Jianianhualong. Limbs The bottom of the large, four-sided coracoid extends backwards with a hook-like projection, the postglenoid process, which is similar in length to that of Sinornithoides but longer than that of Sinovenator. Unlike Sinornithoides but like Mei, the furcula in Jianianhualong is robust, flattened, and U-shaped like that of Mei. Like derived troodontids, the slender humerus is shorter than the femur. The ulna exhibits a slight backward bow; Mei has a much stronger bow, while the bow is absent in most other troodontids altogether. Contrary to most other theropods, the top portion of the radius bears a backwards bow similar to that of the ulna. The hand bears three digits, typical of the Maniraptora, which respectively bear 2, 3, and 4 phalanges. The overall length of the hand is . Several distinguishing characteristics of Jianianhualong are found among the phalanges. The first phalanx of the first digit is unusually long; it bears a "heel" at its top end, as well as a large groove on the interior surface that extends for more than half the bone's length. Additionally, the second phalanx of the second digit is also very long, being longer than the metacarpal of the corresponding digit. The claws are highly robust, with their bases being at least half as wide as their overall length; the claw of the first digit is the largest. The pelvis of Jianianhualong is overall similar to that of Sinovenator. Like Archaeopteryx and basal dromaeosaurids, the ilium is small. A distinguishing trait is that the top margin of the ilium is slightly concave. Below the ilium, the left and right pubes are conjoined into the unusually broad "pubic apron" that is characteristic of troodontids, with a ridge on the rear surface as in Sinovenator. Behind the pubes, the forward-projecting obturator process of the ischium is located near the bottom of the bone. There is a small recess, or lamina, on the margin of the process, another distinguishing trait of Jianianhualong. Among the four metatarsal bones, the second is the shortest and most slender after the first (corresponding to the hallux). The third metatarsal is shorter relative to the femur than that of Sinovenator. Unlike other troodontids, the bottom end of the second metatarsal lacks a hinge joint, and a flange on the bottom of metatarsal IV is also missing. The latter is a distinguishing characteristic. Further below, like derived troodontids and dromaeosaurids, the