Hurdiidae

Hurdiidae Temporal range: Cambrian Stage 4–Lower Devonian PreꞒ Ꞓ O S D C P T J K Pg N
Stanleycaris (top left), Hurdia (top right), Aegirocassis (middle), Peytoia (bottom left), Cambroraster (bottom right)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Order:	†Radiodonta
Family:	†Hurdiidae Vinther et al., 2014
Genera
See text

Hurdiidae (synonymous with the previously named Peytoiidae^[1]) is an extinct cosmopolitan family of radiodonts, a group of stem-group arthropods, which lived during the Paleozoic Era. It is the most long-lived radiodont clade, lasting from the Cambrian period to the Devonian period.