Knowra Mosasaur Mosasaur A mosasaur is an extinct marine squamate reptile that lived during the Cretaceous Period. Its streamlined body, paddle-like limbs, and powerful tail adapted it to life in the sea.
Squamata : The reptile order that includes lizards, snakes, and mosasaurs. Mosasaurs belong to this diverse reptile lineage, rather than to dinosaurs or marine mammals.
Mosasaur tail : The muscular rear section of a mosasaur, ending in a vertically expanded fluke. Its crescent-shaped fluke supplied much of the thrust during swimming.
Mosasaur evolution : The evolutionary history of mosasaurs from early terrestrial or semiaquatic squamate ancestors. The transition to marine life explains the group’s changing limbs, tails, and body shape.
Mosasaurus hoffmannii : A large species of mosasaur from the Late Cretaceous, known from European fossils. This species helped establish the scientific recognition of mosasaurs.
Cretaceous–Paleogene extinction event : A mass extinction about 66 million years ago that eliminated non-avian dinosaurs and many other groups. Mosasaurs disappeared in this extinction event at the end of the Cretaceous.
Amniote : A vertebrate whose embryo develops within an amnion and related protective membranes. Mosasaurs were amniotes, a broader group that includes reptiles, birds, and mammals.
Mosasaur skull : The skull of a mosasaur, often elongated and equipped with recurved teeth. Skull shape and tooth arrangement reveal how different species captured prey.
Aigialosauridae : A family of early, generally small mosasaur relatives with adaptations for aquatic life. Aigialosaurs preserve features near the early stages of mosasaur marine adaptation.
Tylosaurus : A genus of large mosasaurs characterized by an elongated, toothless snout tip. Its distinctive snout and robust build exemplify a major mosasaur body plan.
Deccan Traps : A vast province of volcanic rock in India formed by repeated eruptions near the end of the Cretaceous. Its eruptions were one of the major environmental stresses near mosasaurs’ extinction.
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