After Hou & Bergström, 1997
<==o †Conciliterga Hou & Bergström, 1997 `--o †Helmatiida Novozhilov, 1969 [Helmetida Simonetta & Delle Cave, 1975] |--o †Helmitiidae Simonetta & Delle Cave, 1975 | |--o †Helmetia Walcott, 1912 | | |?- †H.? fastigata Chlupáè & Kordule, 2002 | | `-- †H. expensa Walcott, 1912 | |--o †Kuamaia Hou, 1987b | | |-- †K. lata Hou, 1987b | | `-- †K. muricata Hou & Bergström, 1997 | `-- †Rhombicalvaria acantha Hou, 1987b `--+-- †Skioldia aldna Hou & Bergström, 1997 [Skioldiidae Hou & Bergström, 1997] `--+-- †Saperion glumaceum Hou, Ramsköld & Bergström, 1991 [Saperiidae Hou & Bergström, 1997] `--o †Tegopeltidae Simonetta & Delle Cave, 1975 |-- †Tegopelte gigas Simonetta & Delle Cave, 1975 `?- †Tontoia kwaguntensis
Reference(s):
- Edgecombe, G. D. & Ramsköld, L., 1999: Relationships of Cambrian Arachnata and the systematic position of Trilobita.
–Journal of Paleontology: Vol. 73, #2, pp. 263-287 - Hou X. & Bergström, J., 1997: Arthropods of the Lower Cambrian Chengjiang fauna, southwest China.
–Fossils & Strata, Number 45, 22nd December 1997, pp. 1-116 - Chlupáè, I. & Kordule, V., 2002: Arthropods of Burgess Shale type from the Middle Cambrian of Bohemia (Czech Republic).
–Bulletin of the Czech Geological Survey: Vol. 77, #3, pp. 167-182 [link]