. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. Fig. 22.—Petrolacosaurus kansensis Lane. Reconstruction of the left femur in dorsal (A) and ventral (B) views, based mainly on KUVP 9951 and 33606, x attachment, the dorsal condylar surfaces are concave. Between these ridges the femur is notched dorsally by a deep intercondylar fossa for the tendon of the quadriceps muscle. The surfaces for articulation with the tibia and fibula extend onto the dorsal surface. The distal ventral surface of the femur is d
. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. Fig. 22.—Petrolacosaurus kansensis Lane. Reconstruction of the left femur in dorsal (A) and ventral (B) views, based mainly on KUVP 9951 and 33606, x attachment, the dorsal condylar surfaces are concave. Between these ridges the femur is notched dorsally by a deep intercondylar fossa for the tendon of the quadriceps muscle. The surfaces for articulation with the tibia and fibula extend onto the dorsal surface. The distal ventral surface of the femur is deeply concave and rugose. A prominent posterior ridge extends distally along the pos- terior condyle. Its continuation onto the ar- ticular area forms the boundary between the areas of articulation with the tibia and fibula. Tibia.—The tibia and fibula are known in at least two specimen;;—KUVP 9951b and 33606. The tibia (Fig. 23) is quite long, its length equalling that of the femur. As with other distal limb bones, the tibia is slender. The width of the head in one specimen is about 20 per cent of the length of the bone, and the distal width is nearly 12 per cent of the length. The shaft has a minimum diam- eter of only per cent of its length. These proportions are comparable to those in Araeo- scelis (Vaughn, 1955). The tibia is immediately identifiable by the conspicuous anterior concavity of the shaft and by the large head. The articular surface of the head is similar in outline to that of primitive captorhinomorphs (Carroll, 1969) and pelycosaurs (Romer and Price, 1940). The proximal portion of the tibia is roughly triangular in cross-section as is the outline of the articular surface. Two well developed ridges pass distally along the lat- eral and anterior margins. The latter prob- ably afforded attachment for an interosseous ligament. As in Araeoscelis the distal articu- lar surface of the tibia can be divided into two parts that form a fimi, locked joint with
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Keywords: ., bookcentury1900, bookcollectionbi, booksubjectpaleontologykansas
