![]() ![]() (Think that’s weird? Check out this this self-decapitating sea slug.) Though egg cases have been found, reproduction seems to be primarily done through “fragmentation: a small rear portion of the worm will pinch off, and ‘stay behind’ as the worm moves forward.”Ī new head begins to form within about 10 days and the entire process may happen a few times each month. However, the Texas Invasive Species Institute notes that sexual reproduction has not been observed. When a hammerhead worm is cut in half, it’s possible that the halves may grow into two worms, according to the Iowa State University agricultural department. ![]() But it is thought that because the worms are hermaphroditic, meaning they have both male and female parts, they can reproduce by fragmentation. Some species are believed to be poisonous.Īlso called the shovel-headed worm or broadhead planarian, the terrestrial flatworm is not technically immortal, as the tweet claims. “during the early 1900s in soil on the roots of horticultural plants.” Today, there are at least four of the Bipalium species varying in lengths from 1.5 to 12 inches. The first such worms are thought to have been brought to the U.S. ![]()
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