Some other diploblastic creatures Ctenophores

Attributes of ctenophores Diploblastic Comb jellies--eight rows of ciliated plates Lack “true” nematocysts Active filter feeders Some tentacles, some lack tentacles--tentacles are paired structures planktonic

Triplobastic creatures Platyhelminthes (flatworms)

Characteristics of the Platyhelminthes Triploblastic--ectoderm, endoderm and mesoderm Acoelomate--mesenchymal (separate or syncitial) Gastrovascular cavity depends upon the group--extracellular and intracellular digestion Excretory system of flame cells Some cephalization, nerve net subepidermal. Ladder like set of parallel nerve fibers in the mesoderm

Classes of Platyhelminthes Turbellaria--marine and freshwater, free-living--one opening gut Trematodes--parasitic, marine and freshwater--one opening gut Cestoda--parasitic, marine and freshwater--lack a digestive tract