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Most of the sexual production is done by cross fertilization (both species fertilize each other).
The fertilized eggs are stored within the flatworm, and are either reserved in the parent or laid as egg masses.
Some freshwater flatworms produce special overwintering eggs, which are kept within the parent through winter.
Asexual reproduction occurs when there are no mating partners or when there are harsh environment conditions. This usually occurs by one of two methods;
The first method is through budding; the buds grow out along the length of the parent's body, forming chains until they are ready to separate into new individuals.
The second method is called transverse fission; the posterior half of the worm attaches itself to the substrate while the anterior half continues to move forward until the two halves pull apart. Each half regenerates to form a complete worm. A few species can actually fragment themselves into several pieces, each of which regenerates to form several small worms.
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