Trinucleioidea
| Trinucleioidea Temporal range: | |
|---|---|
| Cryptolithoides ulrichi, a trilobite in the family Trinucleidae | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | †Trilobita |
| Order: | †Asaphida |
| Superfamily: | †Trinucleioidea |
| Families | |
Trinucleioidea is a superfamily of trilobites. Traditionally placed within the Asaphida, it is now sometimes considered its own order, Trinucleida.