Abstract
X-ray computed tomography of the cladotherian Henkelotherium guimarotae from the Kimmeridgian Guimarota coal mine (Portugal) adds new information on its postcranial skeleton. Contrary to earlier description, the humerus of Henkelotherium shows a plesiomorphic cladotherian condition similar to that seen in Dryolestes leiriensis in having individual radial and ulnar condyles on the anterior aspect of the distal joint, whereas the posterior aspect appears to be trochlear. The scapula is also more plesiomorphic than previously assumed in having a laterally flared crest on the inferior margin. In this regard, it is similar to the scapula of spalacotherioid “symmetrodontans” such as Zhangheotherium but more derived than the latter, in having a larger supraspinous fossa. The hind limb is similar to that of small extant therians, which is interpreted to be assocated with an upright limb posture. The previously proposed hypothesis of an arboreal lifestyle for Henkelotherium is corroborated by a number of skeletal features such as large humeral entepicondyles, prominent digital flexor tubercles, elongated and slender tail vertebrae, as well as a high pedal phalangeal index of 153%.
Published Version
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