Mediterranean Orange Polyclad Worm

Overview

The Mediterranean Orange Polyclad Worm is a striking, free-living flatworm found in the Mediterranean Sea and temperate regions of the northeastern Atlantic Ocean. This solitary marine invertebrate is known for its vibrant coloration and unique, leaf-like body structure.

Appearance

This species features a thin, broadly oval body that can reach up to 6 cm in length. Its dorsal surface is distinctively orange, decorated with fine white spots and a thin white margin, while the underside is a uniform whitish color. The body is characterized by a thickened central ridge and wavy, lobed edges. At the front, two folds in the body margin serve as sensory tentacles, near which a horseshoe-shaped ring of eyespots and various chemoreceptors are located.

Biology & behavior

These flatworms move by gliding across surfaces using tiny cilia on their ventral side, though they are also capable of graceful swimming through muscular undulations. They are hermaphroditic and reproduce through traumatic, or hypodermic, insemination. A notable biological trait is their remarkable regenerative capacity; if threatened or damaged, they can fragment their bodies and regrow into complete individuals from the remaining sections.

Feeding

As a carnivore, this worm feeds on various small sedentary invertebrates, including tunicates, bryozoans, sponges, and small crustaceans. It detects prey using chemoreceptors and captures food by covering it with its body and secreting a sticky, enzyme-rich mucus. It feeds by projecting its pharynx outward to suck in nutrients, with the same central opening serving as both mouth and anus for the expulsion of waste.