Chiropsalmus quadrumanus: Atlantic Box Jellyfish

Species profile · Last reviewed 22 August 2026

Chiropsalmus quadrumanus is a multi-tentacled box jellyfish of the western Atlantic. It occurs on the opposite side of the world from Australia’s Chironex fleckeri, a reminder that medically significant cubozoans are not confined to the Indo-Pacific.

Appearance

Branching pedalia at the four bell corners carry multiple tentacles, placing the species among the chirodropids. Transparent tissue and variable preservation make expert confirmation important. A common name such as “sea wasp” does not reliably distinguish it from relatives.

Range

Verified records are from warm western Atlantic coastal waters, including parts of the Gulf of Mexico, Caribbean and South American Atlantic coast. Exact occurrence and season should be checked with local monitoring rather than inferred from the full regional range.

Human-risk context

Stings can be medically significant, particularly after extensive tentacle contact or in a small child. Immediate severe pain, breathing difficulty, collapse or whole-body symptoms require emergency services. Regional first-aid advice should take precedence over an Australian protocol copied without context.

Why records need vouchers

Western Atlantic box jellyfish have a history of broad identifications and changing names. A preserved specimen, diagnostic anatomy and molecular data make a record much more useful than a photograph labeled only “box jellyfish.”

Sources

• NOAA National Ocean Service: box jellyfish
• World Register of Marine Species
• Smithsonian Ocean

Medical content is editorially source-checked; independent clinical review is pending.