''Broeggerolithus'' is a genus of the family

Trinucleidae Trinucleidae is a family of small to average size asaphid trilobites that first occurred at the start of the Ordovician and became extinct at the end of that period. It contains approximately 227 species divided over 51 genera in 5 subfamilies. ...

in the

Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years f ...

periods. It is reported only from Northern Europe.

References

Trinucleidae Fossil taxa described in 1935 Ordovician trilobites of Europe {{Asaphida-stub