Thalattoarchon

Thalattoarchon is a genus of large, Middle Triassic predatory ichthyosaurs from North America, containing the single species T. saurophagis. The taxon was described in 2013 from a single partial skeleton discovered in Nevada. The generic name, meaning "ruler of the seas", refers to its status as an apex predator, while the specific epithet, meaning "lizard eater", alludes to its carnivorous diet. As an ichthyosaur, Thalattoarchon had flippers for limbs and a fin on the tail. It was a large ichthyosaur, with an estimated length of between 8 and 9 meters (26 and 30 ft). The animal had a long, slender body but with a proportionally large head and a straight, elongated tail. The jaws of Thalattoarchon feature large teeth with two cutting edges of up to 12 centimeters (4.7 in). Although the fossils are incomplete, the animal would have had a skeleton comprising at least 60 presacral vertebrae. The classification of this genus within the ichthyosaurs is much debated, being either classified within the clade Merriamosauria or in the more basal family Cymbospondylidae. As its scientific name indicates, its sharp, cutting teeth suggest that it could easily have preyed upon other marine reptiles of its time, indicating that it most likely occupied the highest position in the food chain.