†subfamily Orbiculoideinae Schuchert 1929 (lamp shell)
Lingulata - Lingulida - Discinidae
Parent taxon: Discinidae according to L. E. Holmer 1989
See also Holmer 1986, Holmer 1987, Mitchell 1977, Owen and Harper 1982, Popov 2000 and Wright 1963
Sister taxa: Acrosaccus, Chynithele, Discradisca, Gigadiscina, Opatrilkiella, Orbiculoidea, Roemerella, Schizotreta
Subtaxa: none
Ecology: stationary low-level epifaunal suspension feeder
Distribution:
• Carboniferous of United States (1: California collection)
• Uhaku of Sweden (6)
• Ordovician of Sweden (15)
Total: 22 collections each including a single occurrence