Ammagnostidae is a family of trilobites in the superfamily Agnostoidea, which is part of the order Agnostida, or small, 2 or 3 segmented trilobites. It has four genera:

Ammagnostus Öpik, 1967

• Ammagnostus psammius Öpik, 1967 (Type)
• Ammagnostus bassus (Öpik, 1967) Guo and Luo, 1996
• Ammagnostus bella Guo and Luo, 1996
• Ammagnostus beltensis (Lochman, 1944) Robinson, 1988
• Ammagnostus cryptus
• Ammagnostus cylindratus Guo and Luo, 1996
• Ammagnostus duibianensis Lu and 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 and Robison

Hadragnostus Öpik, 1967

• Hadragnostus las Öpik, 1967 (Type)
• Hadragnostus edax Fortey and Rushton, 1976
• Hadragnostus helixensis Jago and Cooper, 2005
• Hadragnostus modestus (Lochman, 1944)

Kormagnostus Resser, 1938

• Kormagnostus sinplex 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 occurred during the late Cambrian period to the Ordovician period.

References Edit

• http://www.biolib.cz/en/taxon/id456979/
• http://www.trilobites.info/ordagnostida.htm
  

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