†family Placideidae Schneider 1956 (ostracod)
Ostracoda - Palaeocopida - Placideidae
Full reference: G. F. Schneider. 1956. Ostracoda. Materialy po Paleontologii, Novye Semeystva i Rody 87-127
Parent taxon: Kirkbyoidea according to S. Crasquin-Soleau 1997
See also Benson et al. 1961
Sister taxa: Amphissellidae, Amphissitidae, Arcyzonidae, Cardiniferellidae, Iranokirkbya, Kellettinidae, Kirkbyidae, Knightinidae, Parvikirkbyiidae
Subtaxa: Amphissella Placidea
Type: Placidea
Ecology: epifaunal suspension feeder
Distribution:
• Permian of Canada (1: British Columbia collection), Oman (1), the Russian Federation (2)
• Devonian of United States (2: New York)
• Silurian of United States (1: Oklahoma)
Total: 7 collections each including a single occurrence