Nemerteans and Turbellaria (Phylum Plateyhelminthes): Comparison of Reproductive Systems Abstract Nemerteans and the Plateyhelminthes class turbellaria are very similar in appearance. But on closer investigation they are quite different in structure. If the reproductive systems are examined, it is found that they are different in many ways. The first major difference is that nemerteans are mostly dioecious and turbellaria are monoecious. Another difference is that external fertilization usually takes place in nemertean species and opposed …
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