Largebrain Root Coral

Overview

Lobophyllia hemprichii, commonly known as the Largebrain Root Coral, is a prominent species of large-polyp stony coral found throughout the Indo-Pacific region. It is a resilient, reef-building species that often plays a significant role in the structural complexity of coral reef ecosystems.

Appearance

This coral typically forms flat to hemispherical mounds that can grow to impressive sizes, sometimes exceeding five meters in diameter. Its skeletal structure is phaceloid to flabello-meandroid, characterized by irregularly dividing valleys and septa that taper toward the center with tall, sharp teeth. When the polyps are retracted, they appear thick and fleshy with either smooth or rough mantles. Colonies exhibit a range of colors, appearing either uniform or featuring concentric patterns of multiple hues around the valley walls and mouths.

Distribution & Habitat

This species is widely distributed across the tropical and subtropical Indo-Pacific, ranging from the Red Sea and the east coast of Africa through the Indian Ocean to the central Pacific, including Australia, Indonesia, and Japan. It is primarily found on upper reef slopes and fore-reef slopes, where it can form extensive, sometimes dominant, single-species stands or composite assemblages.

Biology & Behavior

Lobophyllia hemprichii is a photosynthetic coral that relies on symbiotic zooxanthellae for energy. It is noted for its ability to thrive in diverse conditions, including both clear offshore waters and more turbid coastal environments, as it can actively clear sediments from its polyps. While it is generally considered a hardy species, it is moderately aggressive and can extend sweeper tentacles at night to sting nearby corals if they are placed too close.