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Introduction to Echinoderms: Unique Features and Reproductive Strategies

Echinoderms, commonly known as spiny-skinned animals, possess distinct features such as well-developed organ systems and a water pumping system with internal canals. They exhibit bilateral symmetry in their larvae but maintain radial symmetry as adults. These fascinating creatures have a coelom and an endoskeleton. Reproduction occurs both sexually and asexually, with many species showing regenerative capabilities. Echinoderms can filter-feed or actively hunt prey by prying open shells with their tube feet and digesting them with enzymatic fluid.

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Introduction to Echinoderms: Unique Features and Reproductive Strategies

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  1. Echinoderms

  2. Basic Features • Spiny skinned animals • Spines project through thin skin • Well developed organ systems • Water pumping system w/ internal canals • Tube feet at ends

  3. Tube Feet

  4. Tube Feet

  5. Basic Features • Coelum • Radial symmetry • Larvae = bilateral • Closest vertebrate relative • Development similar to chordates • Endoskeleton

  6. Larval Pictures (Bilateral Symmetry)

  7. Closest Relative

  8. Reproduction • Sexual • Most have separate male/female sexes • Gametes released into water • Asexual • Regeneration: regrowing lost body parts

  9. Feeding • Some filter feed • Some active predators • Pry open shells using tube feet • Stomach releases enzymes to liquify the prey • Fluid is sucked up

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