Orbiscollonia variecostata

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Orbiscollonia variecostata
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Colloniidae
Genus: Orbiscollonia
Species:
O. variecostata
Binomial name
Orbiscollonia variecostata
(Powell, 1937)
Synonyms

Argalista variecostataA. W. B. Powell, 1937 superseded combination

Contents

Orbiscollonia variecostata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. [1]

Description

The height of the shell attains 1.8 mm, its diameter 2.3 mm.

(Original description) The small, soli shell is turbinate and umbilicat. It is sculptured with numerous closely spaced spiral cords, and three spiral keels. The shell contains 3½ whorls, includinga minute smooth slightly convex protoconch of one whorl. The spire measures about two-thirds the height of the aperture. The umbilicus is open, deep, about one-sixth the diameter of base. Its edge is fairly sharp and is crenulated by short axial folds. Only two of the spiral keels show on the spire whorls, the third being just below the suture; they are equispaced, rather widely over the middle of the body whorl. The finer spiral cords on the body whorl number nine between the suture and the uppermost keel, followed by eight both between keels 1 and 2 and keels 2 and 3, and finally ten from the lowest keel to the umbilicus. The rounded aperture is typical. The colour of the holotype is pale pink with very small irregular patches of light brown. The peristome and the interior of the apertureare white. Some paratypes have the ground colour buff. [2]

Distribution

This marine species is endemic to New Zealand off Three Kings Island.

References

  1. MolluscaBase eds. (2025). MolluscaBase. Orbiscollonia variecostata (A. W. B. Powell, 1937). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1640570 on 2025-10-09
  2. Powell, A.W.B. (1937). "New species of marine Mollusca from New Zealand". Discovery Reports. 15: 188. Retrieved 27 October 2025.PD-icon.svg This article incorporates text from this source, which is in the public domain .