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:

Ammagnostidae
Temporal range: Cambrian–Ordovician
Scientific classification
Kingdom:
Phylum:
Class:
Order:
Superfamily:
Family:
Ammagnostidae
Genera
Ammagnostus Öpik, 1967
Hadragnostus Öpik, 1967
Kormagnostus Resser, 1938
Proagnostus Butts, 1926

They lived during the late Cambrian period to the Ordovician period.

References

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