Tree Anemone

Actinodendron arboreum

The tree anemone, scientifically known as Actinodendron arboreum, is a sea anemone species found in the Indo-Pacific region. It is often recognized by its unique appearance, with an oral disc displaying radiating stripes from the mouth, and tentacles that resemble a broccoli due to their fractal branching. These tentacles can grow up to 20 centimeters long and are arranged in whorls, with the first whorl containing six tentacles. This species is highly venomous, and its sting can cause severe skin ulcers, earning it the alternative name 'hell's fire anemone.' Tree anemones inhabit tropical waters and are typically found at depths of up to 28 meters, although most occurrences are shallower than 10 meters. They are sessile creatures, attaching themselves to the seabed. The reproductive process involves the release of gametes into the water column, where fertilization occurs. The resulting planula larvae are part of the plankton before settling on the seabed to undergo metamorphosis into juvenile anemones. Encounters with tree anemones can be hazardous due to their venomous nature, so divers should maintain a safe distance. The conservation status of this species has not been evaluated by the IUCN.