Phantom Nudibranch

Melibe colemani

The Phantom Nudibranch (Melibe colemani), also known as Coleman's Melibe or the Ghost Melibe, is an extraordinary nudibranch belonging to the family Tethydidae. Its nearly transparent body and intricate internal structures make it one of the most unusual subjects in tropical underwater macro photography. A Body That Almost Disappears The animal's transparent body wall reveals an elaborate network of cream-white to pale brown digestive-gland branches. These interconnected structures resemble fine threads, delicate lace or miniature branching trees. Along the sides of its body are several pairs of flattened, wedge-shaped cerata edged with slender papillae. Their distinctive shape is an important feature for distinguishing Melibe colemani from closely related species, including Melibe engeli. The cerata can detach easily, making careful, non-contact observation especially important. An Unusual Feeding Strategy Unlike many nudibranchs that feed on sessile organisms, Melibe colemani captures small mobile prey using a specialized oral hood. The hood opens and sweeps across the surrounding substrate, enclosing small crustaceans and other invertebrates before directing them toward the mouth. This remarkable feeding mechanism is characteristic of the genus Melibe. Habitat and Camouflage Melibe colemani has been documented in tropical waters around Malaysia, Indonesia and the Philippines. The original type specimen was collected at Mabul Island, Malaysia, where it was found concealed within a colony of Briareum soft coral. Its transparent body and delicate branching structures allow it to blend remarkably well into its surroundings. Soft-coral habitats may provide important observation clues, but association with coral should not be confused with evidence that the animal feeds on