Planacollonista rosea

Planacollonista rosea
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Colloniidae
Genus:	Planacollonista
Species:	P. rosea
Binomial name
	Planacollonista rosea; (Tenison Woods, 1876)
Synonyms
	Argalista rosea(Tenison Woods, 1876) superseded combination; Monilea roseaTenison Woods, 1876 superseded combination;

Last updated October 28, 2025

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

Description

(Original description) The shell is minute and turbinate (top-shaped), with a widely umbilicate base. Its color is rose, often variegated with white spots. In some specimens, this small shell exhibits an intense carmine color.

It has four rounded whorls which are encircled with alternating large and small white striae (lines or grooves).

The aperture is entire and rounded. The outer lip is produced (extended) very much from the suture, which gives the aperture a sunken appearance. The inner lip is simple. The umbilical margin is furnished with a somewhat inconspicuous white corrugated umbilicus. The callosity at the umbilicus is only perceptible under a lens in very good specimens.^[2]

References

↑ Bouchet P (2023). 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.). "Planacollonista rosea (Tenison Woods, 1876". MolluscaBase. World Register of Marine Species.
↑ Tenison Woods, J.E. (1876). "Descriptions of new Tasmanian shells". Proceedings and Report of the Royal Society of Tasmania. 1875: 154. This article incorporates text from this source, which is in the public domain .

Poppe, G.T., Tagaro, S.P. & Huang, S.-I. (2023). The recent Colloniidae with a study of the Colloniidae collected by various expeditions of the Muséum national d'Histoire naturelle, Paris. Harxheim: ConchBooks. 372 pp.

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[WoRMS-1] Bouchet P (2023). 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.). "Planacollonista rosea (Tenison Woods, 1876". MolluscaBase. World Register of Marine Species.

[2] Tenison Woods, J.E. (1876). "Descriptions of new Tasmanian shells". Proceedings and Report of the Royal Society of Tasmania. 1875: 154. This article incorporates text from this source, which is in the public domain .

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