- Balanoglossus belongs to the phylum Hemichordata in the animal kingdom.

- Hemichordates are a small group of marine organisms that share some characteristics with both chordates and invertebrates. They are part of the deuterostome lineage, which also includes echinoderms and chordates.

- Balanoglossus, also known as acorn worms, is a type of hemichordate.

- These organisms are found in marine environments, living in burrows or on the seabed. While they are not as well-known as some other marine animals, they are of interest to biologists studying the evolution of chordates and the early stages of vertebrate development.