Rough Leather Coral

Overview

Sarcophyton glaucum, commonly known as the Rough Leather Coral, is a widespread soft coral species found throughout the Red Sea and the Indo-Pacific region. It is highly regarded for its resilience and distinct mushroom-like appearance, making it a prominent inhabitant of reef flats, lagoons, and seaward slopes.

Distribution & habitat

This species is native to the western Indian Ocean, the Red Sea, and the western Pacific Ocean, extending as far as Polynesia. It typically thrives in shallow reef environments at depths ranging from 1 to 30 meters, where it attaches to rocky or coral substrates.

Appearance

Characterized by a thick, sterile stalk and a broad, flared, mushroom-shaped top, this coral can grow to significant sizes. Mature colonies often develop an irregular, lobed, and folded margin, which may overlap and obscure the stalk. The body is generally beige, brownish, or pinkish, while the polyps—which feature eight tentacles—can exhibit greenish hues. The surface is typically smooth, though the coral can retract its polyps entirely to take on a sleek, compact form.

Biology & behavior

S. glaucum lives in symbiosis with microscopic algae called zooxanthellae, which provide essential nutrients through photosynthesis. To maintain its health and surface cleanliness, the colony periodically secretes a protective mucus film that is shed as the polyps retract. The species is dioecious, meaning individual colonies are either male or female, and it reproduces through a synchronized, brief annual spawning event.

Feeding

While it relies heavily on its symbiotic algae for energy, the coral also actively captures zooplankton from the water column, particularly at night, using its specialized autozooid polyps.