Drawing of apertural view of the shell of <i>Littorina saxatilis</i>.
Regina L. Cunha, Cristina Grande &amp; Rafael Zardoya
CC BY 2.0
Cunha R. L., Grande C. &amp; Zardoya R. (2009). "Neogastropod phylogenetic relationships based on entire mitochondrial genomes". <i>BMC Evolutionary Biology</i> <b>9</b>:210. <a href="//doi.org/10.1186/1471-2148-9-210" class="extiw" title="doi:10.1186/1471-2148-9-210">doi:10.1186/1471-2148-9-210</a>. <a rel="nofollow" class="external text" href="http://www.biomedcentral.com/1471-2148/9/210/figure/F4">Figure 4</a>.