![]() Nine species have been found or are likely to occur outdoors in Pennsylvania other speices might be found in heated, indoor spaces such as greenhouses. ![]() At least fifteen species occur in eastern North America, 2–4 of which are native, with the rest being introduced from elsewhere. Land planaria are most common and diverse in tropical regions worldwide but are also found in temperate areas. Some species have distinctive half-moon or crescent-shaped heads, while others have pointed heads. Elsewhere in the world, land planaria can be brightly colored, including reds, pinks, greens, and blues, as well as having stripes and other striking color patterns. Species in North America are typically yellow or orange with dark stripes to dark brown or black. Land planaria, which are also called terrestrial flatworms (and some of which are called hammerhead worms), are flattened, small to large worm-like animals that live in moist, terrestrial environments. Order: Tricladida (planaria, free-living flatwoms)įamily: Geoplanidae (land planaria, terrestrial flatworms) General information Description Common names: land planaria, terrestrial flatworm, hammerhead flatworms ( Bipalium species only)
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