Common name: Euphyllia Yaeyamaensis

General information

Euphyllia yaeyamaensis, commonly known as the Branching Hammer Coral, is a large polyp stony (LPS) coral that is highly sought after in the reefkeeping hobby for its unique appearance and movement. It is closely related to the more commonly known Euphyllia ancora, but can be distinguished by its branching growth form as opposed to the wall-like structure of E. ancora.

Care

The Yaeyamaensis Hammer Coral requires moderate to high lighting and moderate water flow to thrive in a reef aquarium. It is important to provide ample space between it and other corals to prevent aggression, as it can extend its sweeper tentacles at night to sting nearby corals. Stable water parameters are crucial for its health, and it benefits from the addition of calcium, magnesium, and alkalinity supplements to support its skeletal growth.

Symbiosis

While not known for hosting fish, Euphyllia yaeyamaensis can have a symbiotic relationship with certain marine invertebrates, such as commensal shrimp, which may reside within its tentacles for protection and to scavenge for food.

Habitat

Euphyllia yaeyamaensis is found in the Indo-Pacific region, particularly around the Ryukyu Islands and Taiwan. It typically inhabits reef slopes and lagoons where it can anchor to the substrate and extend its tentacles to capture planktonic food from the water column.