Brouffia orientalis (Carroll and Baird 1972) Westphalian, Late Carboniferous, (CGH IIIB 21 c. 587) and counterpart (MP451), specimen 1 of Brough and Brough (1967) was considered very small Gephyrostegus with two sacrals and an intertemporal. Carroll (1970) considered it not congeneric. Carroll and Baird (1972) considered it a primtiive reptile with a single sacral and no intertemporal. Here it nests as a sister to Casineria, as one of the most primitive of all reptiles at the base of the Archosauromorpha. So this specimen provides insight into the configuration of the missing skull of Casineria. Both were derived from Gephyrostegus, probably the smaller specimen.
Pre-reptiles developed as tadpoles. But at some point described hypothetically by Carroll (1970) the tadpole stage took place completely within the egg and the hatchling emerged as a miniature of the adult, as is the custom with reptiles.
Compared to Gephyrostegus, overall the skull of Brouffia was relatively smaller (which is generally not a juvenile trait) and relative to the orbit the skull was smaller too. The naris was smaller. The maxilla produced a midlength ascending process. The nasal lost the arrowhead shape and had even, parrallel lateral borders. The jugal was not so deep, rising only to mid orbit. The prefrontal remained above the midorbit. The frontals were likewise parallel laterally, developing posterior extensions. The intertemporal was fused to the parietal. The otic notch was reduced with a straight posterior rim to the posterior squamosal, a key trait of reptiles. The small posterior skull elements bent down. The ventral mandible was convex. No fangs dotted the palate.
The neural spines were lower. More cervicals and more dorsal vertebrae were present. Two sacrals were present. The cervical ribs were larger.
The coracoid continued to be incorporated into the interclavicle ventrally. The medial clavicle was pointed, perhaps with a broader unossified portion. The cleithrum was more robust. The humerus was a narrow hourglass-shape. The radius and ulna were relatively longer. The manus was more asymmetric than originally reconstructed.
The pelvis was smaller with a proportionately smaller ventral pelvis. The parts were not coosified, but disarticulated. The ilium may have developed an anterior vertical process, an autapomorphy. The proximal tibia was narrower.
Smaller, lighter, longer-waisted, more agile, this basal reptile has a smaller pelvic opening that could only pass relatively smaller eggs.