Which of following is not a class of the phylum platyhelminthes? Trematoda Turbellaria Nemertea Monogenea. Cestoda Which one of the following statements regarding the origin of metazoans has the most support? Ancient metazoans, similar to members of the phylum Placozoa, have been ruled out as ancestral metazoans. The choanoflagellates share features with the sponges, like having collars of surrounding a flagellum and being colonial. These shared features suggest a link to at least metazoan lineage. Metazoans are derived from many separate of unicellular organisms. Modern sponges have a genetic makeup that reflects their ancestral status. The traditional view of cnidarians relative to germ layers is that cnidaria possess two germ layers, ectoderm and endoderm. only one germ layer, the ectoderm, that differentiates into the two tissue layers. two germ layers, ectoderm and mesoderm. definitely all three germ layers including the mesoglea as it is derived from ectoderm. two germ layers, endoderm and mesoderm. Throughout most cnidarian groups, the basal or pedal disc serves to be the base of the tentacles. harbor sensory cells. generate buds. perform extracellular digestion. attach the cnidarian to the substrate. How are schistosomes unique, compared to other trematodes? They strike the rich and the poor, educated and ignorant, alike Infections are easy to cure by drugs surgery All species must cycle through humans to survive They have in their life do they leave the body of the bost larger separate male and female individuals, and the male is larger which of the following is a characteristic of stauromedusans? The planula swims initially and then becomes sessile The top of the polyp has nine extensions Polyps reproduce asexual They have a solitary polyp body They do not have a mouth If a sponge is fragmented and cells are dissociated from one another, the cells will reorganize their structure and function, and clumps of isolated cells will form a new. reproduce sexually. form spicules in the pattern of the cloth. die from being separated. Solution 14] nemertea is not a class of platyhelmenthes Answer = c) Nemertea Nemertea is a phylum not a class is phylum of invertebrate animals also known as ribbon worm or proboscis worm explaination = Phylum Platyhelhelminthes divided into four 4 classes 1] Turbellaria = include mainly free living marine species 2] Monogenea = these are ectoparasites mostly of fish 3] Trematoda = Are internal parasites of mollusca & humans 4] Cestoda = Are internal parasites of vertebrates.