Wikipedia

Pisinna rekohuana

Pisinna rekohuana is a species of marine gastropod mollusc in the family Anabathridae.[1] First described by Badwn Powell in 1933 as Estea rekohuana, it is endemic to the waters of New Zealand. There are two subspecies of the gastropod: Pisinna rekohuana rekohuana, primarily found in the south and Pisinna rekohuana lactorubra, primarily found on the north-east coast of the North Island.

Pisinna rekohuana
Holotype of Pisinna rekohuana rekohuana from Auckland War Memorial Museum
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Family: Anabathridae
Genus: Pisinna
Species:
P. rekohuana
Binomial name
Pisinna rekohuana
(Powell, 1933)
Synonyms[1]
  • Estea rekohuana Powell, 1933

Description edit

 
Holotype of the subspecies Pisinna rekohuana lactorubra

Powell described the species as follows:

Shell small, ovate, solid. Whorls 4¾, including low dome-shaped protoconch of 1¾ whorls, which is faintly sculptured with closely spaced spiral striae. The surface of the post-nuclear whorls is smooth, but not polished, and apart from faint, slightly oblique axial growth lines, there is no true sculpture. Spire elevated, bluntly conical, one and a-half times height of aperture. Colour reddish-brown, except for a narrow whitish band immediately below the suture, and the peristome and interior of the aperture, which is more yellowish than reddish-brown. Aperture very large, almost circular. Peristome continuous, much thickened within and clearly marked off from the base by a heavy callus. There is no umbilical chink.[2]

Pisinna rekohuana is similar in appearance to Pisinna minor and Pisinna subfusca, and can be identified by its size (intermediate between the two) and relatively larger aperture.[2]

A subspecies, Pisinna rekohuana lactorubra, was described in 1965 by Winston Ponder, differentiated by its proportionately longer spire and different colour pattern.[3] While Ponder noted a similarity of Pisinna rekohuana lactorubra to Pisinna zosterophila, he believed it was best to classify it as a subspecies of Pisinna rekohuana, due to its distribution and the relationships of forms between the three groups.[3]

The species measures 2.0mm, by 0.9mm,[4] while the subspecies Pisinna rekohuana lactorubra measures 3.2mm by 1.5mm.[5]

Distribution edit

The species is endemic to New Zealand.[1] The holotype was collected by Powell himself in February 1933 at Waitangi, Chatham Islands.[6] It is found around the South Island,[7][8][9] in the waters of the Chatham Islands, commonly at Stewart Island, the Auckland Islands and the Kermadec Islands.[2][10][11][12]

Pisinna rekohuana lactorubra is primarily found to the north-east of North Island under stones in the littoral zone, preferring open coasts.[3] It has been identified on Manawatāwhi / Three Kings Islands,[13] the Manukau Harbour on the west coast of the North Island,[14][15] and the Mahia Peninsula.[16]

Since the subspecies was first described, Pisinna rekohuana rekohuana has been identified as living in the range previously thought to be that of Pisinna rekohuana lactorubra, such as the north-east coast of the North Island,[17][18][19] and the Mahia Peninsula.[20]

References edit

  1. ^ a b c 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). "Pisinna rekohuana Powell, 1933". MolluscaBase. World Register of Marine Species. Retrieved 22 November 2022.
  2. ^ a b c Powell, A. W. B. (1933). "The Marine Mollusca of the Chatham Islands". Records of the Auckland Institute and Museum. 1: 181–208. ISSN 0067-0464. JSTOR 42905950. Wikidata Q58676558.
  3. ^ a b c Ponder, W.F. (1965). "A Revision of the New Zealand Recent and Fossil Species of Estea Iredale, 1915". Records of the Auckland Institute and Museum. 6: 131–159. ISSN 0067-0464. JSTOR 42906117. Wikidata Q58676806.
  4. ^ "Pisinna rekohuana". New Zealand Mollusca. Retrieved 22 November 2022.
  5. ^ "Pisinna rekohuana lactorubra". New Zealand Mollusca. Retrieved 22 November 2022.
  6. ^ "Pisinna rekohuana rekohuana". Auckland War Memorial Museum. Retrieved 22 November 2022.
  7. ^ "Pisinna rekohuana rekohuana". Auckland War Memorial Museum. Retrieved 22 November 2022.
  8. ^ "Pisinna rekohuana rekohuana". Auckland War Memorial Museum. Retrieved 22 November 2022.
  9. ^ "Pisinna rekohuana rekohuana". Auckland War Memorial Museum. Retrieved 22 November 2022.
  10. ^ Dell, RK (1960). "Biological Results of the Chatham Islands 1954 Expedition Part 4: Marine Mollusca" (PDF). New Zealand Department of Scientific and Industrial Research Bulletin. 139 (4). ISSN 2538-1016. Retrieved 22 November 2022.
  11. ^ "Pisinna rekohuana rekohuana". Auckland War Memorial Museum. Retrieved 22 November 2022.
  12. ^ Rainer, S. F. (1981). "Soft-bottom benthic communities in Otago Harbour and Blueskin Bay, New Zealand" (PDF). New Zealand Oceanographic Institute Memoir. 80. Retrieved 22 November 2022.
  13. ^ "marine snail, Pisinna lactorubra (Ponder, 1965)". Te Papa. Retrieved 22 November 2022.
  14. ^ "marine snail, Pisinna lactorubra (Ponder, 1965)". Te Papa. Retrieved 22 November 2022.
  15. ^ "Pisinna rekohuana rekohuana". Auckland War Memorial Museum. Retrieved 22 November 2022.
  16. ^ "marine snail, Pisinna lactorubra (Ponder, 1965)". Te Papa. Retrieved 22 November 2022.
  17. ^ "Pisinna rekohuana rekohuana". Auckland War Memorial Museum. Retrieved 22 November 2022.
  18. ^ Morley, Margaret S.; Hayward, Bruce W. (2009). "Marine Mollusca of Great Barrier Island, New Zealand". Records of the Auckland Museum. 46: 15–51. ISSN 1174-9202. JSTOR 42905906. Wikidata Q58623368.
  19. ^ Morley, Margaret S.; Hayward, Bruce W. (1999). "Inner Shelf Mollusca of the Bay of Islands, New Zealand, and Their Depth Distribution". Records of the Auckland Museum. 36: 119–140. ISSN 1174-9202. JSTOR 42905840. Wikidata Q58623318.
  20. ^ "Pisinna rekohuana rekohuana". Auckland War Memorial Museum. Retrieved 22 November 2022.
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