Mating behaviour in the sea slug (Opisthobranchia, Sacoglossa): hypodermic injection, sperm transfer and balanced reciprocity-8

<p><b>Copyright information:</b></p><p>Taken from "Mating behaviour in the sea slug (Opisthobranchia, Sacoglossa): hypodermic injection, sperm transfer and balanced reciprocity"</p><p>http://www.frontiersinzoology.com/content/4/1/17</p><p>Frontiers in Zoology 2007;4():17-17.</p><p>Published online 4 Jul 2007</p><p>PMCID:PMC1934903.</p><p></p>ng End of circling Sperm transfer into female aperture. Drawings by V. Schmitt from video recordings