Which characterstic is NOT possesed by the phylum Annelida?

Step-by-step solution

Characteristic of phylum Annelida: They exhibit an organ-system level of body organisation and bilateral symmetry. They are triploblastic, metamerically segmented and coelomate animals. Their body surface is distinctly marked out into segments or metameres and, hence, the phylum name Annelida (Latin, annulus: little ring). A closed circulatory system is present. Nephridia (sing. nephridium) help in osmoregulation and excretion. The neural system consists of paired ganglia (sing. ganglion) connected by lateral nerve