# Phacopida

> order of arthropods (fossil)

**Wikidata**: [Q138602](https://www.wikidata.org/wiki/Q138602)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Phacopida)  
**Source**: https://4ort.xyz/entity/phacopida


## References

1. Class Trilobita Walch, 1771
2. Freebase Data Dumps. 2013
3. Encyclopedia of Life
4. Fossilworks
5. Interim Register of Marine and Nonmarine Genera
6. Open Tree of Life reference taxonomy version 3.6