Radiodonta
| Radiodonta Temporal range: Cambrian Stage 3 - Early Devonian, 521–400 Ma |
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| Peytoia nathorsti | |
| Scientific classification | |
| Kingdom: | Animalia |
| Class: | †Dinocaridida |
| Order: |
†Radiodonta Collins, 1996 |
| Subgroups | |
Radiodonta is a clade of stem-group arthropods that was successful worldwide during the Cambrian period, and included the earliest large predators known. Some of the most famous species included in Radiodonta are the Cambrian taxa Anomalocaris canadensis, Hurdia victoria, and Peytoia nathorsti, the Ordovician Aegirocassis benmoulai and the Devonian Schinderhannes bartelsi.
The name Radiodonta refers to the radial arrangement of tooth plates surrounding the mouth.
In 2014, the clade Radiodonta was defined as the most inclusive clade including Anomalocaris canadensis but not Paralithodes camtschaticus.
Traditionally, all taxa currently included within Radiodonta have been placed within one family, Anomalocarididae. The original description of the order Radiodonta included Anomalocaris, Laggania, Hurdia, Proboscicaris, Cassubia, Amplectobelua, Cucumericrus, and Parapeytoia.Proboscicaris is now regarded as a junior synonym of Hurdia, and Parapeytoia is considered to be a megacheiran. The phylogenetic position of Cucumericrus is unclear, as it is in a polytomy with Radiodonta and Euarthropoda and thus may belong to either or neither.
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