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1 INTRODUCTION Our previous descriptions of limb muscle myological arrangements in two-toed sloths (see Tucker et al., 2026) identified several modifications that matched well with their needs for frequent and/or prolonged suspensory locomotion and posture. These included modifications to the origin of m. trapezius pars cervicalis and m. biceps brachii-short head; a complex shoulder–elbow muscle chain; extra of bellies of mm. rhomboidei, m. pectorales superficialis, and m.
Architectural properties Myological descriptions for B. variegatus dissection originally followed those of Macalister (1869), Humphrey (1870), Mackintosh (1875), and Windle and Parsons (1899), but were updated in a recent companion study (Butcher et al., 2022). Briefly, the pelvic limbs were skinned and all muscles were systematically dissected (excised proximal-to-distal) beginning with extrinsic muscles of the pelvic girdle.
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