A black Hammerhead Worm spotted in Khao Yai National Park. Its name derives from its crescent-shaped head. These slug-like creatures are predatory and prey mostly on earthworms, or some on mollusks.

it is also nicknamed Sticky Worm, as it will use its muscles and a sticky secretions to attach itself to its prey to prevent it from escaping. See also List of Thai Insect Names.