Monostilifera

order of worms Monostilifera (Monostilifera) is an order comprising closely related families of organisms. It contains 6 families with 7 known species. This includes the family groups Acteonemertidae, Amphiporidae, Carcinonemertidae, Malacobdellidae, Prostomatidae, and Tetrastemmatidae. Among its members, 1 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to Hoplonemertea (Hoplonemertea).