From: a biology nerd and friends.
“The permanent display at the Shima Marineland Aquarium in the town of Shima includes a 96-tentacled Common Octopus (Octopus vulgaris) that weighed 3.3 kilograms (about 7 lbs) and measured 90 centimeters (3 ft) long when it was captured in nearby Matoya Bay in December 1998. Before dying 5 months later, the creature laid eggs, making it the first known extra-tentacled octopus to do so in captivity. All the baby octopi hatched with the normal number of tentacles, but unfortunately they only survived a month.”
The rarely photographed blanket octopus (from Ellen Prager’s Sex, Drugs, and Sea Slime: The Ocean’s Oddest Creatures and Why They Matter)—
When the male passes a package of sperm to the female, he also self amputates his arm and passes that along, as well—um, talk about self sacrifice (photo courtesy of Steve Hamedl).