[1] Several vertebrae and rib fragments as well as part of the basicranium have been found from the Maastrichtian-age Maevarano Formation in the Mahajanga Basin.

Evidence of a fossorial lifestyle can be found in its braincase, as the bones of the basicranium are highly fused to withstand stresses from burrowing.

The atlas, which is the first vertebra of the spine closest to the head, may show adaptations toward structural integrity under loads that would be encountered during tunnel excavation.

The neural arches of the atlas are fused to the intercentrum, strengthening the anterior atlantal cotyle, a cup-like depression that articulates with the occipital condyle of the skull.

Menarana would not have been able to consume any of the nonavian dinosaurs that are also known from the Maevarano Formation, and probably could not prey on any crocodylomorphs with the exception of the notosuchian Araripesuchus tsangatsangana.