Rhynchonellata - Pentamerida - Tetralobulidae
Parent taxon: Tetralobulidae according to J. Hansen and L. E. Holmer 2011
See also Williams et al. 2002
Sister taxa: Punctolirinae, Tetralobula, Tetralobulinae
Subtaxa: Altunella Bobinella Hesperotrophia Palaeostrophia Plectotrophia Rhysostrophia Syntrophopsis Tcharella
Type: Syntrophopsis
Ecology: stationary epifaunal suspension feeder
Distribution:
• Whiterockian of United States (14: California, Nevada, Utah collections)
• Arenigian of United States (1: Nevada)
• Arenig of China (7)
• Canadian of Canada (4: Northwest Territories)
• Ordovician of Australia (2), Canada (5: Alberta, British Columbia, Newfoundland), China (5), Norway (2), United States (20: Arkansas, California, Idaho, Missouri, Montana, Nevada, Utah)
• Ibexian of United States (2: Nevada)
• Cambrian of Canada (1: Quebec), China (28), Iran (1), Kazakhstan (6), United States (1: Texas)
Total: 99 collections including 110 occurrences