Agnostid
| Agnostidae Temporal range: Middle Cambrian – Middle Ordovician, 508–460 Ma |
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| Agnostus pisiformis | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Trilobita |
| Order: | Agnostida |
| Suborder: | Agnostina |
| Superfamily: | Agnostoidea |
| Family: |
Agnostidae McCoy, 1849 |
| Synonyms | |
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Micragnostidae Howell, 1935, Glyptagnostidae Whitehouse, 1936, Rudagnostidae Lermontova, 1951 |
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Micragnostidae Howell, 1935, Glyptagnostidae Whitehouse, 1936, Rudagnostidae Lermontova, 1951
Agnostidae is a family of Agnostida trilobites. Like all Agnostina, they were eyeless and only bore two thoracic segments. They ranged in benthic waters across the globe from 508 to 461 million years ago, containing the following genera, among others:
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