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Echinoderms, with their endoskeleton and 5-part radial symmetry, stand out as deuterostomes, sharing similarities with humans. The water vascular system, exclusive to echinoderms, plays a key role in respiration, circulation, and movement. This system is found in groups like sea urchins, sand dollars, brittle stars, sea cucumbers, sea stars, and sea lilies. Dive into the world of these mesmerizing marine creatures!
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Echinoderm Characteristics • Endoskeleton – inside body • 5-part radial symmetry in most • Deuterostome • Being deuterostomes and having endoskeltons make them much more like us than any other invertebrates
Water Vascular System • Unique to echinoderms • Water is taken in through tube feet in rays (arms), pumped to center, and then back out. • This system carries out respiration, circulation, and movement.
Groups of Echinoderms • Sea urchins & sand dollars • Brittle stars • Sea cucumbers • Sea Stars (star fish, but they’re not fish) • Sea lilies and feather stars