Where do cephalochordates live?

Cephalochordates, also known as lancelets or amphioxus, are small, fishlike marine invertebrates.

While they develop in open water during their early stages, adult cephalochordates typically live in marine environments where they remain partially or entirely buried in sand and gravel on the ocean floor. As filter feeders, this habitat allows them to maintain their relatively simple, sedentary lifestyle while accessing nutrients from the surrounding water.12