starfish anatomy, detailed close-up of a starfish's unique exoskeleton, revealing its intricate structure and compl

starfish exoskeleton anatomy closeup detailed structure design orange white marine ocean sea animal invertebrate wildlife nature biology zoology scientific macro texture pattern color vivid hues intricate complex creature underwater coral reef life seashore beach shells star echinoderm radial symmetry body plan ossicles dermal branchiae papulae pedicellariae tube feet water aquatic habitat environment