Bivalvia - Trigoniida - Trigoniidae
Alternative spelling: Iotrigonia
Parent taxon: Megatrigonia according to L. R. Cox 1952
See also Bouchet et al. 2010 and Sepkoski 2002
Sister taxa: Megatrigonia (Apiotrigonia), Megatrigonia arsinoe, Megatrigonia carrincurensis, Megatrigonia conocardiiformis, Megatrigonia discors, Megatrigonia eximia, Megatrigonia obesa, Megatrigonia picunensis, Megatrigonia pusilla, Megatrigonia staffi
Subtaxa: Iotrigonia consanguinea Iotrigonia crassitesta Iotrigonia dubia Iotrigonia flexicostata Iotrigonia foveata Iotrigonia gamporrhyncha Iotrigonia glyptica Iotrigonia haughtoni Iotrigonia leucothea Iotrigonia limatula Iotrigonia lorenti Iotrigonia manflarum Iotrigonia ovallei Iotrigonia recurva Iotrigonia rolli Iotrigonia vau Iotrigonia vscripta
Type: Iotrigonia crassitesta
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Cretaceous of Antarctica (1 collection), Argentina (2), Australia (1), Chile (1), India (2), New Zealand (7), South Africa (1), Turkmenistan (2), Ukraine (1)
• Jurassic of Antarctica (3), India (1), Tanzania (2)
Total: 24 collections including 26 occurrences