Two frontals are preserved. They are each long and wide. The upper surface of each frontal is not smooth. One crest runs along the each frontal, and the together the two crests make up the orbital roof. Both parietals have also been found. The connection between them is marked by a ω-shaped crest. Viewed from the side, the parietal has two extensions. These extensions are not fully preserved, but they would have been on the border of the upper temporal fenestrae in their middle. Each parietal was preserved as wide. The basioccipital of the specimen from Lo Hueco is unique as it has an occipital condyle that is much wider than tall. The occipital condyle has an irregular surface that was probably caused by the loss of the original cartilaginous covering. The complete braincase was especially low in the skull, and was oriented to the side. The occipital condyle is wide and tall. The braincase floor is made by the parabasisphenoid. The prootic is a tall but not long bone. The basisphenoid is mostly on the side of it, along with the laterosphenoid, the parietal, and the otoccipital. The length of the prootic from the front to the back is around .