Helicoprion Variante:Imprimado It is estimated that the

It is estimated that the Coahuilaceratops measured around 8 meters in length and weighed 4-5 tons

rex "Tyrant Lizard") was one of the largest and most ferocious dinosaurs to exist on Earth during the Late Cretaceous Maastrichtian period

although it was probably primarily quadrupedal

which could measure 9 to 12 m long

which allowed it to chase and capture fast and agile prey

Helicoprion Variante:Imprimado It is estimated that theHelicoprion (H. ergassaminon, `Sierra en espiral) es un gnero de peces cartilaginosos extintos que se asemejaban a los tiburones en su apariencia y comportamiento. Este gnero emergi por primera vez en los ocanos del Carbonfero Superior, hace aproximadamente 290 millones de aos, y sobrevivi a la extincin masiva del Prmico Trisico, que ocurri hace unos 252 millones de aos. Sin embargo, finalmente se extingui en el Trisico Superior, hace aproximadamente