What Are Their Veertebrate Characteristics

Sharks do not have skeletons, but just cartilage. Also their jaws can move independently without any of their other body parts. It allows them to have a stronger hold on their prey. Sharks have oil in their liver that allow them to eat less often. So when they eat us up, they must be really hungry. Their fins help them feel vibrations of other creatures so that they can get into position to pounce on their prey.

The robust australopithecines or paranthropines had a curved face with a arch for the cheek bones that are formed by connecting the zygomatic and the temporal bones together. The robust australopithecines had a bone ridge on top of their skull called a sagittal crest, which is also attached to the jaw muscles. They had a flexable base just above were their jaw bone connected to their cheek bone. With their really large back teeth (below the cheek bone) the robust australopithecines fossils were known to the researchers as the “nutcracker man”. They used these really large back teeth to eat tough foods and nuts. And their teeth in the front were smaller.

3a. Body more than five times as long as broad; front edge of dorsal fin far

This organism causes the sharks to go blind. Luckily Greenland sharks are mainly scaevngers and heavily rely on their heighted sense of smell.

1. Neil Shubin, author of Your Inner Fish, and his colleagues travel to Ellesmere Island to look for and study the shift from fish living in water to creatures living on land (4). Fossils from 360 million years ago include amphibians and reptiles. Fossils 385 million years old, only fish are found. Because of this, Shubin and his colleagues look at the time in the middle of this, 375 million years ago (10). In 2004, they give it another try, after failed previous tries (21). What gradually emerges from the rocks they searched for in the bottom of the quarry is an “intermediate” right between fish and land animals, Tiktaalik, “large freshwater fish” (22-25).

At the beginning of the Jurassic era, two hundred and thirteen million years ago, the initial 'modern' sharks were testing the hybodonts. The new sharks had extra flexible jaws that were capable of thrusting frontwards, providing them with a distinct advantage in the struggle for food. The hybodont ancestry started to end, and sharks amazingly similar to current species began to take over.

gills sprouting small feather-like appendages. Although colloquially known as a ‘walking fish’, it is in fact

Analysis of teeth function in G. vogtlensis further supports the claim that large prey were

Identifying Features- Typically 4 to 6 feet, and 660 to 1,100 pounds. Skin is primarily black, with varying pale spots and a pinkish-white underbelly. Lacks a hard shell but instead has a carapace composed of tough, rubbery skin and thousands of tiny bone plates Its carapace is large, elongated and flexible with 7 distinct ridges running the length of the animal. Front flippers lack claws or scales and back flippers are paddle-shaped.

With a very slim frame it has much less water resistance allows to dive and swim with much less effort and energy. This will give it a lighter mass allowing it to also to move faster land as well while grazing. If the Hydrochoerus caudatus was slower on land it would make them easy prey for animals like boa constrictor or the florida panther

The lower jaw was big and a chin was developed. It had small incisors on the upper and lower jaws for nipping the vegetation.

Blacktip Reef sharks are unique organisms that appear as the way their name describes it. The sharks have black tips on its caudal and dorsal fins, as well as angled saw-like teeth and a round and small snout. Other fins that this fish has is its two pectoral fins, pelvic fin, and an anal fin. These sharks can grow to be six to seven-feet long and have white bellies and dark backs, this allows the shark to disguise itself with the obscured seafloor and the lighter ocean surface.

The fossil of Tiktaalik confirmed a major prediction of paleontology in that it showed characteristics of both aquatic animals, such as fish, and land animals, such as reptiles and amphibians. While it had fins and scales, it also had a flexible neck, a flat head, and complex bone structure in its fins that correspond with the structure of the legs of terrestrial animals. Thus, it demonstrates the evolutionary transition between aquatic and terrestrial life.

Their bodies are also shaped somewhat like a torpedo to give them a more streamlined affect in the in water. Yet, some types of sharks, the ocean dwellers have a flat body similar to that of skates and rays. Sharks can travel with great bursts of speed especially when attacking their prey or when excited. The fastest-swimming sharks have a moon-shaped tail that provides extra power and durability for swimming.

Within the suborder of Caniformia, Ursidae are one of nine families. The Ursidae differs from similar families in several ways: the presence of an alisphenoid canal, paroccipital processes that are large and not fused to the auditory bullae, auditory bullae are not englard, the lacrimal bone is vestigial, the cheek teeth are bunodont and hence indicative of a broad, hypocarnivorous diet. In addition, organisms within the family of Ursidae possess posteriorly oriented M2 postprotocrista molars, elongated m2 molars, and a reduction of the premolars. The earlier members of Ursidae belonged to the extinct subfamily known as Amphicynodontinae. The earliest members of the family were small and raccoon-like, in contrast to today’s larger