Sea Star Anatomy Part 1 

External anatomy of a sea star. Phylum Echinodermata, Class Asteroidea.
Initial steps of the dissection process are also explained.
Part 2: Internal anatomy, can be found here: • Sea Star Anatomy Part 2
This video was made by the teaching assistant (C. Ernst) for the students of Organisms II at McGill University, but is appropriate for any introductory-level zoology program.
Organisms II, 2012