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. The most conspicuous character is the wide perforated fringe of the head.
| Trinucleidae Temporal range: | |
|---|---|
| Cryptolithoides ulrichi, 12 mm (0.47 in) | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | †Trilobita |
| Order: | †Asaphida |
| Superfamily: | †Trinucleioidea |
| Family: | †Trinucleidae Hawle & Corda, 1847 |
| Subfamilies | |
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