エダハナガササンゴ

Overview

Goniopora columna is a colonial stony coral known for its distinct, column-like skeletal structure. It is a common species across the Indian and Pacific Oceans, often forming large, monospecific stands in sheltered or turbid environments.

Distribution & habitat

This species is widely distributed throughout the Indo-Pacific, including the Red Sea, the Persian Gulf, Southeast Asia, and Australia. It typically inhabits shallow, tropical waters, such as lagoons and sandy areas, and is frequently found in turbid conditions where it can thrive at depths between 2 and 15 meters.

Appearance

The colony develops into short, oval-shaped columns. When fully extended, the large, flower-like polyps—each featuring 24 tentacles—can mask the underlying skeletal structure. These polyps often display a wide range of colors, including brown, green, or yellow, frequently accented by a contrasting white or pale oral cone. When disturbed, the polyps retract, revealing the solid, stony corallites beneath.

Biology & behavior

Goniopora columna is a reef-associated coral that relies on symbiotic zooxanthellae for energy through photosynthesis. It also supplements its nutrition by capturing zooplankton with its tentacles. The species is considered near-threatened and is known to be somewhat aggressive, as its polyps can be venomous to other nearby corals.