
References
- ↑ 1.0 1.1 1.2 "Powellisetia unicarinata (Powell, 1930)". MolluscaBase. World Register of Marine Species. 2022. http://www.marinespecies.org/aphia.php?p=taxdetails&id=565307.
- ↑ 2.0 2.1 , Wikidata Q115366176
- ↑ 3.0 3.1 3.2 , Wikidata Q58676804
- ↑ 4.0 4.1 "Powellisetia bilirata". http://www.mollusca.co.nz/speciesdetail.php?taxa=2974.
- ↑ 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. https://www.aucklandmuseum.com/getmedia/3c274c3f-ff0c-4aa3-8467-bb5ae02261d6/ram_2020_blom. Retrieved 20 October 2022.
- ↑ "marine snail, Powellisetia unicarinata (Powell, 1930)". Te Papa. https://collections.tepapa.govt.nz/object/394377.
Wikidata ☰ Q6777011 entry
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