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Thick-arm Jellyfish


Spaghetti Worms Requiem sharks

The thick-arm or 'fat-arm' jellyfish are a family of over 20 jellyfish species. These jellyfish have domed bells reaching upward of 40 cm in diameter. Members of this family have eight short arms surrounding the mouth. The arms are three-sided.

These jellyfish swim in jerks by contracting their circular and radial muscles,. They have no control over the direction of locomotion and drift with the currents.

1 species found on this page.

Sea Tomato

Crambione mastigophora

Sea Tomato (Crambione mastigophora) @ Koh Haa

Crambione mastigophora @ Koh Haa

The Sea Tomato is one of eight edible jellyfish species found in the eastern Indian Ocean.

This species can weigh up to 2.8 kg and the umbrella can reach 27 cm in diameter. There are eight main arms, each with 8 - 11 marginal lappets (hanging pieces of flesh). Each marginal lappet is relatively wide, with a rounded margin.

The Sea Tomato has 8 mouth arms which are the same, or slightly longer than the umbrella diameter.

Each mouth arm has several appendages, numerous long, narrow and filamentous, and a single small, club-shaped appendage.

The Sea Tomato can cause an annoying and painful, but not life-threatening sting.

Find Out More: Marine Life References and Further Information

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Diving with Thick-arm Jellyfish

Spot Thick-arm Jellyfish around Koh Lanta on one of our high season dive and snorkel trips.

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