Platyhelminthes Phylum
The Platyhelminthes phylum is known for its flatworms, stemming from the name in Greek. These worms have bilateral symmetry and have no circulatory or respiratory organs, therefore they rely on diffusion to receive oxygen and nutrients and have flat and soft bodies. Their nervous system ranges from species to species, but has some common characteristics. Firstly, all Platyhelminthes have a ganglion, or simplified brain. Secondly, all of these organisms have at least one nerve cord running down the length of their body. This cord controls response and movement for the entire organism. Some Platyhelminthes have eyespots that can detect light and movement to help them better suit their environment.
The Platyhelminthes phylum is known for its flatworms, stemming from the name in Greek. These worms have bilateral symmetry and have no circulatory or respiratory organs, therefore they rely on diffusion to receive oxygen and nutrients and have flat and soft bodies. Their nervous system ranges from species to species, but has some common characteristics. Firstly, all Platyhelminthes have a ganglion, or simplified brain. Secondly, all of these organisms have at least one nerve cord running down the length of their body. This cord controls response and movement for the entire organism. Some Platyhelminthes have eyespots that can detect light and movement to help them better suit their environment.