After Whittington, Chang, Dean, Fortey, Jell, Laurie, Palmer, Repina, Rushton & Shergold, 1997
<==o †Agnostidae M'Coy, 1849 [Micragnostidae Howell, 1935; Glyptagnostidae Whitehouse, 1936; Rudagnostidae Lermontova, 1951] |?-o †Acmarhacis Resser, 1938 [Cyclagnostus Lermontova, 1940; Wanagnostus Qiu in Qiu et al., 1983]; U. Camb. NA. Aust. CAs. EAs. | |-- †A. typicalis Resser, 1938 | |-- †A. elegans (Lermontova, 1940) | `-- †A. anhuiensis (Qiu in Qiu et al., 1983) |?-o †Aistagnostus Xiang & Zhang, 1985; U. Camb. EAs. [possibly an agnostine] | `-- †A. laevigatus Xiang & Zhang, 1985 |?-o †Connagnostus Öpik, 1967; U. Camb. Aust. Na. CAs. [possibly an ammaghostine or a diplagnostid] | `-- †C. venerabilis Öpik, 1967 |?-o ?†Idolagnostus Öpik, 1967; U. Camb. Aust. EAs. | `-- †I. agrestis Öpik, 1967 |?-o †Quadrahomagnostus Chu, 1959; U. Camb. EAs. | `-- †Q. subquadratus Chu, 1959 [Homagnostus (Quadrahomagnostus) subquadratus Chu, 1959] |-- †Agnostinae M'Coy, 1849 |-- †Ammaghostinae Öpik, 1967 `-- †Glyptagnostinae Whitehouse, 1936
Reference(s):
- Whittington, H. B., Chang, W. T., Dean, W. T., Fortey, R. A., Jell, P. A., Laurie, J. R., Palmer, A. R., Repina, L. N., Rushton, A. W. A. & Shergold, J. H., 1997: Systematic Description of the class Trilobita. 331-481.
in Kaesler, R. L., (eds.) 1997: Treatise on Invertebrate Paleontology, Part O, Arthropoda 1, Trilobita, Revisited, vol 1: Introduction, Order Agnostida; Order Redlichiida.
–The Geological Society of America, Inc. and The University of Kansas, Boulder, Colorado & Lawrence, Kansas, 1997, xxiv-530