Platyhelminthes - Species that belong to the phylum Platyhelminthes are commonly known as flatworms. The nervous system of Platyhelminthes is relatively simple compared to other phylums nervous systems. Platyhelminthes have 2 brains known as Ganglion or Ganglia as the plural form. Platyhelminthes have 2 eyespots/holes that help them detect and sense light. Their nervous system picks up and senses its surrounding causing its muscles to contract accordingly. Its nerves are vital for movement, finding food and mates along with escaping predators. They have ventral nerve cords which are 2 nerve cords that run down their body.
Flatworm - The nervous system of the flatworm consists of nerve nets that are connected by long nerve cords. These cords are connected to cerebral ganglia located in the head region. Flatworms have "auricles" that project from the side of the head. These auricles contain chemoreceptors that
are used to find food. Flatworms also have eyespots called "ocelli". The ocelli are sensitive to light and are connected to the cerebral ganglia. Generally, the flatworm avoids light.
Tapeworm - Tapeworms lack a central nervous system. The tapeworm essentially completely has lost its nervous system due to its adaptation to parasitic life.
Fluke - The nervous system of a Fluke worm consists of a pair of anterior ganglia, or nerve centres, and usually three pairs of lengthwise nerve cords.
Flatworm - The nervous system of the flatworm consists of nerve nets that are connected by long nerve cords. These cords are connected to cerebral ganglia located in the head region. Flatworms have "auricles" that project from the side of the head. These auricles contain chemoreceptors that
are used to find food. Flatworms also have eyespots called "ocelli". The ocelli are sensitive to light and are connected to the cerebral ganglia. Generally, the flatworm avoids light.
Tapeworm - Tapeworms lack a central nervous system. The tapeworm essentially completely has lost its nervous system due to its adaptation to parasitic life.
Fluke - The nervous system of a Fluke worm consists of a pair of anterior ganglia, or nerve centres, and usually three pairs of lengthwise nerve cords.