![Cirri and penis of Cantellius alveoporae sp. nov. (MADBK 420501_001),... | Download Scientific Diagram Cirri and penis of Cantellius alveoporae sp. nov. (MADBK 420501_001),... | Download Scientific Diagram](https://www.researchgate.net/publication/351219503/figure/fig4/AS:1018823310315522@1619917814515/Cirri-and-penis-of-Cantellius-alveoporae-sp-nov-MADBK-420501-001-holotype-A.jpg)
Cirri and penis of Cantellius alveoporae sp. nov. (MADBK 420501_001),... | Download Scientific Diagram
![Acorn barnacles have the longest penises (relative to body size) of any animal - they can extend to over 6 times the length of the body. Adults are hermaphrodites but they can't Acorn barnacles have the longest penises (relative to body size) of any animal - they can extend to over 6 times the length of the body. Adults are hermaphrodites but they can't](https://external-preview.redd.it/afOizlPMjNh3HZvcpYc6EFqk2U68325UAYntfcWpc5M.png?width=640&crop=smart&format=pjpg&auto=webp&s=d24e8fd7cc541a8189f2eefac12e4dd753ad7d0a)
Acorn barnacles have the longest penises (relative to body size) of any animal - they can extend to over 6 times the length of the body. Adults are hermaphrodites but they can't
![1 Reproductive behaviour of barnacles. In some species the penis length... | Download Scientific Diagram 1 Reproductive behaviour of barnacles. In some species the penis length... | Download Scientific Diagram](https://www.researchgate.net/publication/282700669/figure/fig1/AS:395312012251136@1471261136246/Reproductive-behaviour-of-barnacles-In-some-species-the-penis-length-of-barnacles-can.png)
1 Reproductive behaviour of barnacles. In some species the penis length... | Download Scientific Diagram
![Maris Wicks on Twitter: "#mermay : barnacle edition: part two Fun fact: Barnacles have the largest penis to body size ratio in the animal kingdom. https://t.co/qPODnwSRkL" / Twitter Maris Wicks on Twitter: "#mermay : barnacle edition: part two Fun fact: Barnacles have the largest penis to body size ratio in the animal kingdom. https://t.co/qPODnwSRkL" / Twitter](https://pbs.twimg.com/media/DeiU8kIXkAArjzJ.jpg:large)
Maris Wicks on Twitter: "#mermay : barnacle edition: part two Fun fact: Barnacles have the largest penis to body size ratio in the animal kingdom. https://t.co/qPODnwSRkL" / Twitter
![Precisely proportioned: intertidal barnacles alter penis form to suit coastal wave action | Proceedings of the Royal Society B: Biological Sciences Precisely proportioned: intertidal barnacles alter penis form to suit coastal wave action | Proceedings of the Royal Society B: Biological Sciences](https://royalsocietypublishing.org/cms/asset/6142997a-4450-4d8f-a94b-0b5e8e1e0297/1081fig3.jpg)