Alternative spelling: Eodiscida
Full reference: T. Kobayashi. 1939. On the agnostids (Pt. 1). Journal of the Faculty of Science, Imperial University of Tokyo, Section II, Geology, Mineralogy, Geography, Seismology 5:69-198
Parent taxon: Agnostida according to J. Moysiuk and J.-B. Caron 2019
See also Adrain 2011, Palmer and Gatehouse 1972 and Skovsted 2006
Sister taxa: Agnostina, Ceragnostus, Formagnostus, Glyptagnostidae, Lavsanodiscus, Pleurinodus, Quadrahomagnostinae, Sphaeragnostidae
Subtaxa: Calodiscidae Eodiscidae Hebediscidae Pagetiidae Tsunyidiscidae Weymouthiidae Yukoniidae
Distribution:
• Silurian of the United Kingdom (1 collection)
• Amgan of the Czech Republic (1), Germany (1), Kyrgyzstan (1), the Russian Federation (1), United States (1: Alaska)
• Solvan of Australia (2), Canada (19: Newfoundland and Labrador), the Czech Republic (1), Morocco (2), the Russian Federation (1), Sweden (1), United States (1: Nevada)
• Delamaran of Canada (9: British Columbia, New Brunswick), Mexico (1), Morocco (1), United States (26: California, California-Nevada, Idaho, Nevada, Nevada and California, Pennsylvania, Utah)
• Cambrian of Antarctica (5), Argentina (2), Australia (10), Canada (32: Alberta-British Columbia, British Columbia, Labrador, New Brunswick, Newfoundland, Newfoundland and Labrador, Northwest Territories, Nova Scotia, Quebec, Yukon), China (110), France (1), Germany (1), Greenland (24), India (3), Italy (5), Kazakhstan (7), Mexico (1), Morocco (5), Norway (2), Poland (2), the Russian Federation (37), Spain (1), Svalbard and Jan Mayen (2), Sweden (2), the United Kingdom (8), United States (25: Alaska, Idaho, Massachusetts, Nevada, New York, Pennsylvania, Utah, Vermont, Virginia)
• Caerfai of Italy (3), United States (2: New York)
Total: 360 collections including 542 occurrences