page_title: Radiodonta
section_title: Description
hierarchical_section_title: Radiodonta / Description
caption_attribution_description: English: Reconstruction of Lyrarapax unguispinus, a cambrian radiodont (dinocaridid、stem-group arthropod) 日本語: カンブリア紀に生息したアノマロカリス類（Dinocaridida類、基盤的な節足動物）の1種ライララパクス・ウングイスピヌス Lyrarapax unguispinus の復元図。 References 参考文献: Brain structure resolves the segmental affinity of anomalocaridid appendages (September 2014) Origin of raptorial feeding in juvenile euarthropods revealed by a Cambrian radiodontan (June 2018) Overall reconstruction. A new hurdiid radiodont from the Burgess Shale evinces the exploitation of Cambrian infaunal food sources (July 2019) Position of H-element and P-elements.
context_page_description: Radiodonta is an order of stem-group arthropods that was successful worldwide during the Cambrian period, and included the earliest large predators known. They may be referred to as radiodonts, radiodontans, radiodontids, anomalocarids, or anomalocaridids, although the latter originally refer to the family Anomalocarididae, which previously included all but recently only a few species of this order. Some of the most famous species of radiodonts are the Cambrian taxa Anomalocaris canadensis, Hurdia victoria, Peytoia nathorsti, and Amplectobelua symbrachiata, the Ordovician Aegirocassis benmoulai and the Devonian Schinderhannes bartelsi.
context_section_description: Most radiodonts are significantly large compared to other Cambrian fauna, with body length usually ranging between 30 and 50 centimeters. The largest described radiodont being the Ordovician Aegirocassis benmoulai, which may have grown up to 2 meters long. The 8 centimeters Lyrarapax are one of the smallest radiodonts, with juvenile of L. unguispinus measured only about 18 milimeters. 
  The body of a radiodont could be divided into two regions: head and trunk. The head is composed of only one body segment known as ocular somite, covered by sclerites (head carapace complex), bore arthropodized frontal appendages, ventral mouthparts (oral cone), and stalked compound eyes. While the tapering trunk is composed of multiple body segments, each associated with pairs of flaps and gill-like structures (setal blades).
caption: Reconstruction of Lyrarapax unguispinus. One of the smallest radiodonts.
exif: {}