Hurdia is an extinct genus of hurdiid radiodont that lived 505 million years ago during the Cambrian Period. Fossils have been found in North America,...

famous species of radiodonts are the Cambrian taxa Anomalocaris canadensis, Hurdia victoria, Peytoia nathorsti, Titanokorys gainesi, Cambroraster falcatus...

 canadensis had 13 pairs. Oral cones of Anomalocaris (A), Peytoia (B) and Hurdia (C), the former showing unique triradial, tuberculated and wrinkled structures...

to the clade Hurdiidae, and is closely related to the contemporary genus Hurdia. Peytoia contains two named species: Peytoia nathorsti, the type species...

This discovery also found that other hurdiid radiodonts like Peytoia and Hurdia had a dorsal pair of flaps as well. Frontal appendages of Aegirocassis had...

Buccaspinea cooperi Cambroraster falcatus Cordaticaris striatus Hurdia triangulata Hurdia victoria Pahvantia hastata Peytoia nathorsti Peytoia infercambriensis...

with some of the others being Cambroraster, Anomalocaris, Peytoia, and Hurdia. Titanokorys is distinguished from other Burgess Shale radiodonts because...

hurdiid head sclerites is notable, with some genera like Aegirocassis and Hurdia possessing long, pointed sclerites. While others like Cambroraster and Titanokorys...

interpreted as bivalved arthropod, and now considered as head sclerites of Hurdia. Pahvantia is a relatively small radiodont with an estimated length between...

symbrachiata but not Anomalocaris canadensis, Tamisiocaris borealis, or Hurdia victoria. Amplectobeluids could be recognized by frontal appendages with...