Radiodonta

Radiodonta; Temporal range: Cambrian Stage 3 – Early Devonian,
	Left to right, top to bottom: Amplectobelua symbrachiata, Anomalocaris canadensis, Aegirocassis benmoulai, Peytoia nathorsti, Lyrarapax unguispinus, Cambroraster falcatus, and Hurdia victoria
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Dinocaridida
Order:	†Radiodonta; Collins, 1996
Families
	†Anomalocarididae; †Amplectobeluidae; †Tamisiocarididae; †Hurdiidae; Genera with uncertain classification †Caryosyntrips?; †Cucumericrus?; †Houcaris; †Innovatiocaris; †Laminacaris; †Paranomalocaris; ;

Radiodonta is an extinct order of stem-group arthropods that was successful worldwide during the Cambrian period. They may be referred to as radiodonts, radiodontans, radiodontids, anomalocarids, or anomalocaridids, although the last two originally refer to the family Anomalocarididae, which previously included all species of this order but is now restricted to only a few species. Radiodonts are distinguished by their distinctive frontal appendages, which are morphologically diverse and used for a variety of functions. Radiodonts included the earliest large predators known, but they also included sediment sifters and filter feeders. Some of the most famous species of radiodonts are the Cambrian taxa Anomalocaris canadensis, Hurdia victoria, Peytoia nathorsti, Titanokorys gainessii, Cambroraster falcatus and Amplectobelua symbrachiata, the Ordovician Aegirocassis benmoulai and the Devonian Schinderhannes bartelsi.

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