Table of Contents
What did the archosaurs evolve from?
The first known archosaurs appeared in the Middle Triassic Period (about 246 million to 229 million years ago). They evolved from an earlier group of diapsid reptiles, diapsids having two openings in the skull behind the eye.
What did hippos evolve from?
Hippos likely evolved from a group of anthracotheres about 15 million years ago, the first whales evolved over 50 million years ago, and the ancestor of both these groups was terrestrial. These first whales, such as Pakicetus, were typical land animals. They had long skulls and large carnivorous teeth.
What did cetaceans evolved from?
Cetaceans originated from land mammals (Thewissen and Williams 2002; Fordyce and Muizon 2001). Many features that are common in land mammals have changed in the evolutionary process that led to cetaceans. The presence of hair or fur, for instance, is characteristic of mammals.
What did dinosaurs evolve from?
Dinosaurs evolved from other reptiles (socket-toothed archosaurs) during the Triassic period, over 230 million years ago. Dinosaurs evolved soon after the Permian extinction, which was the biggest mass extinction that ever occured on Earth. During this time (the Triassic period), the mammals also evolved.
Can you eat a hippo?
They can be dangerous if they feel threatened but are usually just looking for a good meal. Hippo meat is a popular food in Africa and is considered a delicacy. The meat of the hippo can be cooked many different ways: grilled; roasted over an open fire or spit-roasted on top coals from wood fires (a traditional method.
What were the first amniotes like?
The first amniotes, referred to as “basal amniotes”, resembled small lizards and evolved from the amphibian reptiliomorphs about 312 million years ago, in the Carboniferous geologic period. Amniotes spread around Earth’s land and became the dominant land vertebrates.
What kind of animals are in the archosaur family?
The archosaurs include modern crocodiles and alligators, and the extinct ichthyosaurs (“fish lizards” superficially resembling dolphins), pterosaurs (“winged lizard”), dinosaurs (“terrible lizard”), and birds. (We should note that clade Dinosauria includes birds, which evolved from a branch of maniraptoran theropod dinosaurs in the Mesozoic.)
When did the first archosaur appear on Earth?
In addition to the dinosaurs (the group from which birds evolved and to which they formally belong), ornithosuchians include pterosaurs and some extinct Triassic forms such as lagosuchids and lagerpetontids. The first known archosaurs appeared in the Middle Triassic Period (about 246 million to 229 million years ago).
Which is the best description of an archosaur?
Archosaur. Archosaur, (subclass Archosauria), any of various reptiles, including all crocodiles and birds and all descendants of their most recent common ancestor. Archosaurs (“ruling reptiles”) are members of a subclass that also includes the dinosaurs, the pterosaurs (flying reptiles), and several groups of extinct forms,…
Which is the second branch of the archosaur family?
The second archosaurian branch, the Ornithosuchia, includes birds and all archosaurs more closely related to birds than to crocodiles. In addition to the dinosaurs (the group from which birds evolved and to which they formally belong), ornithosuchians include pterosaurs and some extinct Triassic forms such as lagosuchids and lagerpetontids.