Comb jellies are the largest animals to have entirely ciliary locomotion and bloody-bellies can grow up to six inches. They also possess eight rows of hair-like cilia, called ctenes, which serve ...

Previously, the immortal jellyfish (Turritopsis dohrnii) was the only species thought to have the ability for reverse development, but now, scientists know that the comb jelly (Mnemiopsis leidyi ...