Rhynchonellata - Orthida - Orthidae
Parent taxon: Orthidae according to R. B. Neuman and D. L. Bruton 1974
See also Jaanusson and Bassett 1993, Neuman 1964, Phleger 1933, Potter 1990, Rubel 1961 and Wright 1964
Sister taxa: Almadenorthis, Bastamorthis, Boreadorthis, Diochthofera, Duolobella, Gutiorthis, Lenorthis, Leoniorthis, Orthambonites, Orthis, Orthostrophella, Orthostrophia, Palaeowingella, Paralenorthis, Rogorthis, Sinorthis, Sulcatorthis, Sulevorthis, Suriorthis, Taphrorthis, Trondorthis
Subtaxa: Krattorthis Sivorthis Turanorthis
Ecology: stationary epifaunal suspension feeder
Distribution:
• Dobrotivian of Spain (1 collection)
• Aluoja of Estonia (1)
• Whiterockian of United States (4: California, Nevada)
• Chazyan of United States (1: Alabama)
• Valaste of Estonia (1)
• Ordovician of Argentina (2), Estonia (7), Kazakhstan (3), Portugal (1), the Russian Federation (5), Spain (4), Sweden (2), the United Kingdom (1), United States (14: Alabama, California, Nevada, Utah, Virginia)
• Ibexian of United States (1: Nevada)
Total: 48 collections including 49 occurrences