But our understanding of the deep-sea trematode’s life cycle ends with the zoarcid. So it’s unsurprising that no one has ever figured out the complete life cycle of any deep-sea trematode. And on that fateful day when the snail’s life ends, the rest of the trematode’s life begins. Gabriel AlcalaDykman deciphered her first trematode life cycle in Santa Barbara in the spring of 2016, while she was an undergrad in Kuris’s parasitology lab. It’s not just that the worms maintain their ludicrously complicated life cycle in a rare oasis of life in one of the most hostile regions on Earth.