Which group of Kingdom Animalia has unsegmented, bilaterally symmetrical, soft bodies, with a triploblastic construction (comprising three layers of cells) and a lacking coelom, skeleton and anus?

Explanation

Platyhelminthes is the group described in this introductory body-plan comparison. Flatworms are triploblastic acoelomates with bilateral organization and no true metameric segmentation. The digestive tract, when present, is typically incomplete; tapeworms lack a digestive tract.