Researchers named the newfound species Tripedalia maipoensis, after Mai Po Nature Reserve in Hong Kong, where they discovered the transparent critter.
A single-cell parasite relies on two genes that boost each other's activity to switch into "defense mode" when attacked by the immune system.
The sisters were separated at birth due to medical complications, and they remained apart for more than two years after one was rejected by the mother.
A new paper based on long-lost documents confirms that DNA discoverer Rosalind Franklin should be credited for discovering the double helix.