Phalanx bone The proximal phalanges join with the metacarpals of the hand or metatarsals of the foot at the metacarpophalangeal joint or metatarsophalangeal joint. The intermediate phalanx is not only intermediate in location, but usually also in size. The thumb and large toe do not possess a middle phalanx. The distal phalanges are the bones at the tips of the fingers or toes. The proximal, intermediate, and distal phalanges articulate with one another through interphalangeal articulations. Each phalanx consists of a central part, called the "body", and two extremities. In the foot, the proximal phalanges have a body that is compressed from
Dianopachysaurus a triangular acetabulum, and a reduced but still quite robust dorsal process. The pubis is round, and has an open obdurator foramen, but the ischium is almost entirely hidden. The femurs are slender and slightly sigmoid, with distinct striations on both ends. They are 14 mm long. The fibulae are slightly longer than the tibiae, at 6.5 rather than 6 mm long. The astragali are larger than the calcanea, but both have flat proximal margins. The first metatarsals are distinctly shorter than the others, and many metatarsals are covered by phalanges and so not fully visible. Enough phalanges are preserved