Biology:Pupatonia gracilispira
| Pupatonia gracilispira | |
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| Holotype of Pupatonia gracilispira from Auckland War Memorial Museum | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | Eatoniellidae |
| Genus: | Pupatonia |
| Species: | P. gracilispira
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| Binomial name | |
| Pupatonia gracilispira (Powell, 1933)
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| Synonyms[1] | |
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Pupatonia gracilispira is a species of marine gastropod mollusc in the family Eatoniellidae.[1] First described by Baden Powell in 1933 as Estea gracilispira, it is endemic to the waters of New Zealand.
Description
Powell described the species as follows:
Shell minute, elongate-oval, semi-transparent, white, polished, thin and fragile. Whorls 4½, including low dome-shaped smooth protoconch, which is not clearly marked off from the post-nuclear whorls. Apart from very faint obliquely retractive growth striae there is no sculpture, the surface of all whorls being smooth and glossy. The suture is false-margined by the base of the preceding whorl showing through. Spire tali, 1½ times height of aperture. Aperture almost circular. Peristome continuous, dilated slightly over the basal and columellar portions and adnate across parietal wall as a distinct connecting callus. In profile the outer lip is straight with the axis of the whorls. There is no true umbilical chink, but there is a slight cavity owing to the overhanging nature of the columellar lip.[2]
Pupatonia gracilispira measures 1.1mm, by 0.525mm.[3] The species is similar in appearance to Pupatonia mimitula, but differs by having a narrower spire, and by having a smooth and polished texture.[4]
Distribution
The species is endemic to New Zealand.[1] The holotype and four paratypes were collected by either Powell himself or by C. A. Fleming in February 1933, from a depth of 18 metres off Owenga Beach in the Chatham Islands.[5] The species has almost exclusively been identified in the Chatham Islands,[6] however has also been identified at Waipapa Point in the south of the South Island,[7] and the Auckland Islands.[8]
References
- ↑ 1.0 1.1 1.2 "Pupatonia gracilispira Powell, 1933". MolluscaBase. World Register of Marine Species. 2022. http://www.marinespecies.org/aphia.php?p=taxdetails&id=598472.
- ↑ , Wikidata Q58676558
- ↑ "Pupatonia gracilispira". http://www.mollusca.co.nz/speciesdetail.php?taxa=2829.
- ↑ , Wikidata Q58676802
- ↑ 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.
- ↑ Dell, RK (1960). "Biological Results of the Chatham Islands 1954 Expedition Part 4: Marine Mollusca". New Zealand Department of Scientific and Industrial Research Bulletin 139 (4). ISSN 2538-1016. https://docs.niwa.co.nz/library/public/Memoir%20007_Biological%20results%20of%20the%20Chatham%20Islands%201954%20expedition%20(Part%204)%20-%201960.pdf. Retrieved 22 November 2022.
- ↑ "Pupatonia gracilispira (Powell, 1933)". Te Papa. https://collections.tepapa.govt.nz/object/1254791.
- ↑ "Pupatonia gracilispira (Powell, 1933)". Te Papa. https://collections.tepapa.govt.nz/object/947803.
Wikidata ☰ Q6783458 entry
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