Kongonaphon is an extinct genus of reptile that lived in Madagascar during the Middle to Late Triassic.
Kongonaphon stood barely shy of 4 inches tall. The maxilla is tall, and wide from the front. Six teeth were fossilized in the maxilla, and the maxilla lacks the rear portion. Kongonaphon has teeth resembling pegs, that are conical in shape. The teeth have a circular cross-section, and are ornamented by irregular pitting, a trait that modern insectivores specialize in. A limb bone is known, and is thought to have been the lower segment of a humerus. The bone has poorly distinguished condyles (a trait unlike Ixalerpeton's humerus), and is asymmetrical (like Ixalerpeton).
Kongonaphon's femur is very slender, sigmoid and it's fourth trochanter is prominent. The head of the femur shares similarities with related lagerpetids. The bone is strongly hooked, with a concave emargination on the lower edge. From a birds-eye-view's perspective, the femural head has a big posterormedial tuber, a reduced anterolateral tuber and lacks a anteromedial tuber. The upper segment of the femur is adorned with a anterior trochanter, a trait that only appears in certain mature lagerpetids (especially Dromomeron gregorii, and Ixalerpeton polesinense). The fourth trochanter resembles a blade, and has a bent inner edge, and the other side smoothly transitions into the rest of the femur's shaft. Both features are also found in Ixalerpeton and Lagerpeton/Dromomeron. The bent inner edge (of the fourth trochanter) oversees a depression split in two halves by a thin ridge.
The femur extends, and thins significantly near the eroded or broken lower extremity. Other lagerpetids have a femur that grows in width towards the knee. Fragments of the tibia curve, and expand knee. A pair of elongated and closely-appressed bones have been identified as metatarsals, but is still questioned because they are slightly bent. The pedal phalanges are shaped like hourglasses, and are strongly developed at the point of the joints. The tail vertebrae are long and thin, with concave lower edges with fused neurocentral sutures.
The fossil growth rings were researched, and it has been determined the animal fossilized was mature.
Kongonaphon is part of the clade ornithodira, and more specifically lagerpetidae. Kongonaphon is the last known relative of dinosaurs and pterosaurs.