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| There are several types of Planaria |
Dugesias: are the most commonly found planaria in eastern Canada. They have arrow-shaped heads. They are brown like the mud around them, and may be blotched with black or brown, mottled white and brown, or have a light-colored line down the center of the body. They can be as large as 2.5 cm long. They suck the fluids from tiny dead or living animals. Some dugesias eat hydras and then place the hydra's sting cells on their own surface for protection.
Catenulas: are less than 1.2 cm long. They are usually about 0.5 cm long. They have slender, whitish bodies with separate units or sections in a chain. Their heads are small and rounded. They can be found in stagnant water where the greater surface area of their slim bodies allows them get more oxygen from the water. They also suck fluids from tiny animals in the pond like the dugesias.
Procotylas: are only 0.25 to 0.8 cm long and whitish in color. They are wider for their size than other Planaria with large sucking mouths. Their heads are almost straight across or blunt. They suck in tiny animals or animal fluids to feed. On their heads they have 2 to 7 tiny eyes.
This relates to our topic of planaria because it informs us of the many types of planarian, and lets us decide which one to use.
These are the top 3 types of planarian that exist. Where are using Brown Planaria, because they are the most common and reasonable size for our experiment.