Calliostoma eximium

Calliostoma eximium
Apertural view of a shell of Calliostoma eximium
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Vetigastropoda
Superfamily: Trochoidea
Family: Calliostomatidae
Genus: Calliostoma
Species: C. eximium
Binomial name
Calliostoma eximium
(Reeve, 1843)
Synonyms
  • Trochus ceratus Fischer
  • Trochus eximius Reeve, 1842
  • Trochus versicolor Menke
  • Zizyphinus eximius Reeve, 1863

Calliostoma eximium is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.[1][2]

Description

The height of the conical shell varies between 15 mm and 25 mm. It is imperforate, rather solid and strong. It is light yellowish or grayish, with irregular bluish-black longitudinal maculations and streaks. The base of the shell is dotted or shows small maculations. The shell is sometimes without dark flames, their place taken by obscure brownish clouding. The larger spiral cords both above and below are articulated with deep red. There are about 8 whorls, each one more or less markedly biangular at the circumference. The lower angle is obtuse, concealed by the suture on the spire. The upper angle is acute, continuing nearly to the apex. The whorls are concave above, slightly excavated around the periphery, a little convex beneath. They are encircled by numerous unequal spiral threads, the larger ones beaded, the smaller irregularly crenated by rather decided incremental striae. The base of the shell is radiately striate, with about 8 to 12 smooth spirals, their interstices without secondary riblets. The oblique aperture is rhomboidal. The smooth columella is heavy. Its face is concave, and obtusely subdentate at its base.[3]

Distribution

This species occurs in the Pacific Ocean from Baja California to Peru.

References

  1. ↑ WoRMS (2012). Calliostoma eximium (Reeve, 1843). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=574898 on 2012-12-07
  2. ↑ Keen M. (1971) Sea shells of tropical West America. Marine mollusks from Baja California to Perú, ed. 2. Stanford University Press. 1064 pp.
  3. ↑ Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
Wikimedia Commons has media related to Calliostoma eximium.
This article is issued from Wikipedia - version of the 11/23/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.