Sea cucumbers are members of the phylum Echinodermata

Can you guess what you're looking at?Is it a fuzzy sock? An overripe banana? A moldy tube of toothpaste?In fact, this is the humble sea cucumber, and while it might look odd,its daily toil paves the way for entire ecosystems to thrive.Sea cucumbers are members of the phylum Echinodermata,along with sea urchins, starfish and other radially symmetrical,piny-skinned marine invertebrates.