From Lexicanum

Scataphagoids are beetle-sized organisms that live in the respiratory tracts of Tyranid bio-ships, and are one of the innumerable Tyranid species which make up a Hive Fleet. Scataphagoids fulfil one of the more humble and simple responsibilities in the Tyranid fleets; their purpose being to clean the respiratory tracts and recycle organic material.¹

Sources

• ¹Codex: Tyranids (2nd Edition)

See also

• Species of Tyranid