Monster of Aramberri

Speculations on size and ontogenetic stage

It was originally estimated that the remains belonged to a young individual which was more or less 15 meters long (both claims are questionable), claims of the specimen being 18 meters long were created by media. It was initially falsely identified as Liopleurodon ferox; this conclusion was used in BBC's Walking with Dinosaurs, in which the individual was the base to depict a very big Liopleurodon. French and German paleontologists classified it as a giant pliosaur, which lived around 140 millions years ago in shallow waters of the area, in what is now Aramberri, Mexico.

The specimen is not properly named and described yet though the first assumptions of it being a juvenile individual have been outdated and that it is apparently not related to Liopleurodon ferox. It remains possibly one of the largest pliosaur known, and perhaps the largest, even though recent size estimates that compare the cervical vertebrae of the Aramberri pliosaur with those of Kronosaurus (possibly a close relative) yield smaller estimates, i.e. a mean length of 11.7 meters and a mean body mass of 15 metric tonnes.

Excavation and restoration

The director of excavation is Dr José Guadalupe López Oliva from the Facultad de Ciencias de la Tierra de la UANL. Other specialists involved are Dr. Wolfgang Stinnesbeck from the Faculty of Geosciences of Karlsruhe University, and Dr. Eberhard ("Dino") Frey and Dr. Marie Buchy of the Museum of Natural History of Karlsruhe, Germany.

1. In 2001, the site was evaluated and dispersed remains were recovered. The stratum which contains pliosaur remains was identified.
2. In 2002, a specific excavation began, supported by local people, to cleanse the sediment which contains bone remains of different sizes.
3. Some remains were sent to the Museum of Natural History of Karlsruhe.

Monster of Aramberri in Germany

On January 3, 2003, remains of the Monster of Aramberri arrived in Karlsruhe, boxed in 14 huge containers. The Museum of Natural History of the city of Karlsruhe was the place assigned for its reconstruction.

The bones would be prepared by the specialists of the Museum in order to copy them. Copies would stay at the Museum, while originals would return to Mexico.

Monster returns

As the Museum of Natural History of Karlsruhe could not accept any more remains because it was at its maximum capacity, new remains were sent to the Museo del Desierto in Saltillo, Coahuila, also in Mexico, where the specialist in marine reptiles, Dra. Marie Buchy, is still studying them.

Monster today

Nowadays, part of the fossil is on display at Museo de Historia Mexicana, in a temporary exposition called "Fósiles Marinos de Nuevo Léon, antes mar, ahora montañas".

In November 2012, after 27 years from its discovery spent on expositions and research, the "Monster of Aramberri" remains were transferred to Facultad de Ciencias de la Tierra from UANL located at Linares, Nuevo León, México.