Sidneyia

Sidneyia Temporal range: Cambrian Stage 3–Wuliuan PreꞒ Ꞓ O S D C P T J K Pg N
Reconstruction of Sidneyia minor
Fossil of S. inexpectans
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
(unranked):	†Artiopoda
(unranked):	†Vicissicaudata
Genus:	†Sidneyia Walcott, 1911
Type species
†Sidneyia inexpectans Walcott, 1911
Species
†S. inexpectans Walcott, 1911 †S. minor Du et al., 2023 †S. malongensis Zhu et al., 2023

Sidneyia is an extinct arthropod known from fossils found from the Early to the Mid Cambrian of China and the Mid Cambrian Burgess Shale of British Columbia, Canada.