Dark-Marked Scaleworm

Lepidonotus melanogrammus

Dark-marked Scaleworm is a benthic species found in coastal and inshore habitats, typically inhabiting the continental shelf. It is recorded in the Northwest Pacific, particularly in the Taiwan Strait, and can be found at depths ranging from 0 to 30 meters. This species is characterized by its dark markings, which help distinguish it from similar polychaetes. Observers should look for its elongated body and distinct color patterns when identifying this worm during dives. As a carnivorous organism, the Dark-marked Scaleworm feeds on small invertebrates, contributing to the benthic ecosystem's dynamics. Its reproductive behavior involves a unique swarming process where females release pheromones to attract males, prompting them to shed sperm. This behavior leads to fertilization and the development of eggs, which may become planktonic or be retained within protective structures like tubes or jelly masses. Diving encounters with the Dark-marked Scaleworm can be intriguing, as they often blend into their surroundings. Divers may spot them resting on the substrate or emerging from their tubes. While they are harmless to humans, their presence indicates a healthy marine environment. The species has not been evaluated by the IUCN, so its conservation status remains unknown.