Alongside other miniaturized archosaurs such as Scleromochlus, it suggests that avemetatarsalians experienced an abrupt reduction in size early in their evolution.
The most successful avemetatarsalian subgroups, pterosaurs and dinosaurs, may have evolved as a result of this abrupt size reduction.
Miniaturization has been correlated with the evolution of flight (a defining feature of pterosaurs) and the acquisition of bipedalism (which was utilized by many dinosaurs).
The site preserves the lower part of the informally named Isalo II beds (also known as the Makay Formation).
The basal Isalo II beds are likely late Ladinian or early Carnian in age based on cynodonts shared with the Santa Maria Supersequence of Brazil.
Together, Kongonaphon kely translates to "tiny bug slayer", according to its diminutive size and potentially insectivorous habits.
The teeth are ornamented by irregular pitting, a texture which in modern animals is correlated with a diet of insects.
The outer side of the femoral head also has an anterior trochanter, a muscle scar which is present in some lagerpetids but absent in others.
Both of these features are more similar to Ixalerpeton than Lagerpeton (or Dromomeron, which has a fourth trochanter which is small and mound-like in some species and absent in others).
The long and narrow caudal (tail) vertebra has a concave lower edge and fused neurocentral sutures.
[6] This analysis did not originally include Scleromochlus, a tiny archosaur often considered distantly related to pterosaurs.
The first iteration of the analysis found Kongonaphon and other lagerpetids to be the earliest-diverging dinosauromorphs, more closely related to dinosaurs than to pterosaurs.
Ixalerpeton Lagerpeton Dromomeron Lagosuchus Silesauridae Dinosauria The teeth of Kongonaphon are similar to those of insect-eating modern animals in both shape and texture.
[9] A histological study on a tibia fragment of UA 10618 has helped clarify the animal's bone structure, growth, and development.
Vascular canals are common in the cortex, and are primarily longitudinally oriented (parallel to the bone's shaft and circular in cross-section).
The branching canals appear to radiate towards the outer cortex, a trait also observed in the bones of Dromomeron romeri.
Parallel-fibered bone, lines of arrested growth, and flattened osteocyte lacunae are all correlated with the animal having been alive for quite some time prior to dying and becoming fossilized.