This tiny deep-sea worm, known as an acorn worm or Allapasus aurantiacus, has its ovaries outside of its body.
The females of this creature is the only known animal to have external ovaries. The odd worm was observed floating 3000 meters beneath the surface off the coast of California by the remote-operated marine vehicle Tiburon. Researchers say the worms have two "wings"- flaps of skin on the main body along much of its length - attached to either side of their body. Several external ovaries are located in these lateral wings. Scientists say it's unclear how the newly-discovered species reproduce.