sentences:  In 2019, Xuanyu Zhou and colleagues found "I. latidens" and "I. sinensis" to be sister taxa, and close to "Liaoxipterus".Genera such as "Hongshanopterus" and "Haopterus" have at times been considered istiodactylids, but may fall outside the group.In addition to the istiodactylids from China, teeth indicate the presence of the group in Spain and the elsewhere in the UK.