Argalista nana

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Argalista nana
Argalista nana Finlay, 1930 (AM MA70044-3).jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Colloniidae
Subfamily: Colloniinae
Genus: Argalista
Species:
A. nana
Binomial name
Argalista nana
Finlay, 1930 [1]

Argalista nana is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. [2] [3] [4]

Contents

Description

A. nana reaches a width of 2.5mm and a height of 0.9mm.

(Original description) The shell is very similar to Argalista fluctuata in general appearance, but it is uniformly smaller when adult.

The spiral grooves are the same in arrangement, but they are considerably finer. A rather wide band round the umbilicus is free from spiral grooves in A. fluctuata; in A. nana, this band is much narrower, with the spirals continuing almost up to the perforation.

Perhaps the best distinguishing character is the umbilicus, which in A. nana, is much smaller and almost filled up, appearing much as in Uberella vitrea (Hutton). The colour pattern is much the same as in A. fluctuata. [5]

Distribution

This marine species is endemic to New Zealand. It is found from Three Kings Island to Northland. [6] [7] [8]

References

  1. ↑ Finlay H.J. (1930) Additions to the Recent fauna of New Zealand. No. 3. Transactions and Proceedings of the Royal Society of New Zealand 61: 222-247. (Published 23 August 1930). World Register of Marine Species, Retrieved 2013-02-10.
  2. ↑ Argalista nana Finlay, 1930 . 23 October 2025. Retrieved through: World Register of Marine Species .
  3. ↑ Finlay, H. 1930. Additions to the Recent fauna of New Zealand. No. 3, Transactions of the New Zealand Institute, 61 (p.223).
  4. ↑ Powell, A.W.B. "New Zealand mollusca : marine, land, and freshwater shells". natlib.govt.nz. Retrieved 2025-01-29.
  5. ↑ Finlay, H.J. (1930). "Additions to the Recent fauna of New Zealand. No. 3". Additions to the Recent fauna of New Zealand. No. 3. 61: 223. Retrieved 23 October 2025.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  6. ↑ "NZ Mollusca - Argalista nana". www.mollusca.co.nz. Retrieved 2025-01-29.
  7. ↑ Blom, Wilma M. (2019-12-10). "Fossil and Recent molluscan types in the Auckland War Memorial Museum. Part 3: Gastropoda (Patellogastropoda and Vetigastropoda)". Records of the Auckland Museum. 54: 37–62. doi: 10.32912/ram.2018.54.3 . ISSN   1174-9202.
  8. ↑ 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.


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