28.5: Superphylum Deuterostomia Last updated Mar 6, 2021 Save as PDF 28.4D: Subphyla of Arthropoda 28.5A: Phylum Echinodermata Page ID13706 BoundlessBoundless ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy28.5A: Phylum Echinodermata28.5B: Classes of EchinodermsEchinoderms consist of five distinct classes: sea stars, sea cucumbers, sea urchins and sand dollars, brittle stars, and sea lillies.28.5C: Phylum Chordata