TIL that Costasiella kuroshimae are shell-less marine mollusks that indirectly perform photosynthesis despite being animals. They are capable of this through a process called kleptoplasty, in which they retain the chloroplasts from the algae they feed on.

https://en.wikipedia.org/wiki/Costasiella_kuroshimae
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gb2gc1/til_that_costasiella_kuroshimae_are_shellless/