Echinodermata
Echinodermata are a phylum of animal most recognizable by a set of characteristics they may possess. These characteristics are calcitic skeletons composed of many ossicles (small bone like joint plate), a water vascular system, mutable callagenous tissue, and pentaradial body organization in adults. It is also noted that all Echinoderms live in the ocean and no fossil evidence has been found otherwise.
Reproduction of Echinoderms usually occurs sexually and externally, producing free floating larvae that feed on unicellular algae. The larvae are plesiomorphically bilaterally symmetrical, have a recurved gut and transparent ectoderm. Their metamorphosis are very radical and after the metamorphosis they settle onto the benthos, or the layer of sea organisms that live on the seafloor. The benthos includes but is not limited to starfish, oysters, clams, sea cucumbers, brittlestars and anemone
Reproduction of Echinoderms usually occurs sexually and externally, producing free floating larvae that feed on unicellular algae. The larvae are plesiomorphically bilaterally symmetrical, have a recurved gut and transparent ectoderm. Their metamorphosis are very radical and after the metamorphosis they settle onto the benthos, or the layer of sea organisms that live on the seafloor. The benthos includes but is not limited to starfish, oysters, clams, sea cucumbers, brittlestars and anemone