Polyplacophora

class (Polyplacophora) of marine molluscs Polyplacophora (Polyplacophora) is a class of organisms united by key anatomical and physiological traits. It contains 3 orders with 10 known species. This includes the order groups Callochitonida, Chitonida, and Lepidopleurida. Among its members, 1 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to Mollusks (Mollusca).