| Ammagnostidae Temporal range:
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | †Trilobita (?) |
| Order: | †Agnostida |
| Suborder: | †Agnostina |
| Superfamily: | †Agnostoidea |
| Family: | †Ammagnostidae Opik, 1967 |
| Genera | |
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Ammagnostidae is a family of trilobites in the suborder Agnostina, small, eyeless, isopygous trilobites with a thorax consisting of 2 segments only. Four genera have been assigned to it:
- Ammagnostus Öpik, 1967
- Ammagnostus psammius Öpik, 1967 (Type)
- Ammagnostus bassus (Öpik, 1967)
- Ammagnostus bella Guo & Luo, 1996
- Ammagnostus beltensis (Lochman, 1944)
- Ammagnostus cryptus
- Ammagnostus cylindratus Guo & Luo, 1996
- Ammagnostus duibianensis Lu & Lin, 1989
- Ammagnostus histus
- Ammagnostus hunanensis
- Ammagnostus integriceps Öpik, 1967
- Ammagnostus laiwuensis (Lorenz, 1906)
- Ammagnostus mitis Öpik, 1967
- Ammagnostus sinensis Peng, 1987
- Ammagnostus wangcunensis Peng & Robison
- Hadragnostus Öpik, 1967
- Hadragnostus las Öpik, 1967 (Type)
- Hadragnostus edax Fortey & Rushton, 1976
- Hadragnostus helixensis Jago & Cooper, 2005
- Hadragnostus modestus (Lochman, 1944)
- Kormagnostus Resser, 1938
- Kormagnostus simplex Resser, 1938 (Type)
- Kormagnostus boltoni Westrop et al., 1996
- Kormagnostus copelandi Westrop et al., 1996
- Kormagnostus flati Pratt, 1992
- Kormagnostus inventus Shergold, 1982
- Kormagnostus minutus (Schrank, 1975)
- Kormagnostus seclusus (Walcott, 1884)
- Proagnostus Butts, 1926
- Proagnostus bulbus Butts, 1926 (Type)
- Proagnostus centerensis Resser, 1938
- Proagnostus maryvillensis Resser
They lived during the late Cambrian period to the Ordovician period.