Board Thread:Movie discussion/@comment-6025261-20160208025108/@comment-26923065-20160211112420

FireTerryTiger wrote: Some of the known species that were used in the creation of the hybrid are: T. rex, Velociraptor, cuttlefish, (possibly) the pit viper, tree frog (confirmed in the film), Carnotaurus, Giganotosaurus, Majungasaurus, Rugops (confirmed on the website), Therizinosaurus (confirmed by Jack Horner), possibly other abelisaurs such as Abelisaurus, a number of unspecified modern animals

 Dinowolf found these are the genetic choices Pit Viper has been confirmed by the official Tumblr page and there is no evidence of other Abeilosaurs other than the 3 mentioned to be part of the Indominus rex.