Holothuroidea are a class of marine animals (phylum Echinodermata) with an elongated body and leathery skin, which's found on the sea floor worldwide. Many holothurian species and genera, informally known as sea cucumbers, are targeted for human consumption. The harvested product's also known as trepang, bêche-de-mer, balate, or sea slug. The body contains a single, branched gonad. Like all echinoderms, sea cucumbers have an endoskeleton just below the skin, calcified structures that're us… (More on Holothuroidea)