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Xenoturbella Bocki
The nervous system of the xenoturbella bocki is a diffuse nerve with no brain. The flatworm falls within the bivalve molluscs family of flatworms because the similarities in the subtle appearance of the eggs and larvae. During the early stages of development, the worm has a bivalve system, which is a hard shell. This disappears as the worm develops.
Turbellaria
The turbellaria species of flatworm was discovered in the Baltics preserved as a fossil in amber that was 40 million years old. The body of the fossilized worm contains a cavity that consists of developing eggs or capsules. Turbellarias are considered by many scientists as being the most simple form of bilaterally symmetrical animals. The flatworm mainly lives in freshwater, and doesn't need a host body for survival. Some have adapted to live on land.
Pork Tapeworm
The pork tapeworm can infest your nervous system. This can cause neurocysticercosis, which is a main cause of epileptic seizures. The worm is infamous in third-world countries and is becoming more prevalent in developed countries due to immigration. Remedies include steroids and surgery. When the tapeworm infests the human brain, antiparasites can be taken, though there is a risk these can damage the brain.
Planarian
Planarians, also called dugesia, are native to freshwater. They are more developed than most of its relatives and has a simple brain and nervous system. The worm has two eyes and they can regrow body parts. Planarians are mainly scavengers.
Fluke
Flukes have a complicated life cycle that usually involves navigating to more than one host. Part of the fluke's life is spent in a snail, and then they infect other animals such as humans when they are caught swimming in water that contains snails. The eggs are passed by human waste and then are transferred to water where they once again find a snail host.