Tetrapod

aquatic life, we must first understand the origin of tetrapods. By definition, the word tetrapod translates to four feet, and includes all species that have four feet. However, some species without four feet are classified as tetrapods as well because they all descended from a common ancestor, linking together the evolution of the physiology in amphibians, reptiles and mammals. For example, the snake is a tetrapod even though it has no limbs. Tetrapods themselves evolved from an aquatic, finned organism

was the advancement of the tetrapod, a vertebrate animal with

Abstract:      The early tetrapods were the first vertebrates to actually walk the solid earth. They began their conquest of land in the Paleozoic era around 360 million years ago. The question many paleontologists have been asking for a long period of time is whether the anatomy for locomotion on land was developed in water for swimming purposes, or if it was adapted after the creatures became terrestrial. Recent findings of fossils indicate that the transformations of

a bone and a tail unlike any existing fish. They also possessed four fleshy fins which extend outwards like limbs and arrange in alternating pattern. The movement of their paired fins is like the movement of forelegs and hind legs of tetrapod moving on land. Coelacanth also has intracranial joint and hinge in the skull which enables them to open their mouth very wide for consumption of very big prey. Coelacanths have a notochord which is filled with oil with a

period was Tiktaalik, one of the missing links in Earth’s history, and terribly hard to find. Tiktaalik probably lived in the lush rainforests and swamps of the early Devonian. Up until several years ago, people thought that links between fish and tetrapods was impossible, until they found Tiktaalik. ("First Fossil of Fish That Crawled onto Land Discovered." Sign in to Read:. N.p., n.d. Web. 30 Mar.

Growing up, nothing has been more interesting to me than the animal world. Animals vary in size and shape, they adapt to specific environments, and they all have unique relationships with one another. These things fascinate me. I can’t determine when this obsession grew in me but I can remember my four year old self, drawing every animal I can think of, from moose to flamingos. I would watch nature documentaries whenever I could find them on while flipping through the channels on the television.

The picture of the cover of the magazine features Tiktaalik, a creature that is intermediate between fish and primitive land-living animals. Tiktaalik has fish-like characteristics with scales on its back as well as fins with fin webbing. However, it also has a flat head and a neck similar to early land-living animals. Inside the fin, one can also see bones that correlate with the parts of the wrist, forearm, and upper arm. All of this is inside a fin with webbing. Shubin once dissected

Description Neophocaena phocaenoides asiaeorientalis otherwise known as the Yangtze finless porpoise is one of the three recognised subspecies of the finless porpoise and is the only subspecies that resides in freshwater. Found up to 1,600 kilometres from the sea in the Yangtze River, this particular subspecies is the only porpoise species that lacks a true dorsal fin. Instead, it is replaced by a low ridge with small bumps running down the middle of the back that is covered with thick skin. The

Two of the frog’s main external structures are its nose/nostrils and its eyes. Two of its internal structures are its tongue and lungs. The eyes are relatively small, they are about the size of a blueberry. They are a dark shade of blue, along with being squishy and moist. The eyes have a clear and retractable membrane called the nictitating membrane. This allows the frog to see under water. The eyes are retractable themselves, which helps the frog swallow food whole and push it down. The nostrils

Taylor Cormier Paqutte English 5097 8W1 “See You Later Alligator, In a While Crocodile” Now it’s perfectly understandable to confuse gators and crocs (the animals, not the shoes). They have a Staggering amount of similarities, it’s very easy to give into the urges to reference the two interchangeably. They both are very large reptiles, hailing from the order Crocodylia, easily weigh A ton, and dawn the traditional dry scaly skin. They even tend to have a very similar dark greenish-brown color. While