Rhynchonellata - Orthida - Heterorthidae
Parent taxon: Dalmanelloidea according to L. Hints and D. A. T. Harper 2015
See also Williams et al. 2000
Sister taxa: Angusticardiniidae, Dalmanellidae, Dicoelosiidae, Harknessellidae, Hypsomoniidae, Kayserellidae, Mystrophoridae, Paurorthidae, Platyorthidae, Portranellidae, Proschizophoriidae, Rhipidomellidae, Tyronellidae
Subtaxa: Arenorthis Cacemia Cilinella Heterorthella Heterorthina Heterorthis Incorthis Marionites Svobodaina Tafilaltia Tarfaya Tissintia
Type: Heterorthis
Ecology: stationary epifaunal suspension feeder
Distribution:
• Silurian of Argentina (7 collections), Brazil (1), Canada (2: Quebec), Guinea (1), Peru (3)
• Dobrotivian of the Czech Republic (1), France (6), Morocco (2), Portugal (11), Spain (18)
• Letna of the Czech Republic (1)
• Arenig of Argentina (4), Bolivia (1), Morocco (1)
• Ordovician to Silurian of South Africa (1)
• Ordovician of Argentina (3), Australia (1), Austria (1), Bolivia (6), Canada (4: Ontario, Quebec), China (1), the Czech Republic (5), France (4), Iran (4), Latvia (1), Morocco (8), Paraguay (4), Peru (2), Portugal (3), Spain (22), Sweden (2), Turkey (1), the United Kingdom (62), United States (40: California, Illinois, Iowa, Kentucky, Michigan, Minnesota, Ohio, Tennessee), Venezuela (1)
• Tremadoc of Argentina (1), Iran (4)
Total: 240 collections including 265 occurrences