Order Spionida Rouse and Fauchald 1997 (worm)
Parent taxon: Canalipalpata according to C. J. Glasby et al. 2000
Sister taxa: Polygordiidae, Protodrilidae, Protodriloididae, Sabellida, Saccocirridae
Subtaxa: Apistobranchidae Chaetopteridae Longosomatidae Magelonidae Poecilochaetidae Spionidae Trochochaetidae Uncispionidae
Distribution:
• Quaternary of Italy (1 collection), United States (10: California, North Carolina, Virginia)
• Pliocene of Belgium (1)
• Miocene of Germany (1), United States (5: Maryland, Texas)
• Paleocene of United States (1: Illinois)
• Cretaceous of Germany (1), United States (2: Alabama, Arizona)
• Jurassic of France (1), Portugal (1)
• Cambrian of China (1)
Total: 25 collections each including a single occurrence