1. 15 Plicate carpel 6 ~ initiated in a whorl simultaneously.

2. Male shoots (Androecia) on lateral branches, of 3–6 pairs of imbricate (overlappping) bracts that are concave, otherwise similar to leaves; perianths obovoid, weakly plicate, mouth unlobed, with long, uniseriate cilia

3. Other articles where Polycladida is discussed: flatworm: Annotated classification: Order Polycladida Pharynx simple, Bulbose, or plicate (many ridges); intestine may have short diverticula, or pockets; protonephridia paired; testes usually numerous; penis papilla generally present; nervous system with 3–4 trunks; nearly 800 species