Scanning electron microscopic (SEM) images love-dart of <i><a href="//commons.wikimedia.org/wiki/Chilostoma_cingulatum" title="Chilostoma cingulatum">Chilostoma cingulatum</a></i>. Upper image is love dart from side view while the measure is 500 μm (0.5 mm). Lower image is cross-section while the measure is 50 μm.
Joris M. Koene and Hinrich Schulenburg
CC BY 2.0
<p>cropped from Figure 2 <a rel="nofollow" class="external free" href="http://www.biomedcentral.com/1471-2148/5/25/figure/F2?highres=y">http://www.biomedcentral.com/1471-2148/5/25/figure/F2?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.