Sunset Cup Coral

Overview

The Sunset Cup Coral (Leptopsammia pruvoti) is a striking, solitary stony coral known for its vibrant yellow or orange polyps. Unlike many reef-building corals, this species is azooxanthellate, meaning it lacks symbiotic algae and does not rely on sunlight for energy.

Distribution & habitat

This species is widely distributed throughout the Mediterranean Sea and along the Atlantic coasts of southern Europe, extending north to the southwestern waters of the British Isles. It is a shade-loving organism that thrives in low-light environments, typically found attached to bedrock, stable boulders, or the walls and ceilings of caves, gullies, and overhangs.

Appearance

The coral polyp sits within a porous, calcareous skeleton that varies in shape from short and cylindrical to tall and inversely conical. It can reach a height of approximately 60 mm and a diameter of 20 mm. The polyp features around 96 long, translucent tentacles that can be fully retracted into the skeletal cup when the animal is disturbed, making them barely visible.

Biology & behavior

Leptopsammia pruvoti is primarily solitary, though it may occasionally form small clusters known as pseudocolonies. It is a slow-growing and long-lived species. Because it does not contain symbiotic algae, it is entirely dependent on capturing food from the surrounding water column to survive, allowing it to flourish in complete darkness.