![]() ![]() In contrast, tetrapods can lay eggs (oviparous), have live births (viviparous), or retain eggs inside the body until they hatch (ovoviviparous), depending on the species and the environment. Others are ovoviviparous, keeping eggs inside the body until they hatch. Some species of sharks are oviparous, laying eggs that are fertilized and then left to develop on their own. In contrast, the skin of tetrapods can be dry or moist and may have scales or fur, which provides protection and insulation. This allows for more efficient movement and helps to conserve energy. The skin of sharks is usually moist and lacks scales, which reduces friction and drag in the water. In contrast, tetrapods have limbs that are adapted for movement on land and in water but may also have specialized structures such as flippers or webbed feet. ![]() These fins include the dorsal, pectoral, pelvic, and caudal fins. Sharks have specialized fins that allow for efficient movement and maneuvering in the water. In contrast, tetrapods have fewer teeth that are adapted for specific functions, such as chewing or biting but are not replaced as frequently. This allows them to maintain a sharp, efficient set of teeth for capturing and eating prey. Sharks have multiple rows of teeth that are constantly being replaced throughout their lives. Tetrapods, on the other hand, have four limbs adapted for various locomotion modes, such as walking, running, swimming, or climbing. Sharks do not have limbs, which are adaptations for movement on land or in water. In contrast, tetrapods extract oxygen from the air through the lungs, which are specialized organs that exchange gases between the bloodstream and the atmosphere. Sharks extract oxygen from the water through gills, which are specialized structures that filter water over a network of capillaries. In contrast, tetrapods have a bony skeleton that provides more support and protection but is heavier and less flexible. Cartilage allows for more efficient movement in the water but is not as strong as bone. Sharks have a skeleton made of cartilage, which is lighter and more flexible than bone. Here are all the reasons why sharks are not tetrapods. Sharks possess a lateral line system, while tetrapods lack this sensory organ.įurthermore, while most tetrapods reproduce by laying eggs with external fertilization (outside the body), most shark species use internal fertilization, where the male inserts sperm into the female’s reproductive organs for fertilization.īecause these animals differ in so many ways, both anatomically and physiologically, it is clear that sharks cannot be considered part of the same taxonomic group as tetrapods. Sharks have gill slits rather than lungs for respiration, while tetrapods breathe air through their lungs. In addition to this significant difference in anatomy between sharks and tetrapods, there are several other distinctions between these two classes of animals. As a result of this difference in skeletal structure, sharks do not possess any four-limbed appendages or limbs. This class includes amphibians, reptiles, birds, and mammals whose bones are made out of bone tissue instead of cartilage. On the other hand, Tetrapods are from the Osteichthyes class, which evolved from Chondrichthyes. However all tetrapods are vertebrates, but all vertebrates are not necessarily tetrapods. ![]() ![]() Yes, they are, but they are not tetrapods. These fishes make up the vast majority of marine creatures and include other species, such as skates, rays, and chimaeras.ĭon’t think sharks are not vertebrates. Instead, they belong to the Chondrichthyes class, a group of fishes with cartilaginous skeletons and fins supported by rays. In this article, I will do a deep dive into the details to remove all the confusion, including an analysis of what class sharks actually belong in. Most shark species have eight fins instead. Well, sharks aren’t tetrapods because they don’t have limbs like whales and other tetrapods. Most people get confused and think that sharks and whales are both tetrapods. ![]()
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