![]() Sexual planaria are hermaphrodites, possessing both male and female organs and able to lay eggs. Some larger terrestrial species eat earthworms by wrapping around them, secreting mucus to dissolve their prey. Planaria are carnivores, feeding on a variety of smaller invertebrates such as shrimp and water fleas in aquatic habitats, or other small worms. It is unknown how many species of planaria exist globally, although there are thought to be 12 species in the UK, alongside invasive non-native species introduced from other parts of the world. Historically, planaria were classified by their ‘ecotype’, or where they occurred, as there are species that live on land in terrestrial ecosystems, freshwater ecosystems, or in marine ecosystems. ![]() AboutPlanaria, or planarian flatworms, are thought to be very primitive creatures as they only possess a ladder-like nervous system. ![]()
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