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Temporal range: Middle Cambrian – Middle Ordovician, 508–460 Ma
Agnostus pisiformis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Trilobita
Order: Agnostida
Suborder: Agnostina
Superfamily: Agnostoidea
Family: Agnostidae
McCoy, 1849

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:[1][2]


  1. ^ S. M. Gon III. "Order Agnostida". Archived from the original on 6 January 2011. Retrieved January 6, 2011. 
  2. ^ Paleobiology Database. "PBDB: Agnostidae". Retrieved December 4, 2011.