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 psammius <small>Öpik, 1967</small> (Type)
• Ammagnostus bassus <small>(Öpik, 1967)</small>
• Ammagnostus bella <small>Guo & Luo, 1996</small>
• Ammagnostus beltensis <small>(Lochman, 1944)</small>
• Ammagnostus cryptus
• Ammagnostus cylindratus <small>Guo & Luo, 1996</small>
• Ammagnostus duibianensis <small>Lu & Lin, 1989</small>
• Ammagnostus histus
• Ammagnostus hunanensis
• Ammagnostus integriceps <small>Öpik, 1967</small>
• Ammagnostus laiwuensis <small>(Lorenz, 1906)</small>
• Ammagnostus mitis <small>Öpik, 1967</small>
• Ammagnostus sinensis <small>Peng, 1987</small>
• Ammagnostus wangcunensis <small>Peng & Robison</small>

• Hadragnostus las <small>Öpik, 1967</small> (Type)
• Hadragnostus edax <small>Fortey & Rushton, 1976</small>
• Hadragnostus helixensis <small>Jago & Cooper, 2005</small>
• Hadragnostus modestus <small>(Lochman, 1944)</small>

• Kormagnostus simplex <small>Resser, 1938</small> (Type)
• Kormagnostus boltoni <small>Westrop et al., 1996</small>
• Kormagnostus copelandi <small>Westrop et al., 1996</small>
• Kormagnostus flati <small>Pratt, 1992</small>
• Kormagnostus inventus <small>Shergold, 1982</small>
• Kormagnostus minutus <small>(Schrank, 1975)</small>
• Kormagnostus seclusus <small>(Walcott, 1884)</small>

• Proagnostus bulbus <small>Butts, 1926</small> (Type)
• Proagnostus centerensis <small>Resser, 1938</small>
• Proagnostus maryvillensis <small>Resser</small>

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

References

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