Drawing of love dart of <i><a href="//commons.wikimedia.org/wiki/Cernuella_cisalpina" title="Cernuella cisalpina">Cernuella cisalpina</a></i>. Cross-section (on the left) and lateral view (on the right)
Joris M. Koene and Hinrich Schulenburg
CC BY 2.0
<p>cropped from Figure 3 <a rel="nofollow" class="external free" href="http://www.biomedcentral.com/1471-2148/5/25/figure/F3?highres=y">http://www.biomedcentral.com/1471-2148/5/25/figure/F3?highres=y</a> from:<br></p>
Joris M. Koene and Hinrich Schulenburg: <a rel="nofollow" class="external text" href="http://www.biomedcentral.com/1471-2148/5/25">Shooting darts: co-evolution and counter-adaptation in hermaphroditic snails</a>. - BMC Evolutionary Biology, 2005, 5:25 doi:10.1186/1471-2148-5-25.