Distribution
Thecosomata are most common (in terms of diversity, species richness, and abundance) in the top 25 metres (82 ft) of the ocean, and become rarer the deeper one samples. They migrate vertically from day to night, so the community structure changes on a 24 h cycle; during the day many organisms take refuge at water depths in excess of 100 m. They range from the tropics to the poles.
Every day, they migrate vertically in the water column, following their planktonic prey. At night they hunt at the surface and return to deeper water in the morning.
Read more about this topic: Sea Butterfly
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