Echinomdermeta is commonly known as starfish, they are phylum of invertabrates. Their unique shape are very distinctive in that it helps us identify them. A starfish has 5 rayed symmetry and is mostly radial. The body contains two cell layers. The coelem or body cavity has a circulatory system that is not closed. The legs has holes twhere the water vascular system help it reproduce sexually. The starfish feeds from very fine organisms and food from the water such as algae and other small fish. They have a nervous system that includes a circum-oesophageal ring but no excretory organs.
Crinoidea
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