“They were found in diatom (algae) mines, and were later fossilized.”
Maussan has previously been associated with alleged alien discoveries - many of which were later debunked.
The ufologist displayed the alleged remains after showing government officials several videos of “UFOs and unidentified anomalous phenomena”.
Maussan told reporters and politicians that the remains had been analysed by scientists at the Autonomous National University of Mexico (UNAM).
Three fingers seen on the 'aliens'
The researchers were reportedly able to recover DNA evidence and then carbonate the remains.
X-rays of the ‘aliens’ were shown during the hearing with researchers claiming that one of the bodies held “eggs” inside.
Both fossilised corpses are alleged to have implants made from rare metals.
Federal representative Sergio Guiterrez said: “We are left with thoughts, with concerns and with the plan to continue talking about this, as I said at the beginning, let's hope that this is the first of several events and that there will be discussions with the Legislative on the need or not to make proposals to modify the laws.”