Monetaria annulus (Linnaeus, C., 1758) from Tunisia? PDF Print E-mail
Written by NC   
Sunday, 03 October 2010 13:24

From Tunisia we receive continuous reports of new alien species, species that have been introduced from other oceans and find the right environment in which grow and reproduce. These alien species are also referred to a certain curiosity and sometimes a signal to researcher about the environmental changes taking place in the Mediterranean Sea.

When i looking Publications for anything else I come across a small note / scientific report published at the following link:


which indicates the presence and the discovery of four specimens of Monetaria annulus (Linnaeus, C., 1758) running in dredging a stretch of sea between the shores of the archipelago Kerkenna North until you get off Tripoli. now say that their presence confirms the presence of the species is too early and find a sporadic but as I report and you should know. Perhaps other researchers / enthusiasts reading these two lines in the near future will also be highlighting the discovery of other specimens, or the lack of other examples relegating this note of curiosity or misjudgment. But whereas the authors state that according to bathymetric features, preservation of the shells and other factors, which places the subject of the discovery have proved already colonized by other alien species, since the area provides a suitable environment for considerations of substrate , temperature, etc. ... a hope that a new species has arrived and environment are not minimal.

We conclude by asking that, if others make findings report it so that we can make a more complete picture of the matter.

Photos taken from http://www.ciesm.org/online/archives/abstracts/pdf/38/PG_00435.pdf all rights and copyrights are therefore of the authors of the publication.

Last Updated on Monday, 15 June 2015 14:42
Gastropoda (Cuvier, 1797) PDF Print E-mail

Gastropods are a class of living mollusks that has maintained a way of life and a structure relatively similar to the common ancestor of the phylum. Include snails (Helix & Limax) and numerous marine animals that are known more for their shells (although a large number of them, including most of the Heterobranchia and all the sea slugs, haven't a shel) .


The most striking change compared to the ancestral mollusc is a lot of guts rotation around an axis vertical and its winding spiral, involving also the shell. Gastropods have therefore lost bilateral symmetry. The foot and head are evident and there are antennas on the head with tactile and / or visual features. Marine gastropods, mostly are benthic, may also have a mass of several kilograms. Terrestrial have evolved a lung in the cavity of the mantle, are in any case confined to damp environments. Both aquatic species, both terrestrial lost their shell.