Consider other hominoid fossils that may or may not show affinities specifically with the orangutan, such as Heliopithecus, Turkanapithecus, Kenyapithecus, and Ouranopithecus.    From Wordnik.com.  [Archive 2006-04-01] Reference

This study provides a survey of mandibular shape in a sample of extant hominoids (Pan, Gorilla, Pongo, and Hylobates), as well as extinct Asian and Eurasian taxa (Ouranopithecus, Sivapithecus, and Gigantopithecus) in order to compare overall shape similarity.    From Wordnik.com.  [Archive 2009-02-01] Reference

Ouranopithecus occupied more open habitats shared by grazers than the other primates of.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference