Encheliophis

Encheliophis is a genus of oviparous (egg-laying) marine fish belonging to the family Carapidae, commonly known as pearlfish or snailfish. These fish are characterized by their elongated, eel-like bodies, which are often transparent or translucent, and their lack of pelvic fins. Their dorsal and anal fins are continuous with the caudal fin, giving them a sinuous swimming style. The genus name "Encheliophis" derives from Greek words meaning "eel snake," reflecting their serpentine appearance.

Members of the genus Encheliophis are primarily found in tropical and subtropical waters of the Atlantic, Indian, and Pacific Oceans. They are often associated with deep-sea environments and are known for their commensal or parasitic relationships with other marine invertebrates, particularly sea cucumbers and echinoderms. Some species inhabit the body cavities of their hosts, feeding on gonads or other soft tissues, while others may live in close association without direct harm to the host. Their specialized lifestyle has led to unique adaptations, including the absence of a swim bladder and the ability to feed on specific parts of their hosts.