. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. 52 SPECIAL PUBLICATION MUSEUM OF NATURAL HISTORY NO. 7 deeply concave pioximally in Petrohicosaurus and matches the length of the fourth. The lateral surface of the fifth distal tarsal is smoothly continuous with the narrow distal surface, and is unfinished. This indicates that both these surfaces articulated with the large head of the fifth metatarsal. The fifth meta- tarsal was, therefore, widely divergent. The third distal tarsal not only has rela- tively
. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. 52 SPECIAL PUBLICATION MUSEUM OF NATURAL HISTORY NO. 7 deeply concave pioximally in Petrohicosaurus and matches the length of the fourth. The lateral surface of the fifth distal tarsal is smoothly continuous with the narrow distal surface, and is unfinished. This indicates that both these surfaces articulated with the large head of the fifth metatarsal. The fifth meta- tarsal was, therefore, widely divergent. The third distal tarsal not only has rela- tively small, simple, dorsal and ventral sur- faces, hut also has extensive and complicated articular surfaces with the centrale and the second and fourth distal tarsals. The first and second distal tarsals, like the third, have larger lateral and medial surfaces than cither the dorsally or ventrally exposed areas. The articular surfaces between the proxi- mal and distal elements of the tarsus extend in a straight line roughly peipendicular to the long axis of the pes; in addition, the proximal surface, formed by the astragalus and calca- neum has a rounded, strongly convex outline and fits into the strongly concave distal artic- ular surface fomied by the centrale and the fourth and fifth distal tarsals. The configura- tion of the mesotarsal articulation indicates,. Fit;. 21—PetTolacosaunts Lane. Pes, all X l-S- (A) ReconstmcHon of the left pes, in dorsal view, based mainly on KUVP 1424 and 9951b. (B) Ventral view of the left tarsus, restored with the mesotarsal surfaces exposed, KUVP 9951a. (C) Medial view of the right astragalus, KUVP 33606. (D) Metatarsals in dorsal view, KUVP 99511). .abbreviations used in this Figure: as, ; caj, caleaneum; cp, centralia pedis; fib, artieulation with fibula; tib, articulation witli tibia; 1-5, distal tarsals; I-V, Please note that these images are extracted from scanned page images that may have been digitally
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Keywords: ., bookcentury1900, bookcollectionbi, booksubjectpaleontologykansas
