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The enteropneust, also known as an acorn worm, lurks at the bottom of the Sirena Canyon.

The two acorn worms whose genomes are described here represent the two main enteropneust lineages, separated by at least 370 million years and differing in their developmental modes.

En′tera; Enterop′athy, disease of the intestines; Enteropneust′a, a class of worm-like animals, having the paired respiratory pouches opening from the front part of the alimentary canal; Enterot′omy, dissection or incision of the intestines.

The north-west plains were the home of deep-sea enteropneust acorn worms.

The differentiation of these two parts of the gut in the Enteropneust is just the same as in all the Tunicates and Vertebrates.