. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 19. H. tucki. Stereophotograph of matrix block containing left distal femur and tibiotarsus. Note transversely oblique proximal tibial surface. Scale = 5 cm. approximate 45° angle with the shaft. Two parallel ridges run along the lateral surface of the trochanter, creating a shallow sulcus between them; the sulcus presumably marks the attachment of coccygeo(caudi)-femoralis brevis. The medial surface of the femur is not visible at the trochanter so the insertion of caudi-femoralis longus cannot
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 19. H. tucki. Stereophotograph of matrix block containing left distal femur and tibiotarsus. Note transversely oblique proximal tibial surface. Scale = 5 cm. approximate 45° angle with the shaft. Two parallel ridges run along the lateral surface of the trochanter, creating a shallow sulcus between them; the sulcus presumably marks the attachment of coccygeo(caudi)-femoralis brevis. The medial surface of the femur is not visible at the trochanter so the insertion of caudi-femoralis longus cannot be checked. Distally, the lateral femoral condyle is the smaller, about 18 mm long, the inner condyle much larger, 24 mm long (Figs 1, 19). Anteriorly and posteriorly, the condyles are not separated by an intercondylar groove. While Fabrosaurus does not have an anterior groove it does have a posterior intercondylar groove. Presumably, the posterior groove is absent in H. tucki because the outer condyle is so poorly developed posteriorly. The transverse axis of the distal femoral articular surface is oblique, that is, the transverse axis is inclined, the lateral edge lower than the medial. However, the superior articular surface of the tibia-fibula is horizontal. Consequently, the femur must be abducted relative to the pelvis to keep the articulation with the tibia-fibula horizontal. A perfectly parasagittal orientation of the femur, often depicted in reconstructions of bipedal dinosaurs, was impossible in H. tucki. Furthermore, the femoral head must have rested against the articular surface of the antitrochanter-like buttress of the ilium to support the body weight. Thus, the femur, in addition to being abducted, would be protracted, so the long axis of the femur passed through the antitrochanter-like articular area. The femur could not have been held vertically for several reasons: firstly, the interace-. Please note that these images are extracted from scanned page images th
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
