preaxially oriented radial facet as well as a more slender shaft. One feature that is unique to Panderichthys is that the entepicondyle does not project as far as the epipodial facets and the humeral ridge does not go into the entepicondyle. The result of the analysis of the humerus of Panderichthys is that the transition of the humerus from the fish-like organisms to tetrapods occurred much slower than previously thought and Panderichthys now provides a base to determine many autapomorphies. Due to the orientation of the fin towards the posterior end, the attitude of the limb is more horizontal than vertical and the operational space in which it acts is level to the shoulder joint, which causes the muscles to pull at a right angle to the body. This resulted in the ability of Panderichthys to prop up its large head most likely to breathe. Fins and digits Another key feature of Panderichthys is its intermediate form during the evolution of digits. In the past it was believed that digits and fingers had no analogous part in sarcopterygian fish and were evolutionary novelties. However, recent reexamination of existing Panderichthys fossils using a CT scanner shows four very clearly differentiated distal radial bones at the end of the fin skeletal structure. The study performed by Boisvert et al. in 2008 examined the pectoral fins of Panderichthys and found that the fins of Panderichthys are oriented anteroposteriorly, which is different from the limbs of tetrapods that project at an angle from the body. The humerus, radius, and ulna all are analogous to the parts in tetrapods, but the CT scan uncovered the distal fin endoskeleton for the first time. The CT scan performed displayed an ulnare that articulates with the ulna and two terminal radials as well as an intermedium articulating in line to the lateral ridge of the ulna. The CT scan also uncovered radials that can be interpreted as digits, disproving the hypothesis that digits are new structures in tetrapods. These finger-like bones show neither muscle development nor joints and they are extremely small, but nonetheless show an intermediate form between fully fish-like fins and tetrapods. Similar to the humerus, Panderichthys also has a more derived feature than Tiktaalik because it has an ulna that is longer than its ulnare, which is a feature of tetrapods. Pelvic girdle Additionally, the pelvic girdle and pelvic fins of Panderichthys represents an intermediate