tetrapods are thought to have been descended from dinosaurs.
tetrapods are thought to have been descended from dinosaurs.
which class is thought to have been descended from dinosaurs?
tetrapods
bipedalism evolved more than once in archosaurs, the group that includes both dinosaurs and crocodilians. all dinosaurs are thought to be descended from a fully bipedal ancestor, perhaps similar to "eoraptor". bipedal movement also re-evolved in a number of other dinosaur lineages such as the iguanodons. some extinct members of the crocodilian line, a sister group to the dinosaurs and birds, also evolved bipedal forms - a crocodile relative from the triassic, "effigia okeeffeae", is thought to be bipedal. pterosaurs were previously thought to have been bipedal, but recent trackways have all shown quadrupedal locomotion. bipedalism also evolved independently among the dinosaurs. dinosaurs diverged from their archosaur ancestors approximately 230 million years ago during the middle to late triassic period, roughly 20 million years after the permian-triassic extinction event wiped out an estimated 95% of all life on earth. radiometric dating of fossils from the early dinosaur genus "eoraptor" establishes its presence in the fossil record at this time. paleontologists suspect "eoraptor" resembles the common ancestor of all dinosaurs; if this is true, its traits suggest that the first dinosaurs were small, bipedal predators. the discovery of primitive, dinosaur-like ornithodirans such as "marasuchus" and "lagerpeton" in argentinian middle triassic strata supports this view; analysis of recovered fossils suggests that these animals were indeed small, bipedal predators.
bipedalism
in order to progress through the game, players must use their dinosaurs to defeat enemy dinosaurs in an attack and dodge oriented combat system. the playable dinosaurs have slightly different stats. while in combat, players press the b button to attack and the a button to push or charge into the enemy. players can also make their dinosaurs dodge. some dinosaurs are equipped with certain "weapons." when equipped, these items lend the dinosaurs power-ups. on certain occasions, enemy dinosaurs will flash blue. if the player attacks an enemy dinosaur while it is flashing blue, the player's dinosaur will perform a powerful attack called a "dinostrike". enemy dinosaurs will flash red shortly before they attack. this signals players to prepare to dodge or risk losing health. dinosaurs can also perform "frenzy attacks" that deal more damage than normal attacks. the game contains earthquakes and volcanic eruptions that can knock dinosaurs around and damage them during combat. the player wins a fight by reducing the health of all enemy dinosaurs to zero.
combat of giants: dinosaurs 3d