Ammagnostidae
# Ammagnostidae

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.

