Like the modern monitor lizard, Thadeosaurus was an amphibious hunter. When swimming, it used only its tail, keeping its legs for manoeuvring and for walking on land. This animal represented the start of an evolutionary trend that would eventually lead to the almost fully aquatic nothosaurs and the totally marine plesiosaurs of the Mesozoic era. life size dinosaur costume
Features: The tail of Thadeosaurus is about twice the length of the body to help in swimming. The five clawed toes of the hind foot are arranged with the longest on the outside, an adaptation to efficient movement on land. The breastbone is well developed, also as a response to an increase in the efficiency of terrestrial motion. This was an animal at home in the water as well as on land.
Early diapsid aquatic life advanced with Hovasaurus. The tail was paddle-like and twice the length of the rest of the body. Skin impressions have been found, and these show lizard-like scales. Close relatives Tangasaurus and Barasaurus are almost identical, differing only in the height of the spines on the tail. Hovasaurus is known from several specimens, all of which had stomach stones that must have been swallowed to counteract excessive buoyancy while swimming. It seems possible that Hovasaurus and its relatives survived the end-Permian extinction event. Dinosaur equipment
Features:This creature is very similar to Thadeosaurus. to which it is closely related, but it shows much greater adaptations to an aquatic way of life. The spines on the tail are long, supporting a deep paddle-like tail, and those on the back are also long, suggesting the presence of a fin-like stabilizing structure. Stones are present in the stomach area of some specimens, and these would have been swallowed as a buoyancy control.