†Megastrophia (Protomegastrophia) Caster 1939
Strophomenata - Strophomenida - Strophodontidae
Alternative spelling: Brachyprion (Protomegastrophia)
Parent taxon: Megastrophia according to L. R. M. Cocks 1978
See also Jin and Chatterton 1997
Sister taxa: Megastrophia (Eomegastrophia), Megastrophia (Megastrophia), Megastrophia iddingsi, Megastrophia transitans
Subtaxa: Brachyprion (Protomegastrophia) profunda
Distribution:
• Devonian of China (2 collections)
• Whitwellian of Canada (2: Northwest Territories)
• Silurian of Canada (3: Northwest Territories, Quebec), the United Kingdom (1), United States (49: Illinois, Indiana, Iowa, New York, Wisconsin)
Total: 57 collections each including a single occurrence