Four-handed Box Jelly

Overview

The Four-handed Box Jellyfish (Chiropsalmus quadrumanus) is a venomous species of box jellyfish recognized by its distinct cube-shaped, transparent bell. While often found in warm, open seas, these jellyfish can occasionally appear inshore in large numbers, posing a significant risk to swimmers. Their sting is highly painful and can be dangerous, particularly to children, with documented cases of severe envenomation.

Appearance

This species features a robust, smooth, and colorless bell that reaches approximately 14 centimeters in diameter. Its common name is derived from the four palmate, hand-like structures located at the bottom corners of the bell. Each of these "hands" supports multiple tentacles—often 7 to 9 per corner—which can extend up to 3 or 4 meters in length. The tentacles are typically transparent, though some may exhibit a pale mauve or yellowish-white hue.

Distribution & habitat

Chiropsalmus quadrumanus has a broad, pantropical distribution, including the western Atlantic Ocean, the Gulf of Mexico, and parts of the Pacific Ocean. It is commonly reported along the east coast of North America, from North Carolina through Florida and the Gulf states, as well as in the Caribbean and coastal waters of Brazil. While primarily an inhabitant of warm, open marine environments, it is known to move into coastal areas during specific conditions, such as rising tides or calm weather.

Biology & behavior

Unlike many other jellyfish that drift passively with currents, this species is an active, fast swimmer capable of purposeful movement. It possesses 24 eyes distributed across its bell, providing it with 360-degree vision to navigate and avoid obstacles. Its diet consists primarily of small crustaceans and fish, which become entangled in its long, venom-laden tentacles as the jellyfish swims.