Gryponyx

Gryponyx (meaning "hooked-claw") is an extinct genus of massopod sauropodomorph known from southern Free State, central South Africa.
Description.
"Gryponyx africanus" is known from the holotype SAM 3357-59, a nearly complete postcranial skeleton which includes partial vertebral column, pelvis, both forelimbs and both hindlimbs. "Gryponyx" has been estimated to have been about in length. It was collected from the Upper Elliot Formation of the Stormberg Group (Karoo Basin), dating to the Hettangian to Sinemurian stages of the Lower Jurassic period.
It was originally described by Broom (1911) as a theropod. Huene (1932) named the family Gryponychidae to contain "Gryponyx" and "Aetonyx" and placed it within Carnosauria. Galton and Cluver synonymized "G. africanus" with "Massospondylus harriesi" in 1976, which was in turn synonymized by Michael Cooper in 1981 with "Massospondylus carinatus" (and today "M. harriesi" is considered to be a "nomen dubium"). However, Vasconcelos and Yates (2004) found "Gryponyx" to be distinctive enough from other basal sauropodomorphs to be placed in its own genus. They found that it differs from other taxa by the following characteristics: total length of metacarpal I exceeds maximum proximal width and a long, narrow pubic apron with straight lateral margins. Although this publication wasn't formal, they conducted a cladistic analysis using Yates (2004) sauropodomorph matrix and found "Gryponyx" to be the most basal massospondylid. The same result was found by Lü Junchang "et al." (2010). Yates "et al." (2010) recovered "Gryponyx" in a trichotomy with Massospondylidae and Anchisauria. However, "Gryponyx" has yet to be formally redescribed.
Two additional species of "Gryponyx" have been described: "G. transvaalensis" was described on the basis of finger bones and the anterior limb metatarsals from the Late Triassic Bushveld Sandstone Formation, Transvaal. "G. taylori" was described on the basis of sacral and pelvic rim from the Upper Elliot Formation, southern Free State. Galton and Cluver (1976) synonymized "G. taylori" with "M. harriesi" and considered "G. transvaalensis" to be a "nomen dubium". Both "G. taylori" and "G. transvaalensis" were synonymized by Michael Cooper (1981) with "M. carinatus" and Galton and Upchurch (2004) considered them to be dubious.
Etymology.
"Gryponyx" was first named by Robert Broom in 1911 and the type species is "Gryponyx africanus". The generic name is derived from "grypos", Greek for "hooked" and "onyx", Greek for "claw". The specific name refers to Africa, where the holotype was discovered.