Echinodermata
The Echinodermata phylum consists of organisms such as sea urchins, starfish, and Bohadschia Argus otherwise known as the sea cucumber. Echinodermata means spiny skinned in the original Greek. The entire phylum only exists inside of the ocean without any species on land or fresh water. Regardless, it is still the second largest phylum in the ocean behind the Mollusca. It has a diverse group of species of about 70,000.
This phylum does not exactly have a muscular system. The Phylum has a similar trait common in almost all of its species. The vascular system actually acts as a way for movement for these creatures. Inside of the sea urchins, starfish, and Bohadschia Argus there vascular system is there only form of movement and closest thing to a muscle.
The vascular/ muscular system acts first as a gas exchange and feeding and secondarily as mode of transportation. Inside each organism are canals extending out to the arms and throughout other parts of the body. The redistribution of this fluid causes the animal to either extend or contract their limbs.
This is useful for animals such as sea urchins because by being able to move this small amount they can attain food that attempts to settle on them through their mouths.
Some starfish also use this to their advantage. When buried the starfish do this to poke their heads out of the sand and attain oxygen from the water.
This phylum does not exactly have a muscular system. The Phylum has a similar trait common in almost all of its species. The vascular system actually acts as a way for movement for these creatures. Inside of the sea urchins, starfish, and Bohadschia Argus there vascular system is there only form of movement and closest thing to a muscle.
The vascular/ muscular system acts first as a gas exchange and feeding and secondarily as mode of transportation. Inside each organism are canals extending out to the arms and throughout other parts of the body. The redistribution of this fluid causes the animal to either extend or contract their limbs.
This is useful for animals such as sea urchins because by being able to move this small amount they can attain food that attempts to settle on them through their mouths.
Some starfish also use this to their advantage. When buried the starfish do this to poke their heads out of the sand and attain oxygen from the water.