. Bulletin. Natural history; Natuurlijke historie. Fig. 18. Two views of the probable clavicle of Psittacothenum multijragum, TMM 41364-1. Scale is 4 cm long. Pectoral Girdle and Forelimb Clavicle What appears to be a partial clavicle of Psittacothenum is preserved in TMM 41364-1 (Fig. 18; PI. 28: figs. 7, 8). It is a large, robust, flattened and slightly recurved bone. Humerus Matthew (1937, p. 262) reported that the proximal and distal ends of the hu- merus of Psittacothenum were preserved with AMNH 3962. I have not been able to locate this specimen. However, the distal end of a right humeru
. Bulletin. Natural history; Natuurlijke historie. Fig. 18. Two views of the probable clavicle of Psittacothenum multijragum, TMM 41364-1. Scale is 4 cm long. Pectoral Girdle and Forelimb Clavicle What appears to be a partial clavicle of Psittacothenum is preserved in TMM 41364-1 (Fig. 18; PI. 28: figs. 7, 8). It is a large, robust, flattened and slightly recurved bone. Humerus Matthew (1937, p. 262) reported that the proximal and distal ends of the hu- merus of Psittacothenum were preserved with AMNH 3962. I have not been able to locate this specimen. However, the distal end of a right humerus of Psittacothenum is known from TMM 41364-1 (PI. 28: figs. 5, 6). The humeral fragments that Matthew (1937, p. 262) studied were very similar in morphology to the humerus of TMM 41364-1, which is in turn extremely similar to that of Ectoganus (Fig. 27). The humerus of Psittacothenum is short, stout and massive. Matthew (1937, p. 262) described the proximal end as follows: "The head of the humerus faces more proximal than in Onychodectes, much as in Pantolambda, but the internal tuberosity is much larger and more prominent than in the latter, as large as the external although lower set. From the front of the external tuberosity a heavy crest runs down the anterior face of the bone, towards what was presumably a high deltoid crest, as in primitive placentals generally, but the shaft of the bone is not ; The distal end of the humerus is expanded transversely. Medially it bears a large, circular entepicondylar foramen enclosed by a strong, massive internal condyloid (pronator) ridge. The medial epicondyle is well developed, forming a prominent internal tuberosity. Laterally, the supinator ridge is well developed and recurved anteriorly. The lateral epicondyle is prominent, but not so large as the medial epicondyle. The medial trochlear crest is poorly developed and only extends as far distally as the capitulum. Mediolaterally, the trochlea is smoothly concave and
Size: 2860px × 874px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiv, booksubjectnaturalhistory
