By Moore R C

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Based on a single large femur, Gauffre (1993) described a second species, Melanorosaurus thabanensis, from the Upper Elliot Formation of Lesotho, southern Africa (Hettangian to Pliensbachian, Lower Jurassic; Olsen and Galton 1984; Olsen and Sues 1986). This femur (Fig. 13C, I) differs from NM QR1551 in being slightly more robust, but particularly in that the fourth trochanter is situated away from the medial margin (in posterior view) and extends slightly more distally than in either M. readi or Riojasaurus.

Comparisons with NM QR1551 (Fig. 6A) indi- cate that the three cenrra illustrated by Van Heerden (1979, pls. 58, 59, 60) are those of sacral vertebrae 1 and 2 (with most of left rib) and a possible proximal caudal of Plateosaurauus. 7,9, pIs. 13, L6, 17) with a dorsosacral (Van Heerden 1979: fig. 8, pls. 74, 15; misidentified as the third sacral, a caudosacral, see Galton 2001b); Novas \1996) came to the same conclusion for Riojasaurus (Fig. 6E). In prosauropods, the plesiomorphic condition of rwo sacral vertebrae are supplemented by a third, which can be incorporated from either the tail (S1 + 52 + CS as in Plateosaurus) or from the dorsal series (DS + 51 + 52 as in Massospondylzs) (Galton 1999, 2001b).

Tetrapod-based correlation of the nonmarine Upper Triassic of southern Africa. Albertina 25 5-9. MacRae, C. 1999. Life Etched in Stone. Johannesburg: Geological Society of South Africa. Marsh, O. C. 1885. Names of extinct reptiles. American Journal of Science (series 3) 29:169. 1895. On the affinities and classification of the dinosaurian repti\es. American Journal of Science (series 3) 50: 483-498. Novas, F. E. 1989. The tibia and tarsus in Herrerasauridae (Dinosauria, incertae sedis) and the origin and evolution of the dinosaurian tarsus.

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Invertebrate Paleontology (R) Arthropoda 4 by Moore R C

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