<i>Cercaria bucephalus</i> <small>(Ercolani)</small> / <i>Gasterostomum fimbriatum</i> <small>(Siebold)</small> =? <i><a href="//commons.wikimedia.org/w/index.php?title=Category:Bucephalus_polymorphus&amp;action=edit&amp;redlink=1" class="new" title="Category:Bucephalus polymorphus (page does not exist)">Bucephalus polymorphus</a></i> <small>Baer, 1827</small>, cercaria larva from above
<bdi><a href="https://en.wikipedia.org/wiki/en:Ernst_Haeckel" class="extiw" title="w:en:Ernst Haeckel"><span title="German biologist, naturalist, philosopher, physician, and artist (1834-1919)">Ernst Haeckel</span></a>
</bdi>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Haeckel_Platodes.jpg" title="File:Haeckel Platodes.jpg">Haeckel_Platodes.jpg</a></li></ul>