Rhynchonellata - Orthida - Phragmorthidae
Alternative spelling: Phragmorthinae
Parent taxon: Plectorthoidea according to J. Hansen and L. E. Holmer 2011
See also Potter 1990 and Williams et al. 2000
Sister taxa: Apatoskenidioides, Chilcorthidae, Cremnorthidae, Cyclocoeliidae, Eoorthidae, Euorthisinidae, Finkelnburgiidae, Giraldiellidae, Lebediorthis, Nanorthidae, Platystrophiidae, Plectorthidae, Ranorthidae, Rhactorthidae, Tasmanorthidae, Wangyuiidae
Subtaxa: Phragmorthis
Ecology: stationary epifaunal suspension feeder
Distribution:
• Whiterockian of United States (2: Nevada collections)
• Chazyan of United States (1: Alabama)
• Ordovician of Argentina (2), China (4), Iran (1), Kazakhstan (9), Norway (6), the United Kingdom (6), United States (19: Alaska, California, Virginia)
Total: 50 collections each including a single occurrence