Echinodermata contains many variations of marine animals. These marine animals are also known as echinoderms. This includes animals such as sea cucumbers, starfish, and sea urchins. They can be found at any depth in the sea. Echinoderms are known for there ability to regenerate tissues, organs , and limbs.
Sea Cucumber
Sea Cucumbers belong to the subphylum of echinozoa. When a sea cucumber consumes an object it passes through the pharynx into the stomach and then passes into the intestines. This is where nutrients are absorbed and nitrogenous waste diffuse through the walls and are expelled through the rectum in forms of ammonia as they do not create urine.
Sea Cucumbers belong to the subphylum of echinozoa. When a sea cucumber consumes an object it passes through the pharynx into the stomach and then passes into the intestines. This is where nutrients are absorbed and nitrogenous waste diffuse through the walls and are expelled through the rectum in forms of ammonia as they do not create urine.
Starfish
Starfish are found in the subphylum of asterozoa. They have no distinct excretory organs; waste ammonia is removed by diffusion through the tube feet and papulae. The body fluid contains phagocytic cells, coelomocytes, these cells engulf waste material, and eventually migrate to the tips of the papulae, where a portion of body wall is nipped off and ejected into the surrounding water. Some waste may also be excreted by the pyloric glands and voided with the feaces.
Starfish are found in the subphylum of asterozoa. They have no distinct excretory organs; waste ammonia is removed by diffusion through the tube feet and papulae. The body fluid contains phagocytic cells, coelomocytes, these cells engulf waste material, and eventually migrate to the tips of the papulae, where a portion of body wall is nipped off and ejected into the surrounding water. Some waste may also be excreted by the pyloric glands and voided with the feaces.
Sea Urchin
Sea urchins are in the subphylum echinozoa. When a sea urchin opens its Pharynx it consumes its food and then the food runs through the esophagus into the stomach and through the intestine. In the intestine the tubules diffuse nitrogenous wastes through the walls and then the wastes are expelled through the rectum as ammonia.
Sea urchins are in the subphylum echinozoa. When a sea urchin opens its Pharynx it consumes its food and then the food runs through the esophagus into the stomach and through the intestine. In the intestine the tubules diffuse nitrogenous wastes through the walls and then the wastes are expelled through the rectum as ammonia.