Nicknamed as the “hammerhead slug” due to its half-moon shaped head, Bipalium kewense is not your everyday flat worm. Not only does it hold the record for world’s largest flatworm but it’s also one of the few flatworms that live on land. Oh, did I mention that it defecates from its mouth?
image credit: News Update
The hammerhead slug is believed to originate from Southeast Asia. However, it appears that the species has become cosmopolitan with recordings coming from many different tropical and subtropical countries. It’s especially common in greenhouses, thus its second common name, the “greenhouse planarian”.Watch the video to see one!
Fully mature adults routinely reach 40 cm (10 in) in length, with the maximum recorded length being about 60 cm (23 in). The body is covered by a layer of mucus that prevents it from losing too much water to the environment. The mucus is also important for locomotion.
One of the species’ weirdest traits is the half-moon shaped head. The mouth is located mid-way down the body (on the ventral side) which also serves as the.. anus since they don’t have one. Yum! They also have no respiratory and circulatory system, skeleton and legs.