Trochus Explained

Trochus is a genus of medium-to large-sized, top-shaped sea snails with an operculum, of the family Trochidae, the top snails.[1]

When the word "trochus" or "Trochus" is used in reference to fishing sea snails for commercial purposes, the usual species targeted is Tectus niloticus, which is valued for its nacre or mother of pearl layer, which was traditionally made into items such as pearl buttons and jewelry. Tectus niloticus is no longer classified as a Trochus species, and it is no longer classified in the family Trochidae; it is now placed in the family Tegulidae.

History

The name Trochus, according to P. Fischer[2] was used for the first time by Guillaume Rondelet, in 1558, who assembled under this title a rather miscellaneous assortment of univalves. Linnaeus' genus Trochus is composed principally of true Trochidae, but it is now viewed as having contained species of several other very different families.

Lamarck further restricted the group, by eliminating several genera; and in the 19th century the labors of Gray, H. Adams and A. Adams and others, contributed towards a more systematic arrangement of the family.[3] Further revisions have narrowed down the number of species in this genus, and most names have become synonyms.

Shell description

Sea snails in the genus Trochus have large, thick, solid shells that have a broadly conical spire and a flat to convex base. The periphery is angulated. The outer and basal lips are smooth within. The columella has a strong fold above, ending in an obtuse tooth below.[3]

The interior of the shell is pearly and iridescent because of a thick layer of nacre (mother of pearl).

Species

Species within the genus Trochus include:

Synonyms

The following species are nomina dubia (names of unknown or doubtful application):
Species inquirenda:

References

Further reading

Notes and References

  1. Bouchet, P.; Gofas, S. (2010). Trochus Linnaeus, 1758. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138598 on 5 December 2012
  2. P. Fischer. Monog. Genre Troque, in Kiener's Coquilles Vivantes, Paris, 1880.
  3. https://archive.org/details/manualofconcholo111tryo Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Trochus".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.