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Comparison of the shoulder girdle skeleton. (A,B) Lateral views of the left shoulder region of Dimetrodon (A) and Pelodiscus sinensis (B). (C,D) Lateral views of the left endochondral girdle of Dimetrodon (C) and P. sinensis (D). ac, acromion; bl, scapular blade; c, cleithlum; cl, clavicle; ds, dorsal shell; eg, endochondral girdle; gl, glenoid cavity; h, humerus; ic, interclavicle; met, metracoracoid; pro, procoracoid; r, ribs; scf, supracoracoid foramen; vs, ventral shell.
