Ammagnostidae

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

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 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 lived during the late Cambrian period to the Ordovician period.

References