What is "opisthocoelicaudiinae"

The Opisthocoelicaudiinae is a clade of titanosaurian dinosaurs from the Late Cretaceous, ranked as a subfamily. Opisthocoelicaudiines are known from China, Mongolia, and the United States ( New Mexico, Texas, and Utah). Three genera have been assigned to Opisthocoelicaudiinae: Alamosaurus, Borealosaurus, and Opisthocoelicaudia (the type genus). It was named by John S. McIntosh in 1990. The hands of opisthocoelicaudiines lacked wrist bones and phalanges.