Calliostoma annulatum

Species of gastropod

Jeweled topsnail

Calliostoma annulatum crawling on a kelp leaf
Scientific classification
Kingdom:  |

Animalia

Phylum:  |

Mollusca

Class:  |

Gastropoda

(unranked):  |

clade Vetigastropoda

Superfamily:  |

Trochoidea

Family:  |

Calliostomatidae

Subfamily:  |

Calliostomatinae

Genus:  |

Calliostoma

Species:  |

C. annulatum

Binomial name
Calliostoma annulatum

(Lightfoot, 1786)

Synonyms

* Trochus annulatus Martyn, 1784
* Trochus moniliferus Phil.
* Trochus virgineus Chemnitz
* Zizyphinus annulatus Martyn, Reeve,

Calliostoma annulatum, also known as the purple-ring topsnail, blue-ring topsnail or jeweled topsnail, is a medium-sized sea snail with gills and an operculum.[1]

This is a sublittoral marine gastropod mollusk in the family Calliostomatidae. This snail lives off of the Pacific coast of North America.

## Contents

* 1 Range of distribution
* 2 Shell description
* 3 Life habits
* 4 References
* 5 External links

## Range of distribution[edit]

This top shell can be found in the littoral zone from Isla San Geronimo, Baja California, north to Forrester Island, Alaska.

## Shell description[edit]

The shell height varies between 16 mm and 35 mm. The elevated-conic shell is imperforate and rather thin. This species is distinguished by its brilliantly colored shell, which is lustrous with a gold field, dotted with brown on the spiral rows of grains, the periphery or lower edge of each whorl encircled by a zone of violet or magenta stripes, the axis surrounded by a tract of the same. The brilliance of the colors fades somewhat once the animal dies. The thin shell shows numerous granulose spiral riblets, about 7 on the penultimate whorl, 9 or 10 on the base. It has few or none interstitial lirulae. The acute, reddish apex is minute. The sutures are slightly impressed. There are about 9 whorls, slightly convex, the last angular at periphery, flattened beneath. The rhomboidal aperture is oblique, fluted within. There is no umbilicus.[2] The head and foot of the animal has a yellow-orange color with brown spots. The color of the shell is gold with purple stripes.

## Life habits[edit]

This species is fairly omnivorous, feeding seasonally on kelp, sessile fauna like bryozoans, and detritus.

Two individuals of Calliostoma annulatum are visible on this hydrocoral

## References[edit]

1. ^ Rosenberg, G. (2012). Calliostoma annulatum (Lightfoot, 1786). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=534197 on 2012-12-10
2. ^ Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia

* Integrated Taxonomic Information System. Calliostoma annulatum
* Race Rocks Taxonomy. Calliostoma annulatum
* Key to Invertebrates Found At or Near Walla Walla College Marine Station.
* Turgeon, D.D., et al. 1998. Common and scientific names of aquatic invertebrates of the United States and Canada. American Fisheries Society Special Publication 26 page(s), p. 61
* Calliostoma annulatum

Wikimedia Commons has media related to Calliostoma annulatum.

## External links[edit]

* "Calliostoma annulatum". Gastropods.com. Retrieved 15 January 2019.

Taxon identifiers|

* Wikidata: Q2975880
* BOLD: 395158
* CoL: PRN2
* EoL: 619458
* GBIF: 2293326
* iNaturalist: 121181
* IRMNG: 11342407
* ITIS: 69796
* NCBI: 1842843
* SeaLifeBase: 3004
* WoRMS: 534197

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