Echinodermata- Acanthaster planci

The organisms found in Phylum Echinodermata possess 5-rayed symmetry, mostly radial, but sometimes bilateral.  Their body has more than two cell layers, with tissues and organs.  The body cavity is a true coelom.  Most organisms possess a through gut with an anus.  The body shape of Echinodermata is highly variable, but has no head.

The nervous system of the organisms includes a circum-oesophageal ring.  The circulatory system is a poorly defined open circulatory system.  The Echinodermata possess a water vascular system, which hydraulically operates the tube fee or feeding tentacles.  The organisms are without excretory organs, but normally possess a subepidermal system of calcareous plates.  The reproduction of the organisms is normally sexual and gonochoristic.  They feed on fine particles in the water, detritus or other animals and all organisms live marine environments.

Examples of organisms found in the Phylum Echinodermata include: Acanthaster planci, Midgardia xandros, Patiriella parvivipara, and Myriotrochus bruuni

Echinodermata- Patiriella parvivipara 

  1.  Ramel, G. (2010). The phylum echinodermata. Retrieved from

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