Double checking taxonomy of cerithium

[paul monfils]

Here is a comparison of muscarum and stercusmuscarum:

<!-- m --><a class="postlink" href="http://www.conchology.be/?t=65&family=CERITHIIDAE&species=muscarum&locality=">http://www.conchology.be/?t=65&family=C ... &locality=</a><!-- m -->

aluco and vertagus can be seen here (among others):

<!-- m --><a class="postlink" href="http://www.conchology.be/?t=65&family=CERITHIIDAE&species=vertagus&locality=">http://www.conchology.be/?t=65&family=C ... &locality=</a><!-- m -->

I'm not suggesting that this site is the final authority on such matters, though I do find it to be quite reliable.

vertagus and aluco were both named by Linnaeus.  Species named by him are seldom if ever renamed.