Efraasia minor ( Galton, 1973 )

Nesbitt, Sterling J., 2011, The Early Evolution Of Archosaurs: Relationships And The Origin Of Major Clades, Bulletin of the American Museum of Natural History 2011 (352), pp. 1-292 : 54

Efraasia minor ( Galton, 1973) , sensu Yates, 2003

AGE: Middle Norian, Late Triassic ( Yates, 2003).

OCCURRENCE: Middle Löwenstein Formation, Weisser Steinbruch (Quarry), Pfaffenhofen, Germany, lower Löwenstein Formation, Goesel Quarry, Ochsenbach, Germany, ( Yates, 2003).

HOLOTYPE: SMNS 11838, dorsal vertebrae, one sacral vertebra, right manus, partial left manus, pubes, right femur, tibia, and fibula, and partial right pes.

REFERRED MATERIAL: SMNS 12188–92, 12354, 12667, 12684, 17928.

REMARKS: In a revision of sauropodomorph taxa from the Triassic of Germany, Yates (2003) assigned the sauropodomorphs from Weisser Steinbrunchh, Pfaffenhofen, Germany, to the taxon Efraasia . Efraasia represents one of the more plesiomorphic sauropodomorphs ( Yates, 2003). Recent phylogenetic analyses of basal sauropodomorph relationships ( Yates, 2007; Upchurch et al., 2007) found Efraasia diverging before the split of prosauropods ( Plateosaurus -like taxa) and the lineage leading to Sauropoda.

Efraasia minor possesses two autapomorphies, interbasipterygoid web with a central tubercle and a hypertrophied semilunateshaped pubic tubercle projecting laterally from the proximal pubis ( Yates, 2003).

KEY REFERENCES: Huene, 1908; Galton, 1973; Yates, 2003.