Aplacophora or Solenogasters

 

• The body is cylindrical or bilaterally symmetrical.

• These are devoid of the head, shell, mantel, nephridia, and foot.

• The digestive ceca is absent.

• Spicule-bearing cuticle covers the body.

• It contains a dorsal longitudinal keel or crest.

• E.g. Neomenia, Chaetoderma