Maybe you can still find this book:  CONCHS, TIBIAS, AND HARPAS.  by  Jerry G.Walls.
Very helpfull with  fotos,  distributionmaps, designs for ID ( Diagrams of ventral patterns )...........
Edit ( Producer ) : T.F.H Â Publication Inc. Ltd. 1980
211 West Sylvania Avenue, PO Box 427, Neptune, NJ 07753
ISBN 0-87666-629-2
<a href="http://openlibrary.org/works/OL787280W/Conchs_Tibias_and_Harps_--_A_Survey_of_the_Molluscan_Families_Strombidae_and_Harpidae" target="_blank"><!-- m --><a class="postlink" href="http://openlibrary.org/works/OL787280W/Conchs_Tibias_and_Harps_--_A_Survey_of_the_Molluscan_Families_Strombidae_and_Harpidae">http://openlibrary.org/works/OL787280W/ ... d_Harpidae</a><!-- m --></a>
<a href="http://www.amazon.com/gp/product/0876666292?tag=openlibr-20" target="_blank"><!-- m --><a class="postlink" href="http://www.amazon.com/gp/product/0876666292?tag=openlibr-20">http://www.amazon.com/gp/product/087666 ... penlibr-20</a><!-- m --></a>
I was wanting to know if there are any different ID markings between <i>H. major</i>, <i>H. davidis</i> and <i>H. articularis</i>. I have looked through countless field guides & without written descrïptions, I can't distinguish between them. Only the listed names give away the species.
What should I look for in case I receive an unknown <i>Harpa</i> that looks most like either of these three species? <img src="images/smiley/confused.gif" alt="" border="0" />
This page maybe helps:
<a href="http://www.casimages.com" target="_blank"><img src="http://nsa14.casimages.com/img/2010/07/16/100716072733540146.jpg" alt="http://nsa14.casimages.com/img/2010/07/16/100716072733540146.jpg" style="border:0" /></a>
Are those the columellar side of <i>Harpas</i> in the diagrams?
Okay thanks! I think this will help a lot! Can I save this pic for future reference?
Just last week there was a discussion on this topic on Conch-L. Â If you would like to review this discussion, which includes an offer of a recent article by the author, go to <a href="http://www.listserv.uga.edu/archives/conch-l.html" target="_blank"><!-- m --><a class="postlink" href="http://www.listserv.uga.edu/archives/conch-l.html">http://www.listserv.uga.edu/archives/conch-l.html</a><!-- m --></a> Â and select July 2010, week 2. There you will find several references to the topic "Those Beautiful Harps", with a dozen or so total messages. Â <span class="petit">--Last edited by Paul Monfils on 2010-07-17 03:13:59 --</span>
Wow, lucky! I'll check it out now!