A species of colourful sea slug or dorid nudibranch, a marine gastropod mollusk. The species is hermaphroditic, with both male and female organs active at the same time. After mating, the external portion of the penis detaches, but is able to regrow within 24 hours.
intertidal zone, deep sea
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Kaplan, M. Sea slug loses penis after sex but grows another the next day. Nature (2013). https://doi.org/10.1038/nature.2013.12421