Éponge Catalane Rouge À Cratères

Overview

Hamigera hamigera is a marine sponge characterized by its fleshy, encrusting form and vibrant red coloration. It is primarily found in the western Mediterranean, where it thrives in various rocky environments and on the rhizomes of seagrass.

Appearance

This sponge typically forms thick, fleshy crusts that can cover significant surface areas. Its surface is smooth and glossy, featuring numerous circular or polygonal orifices surrounded by small, distinct rims. The oscules, which serve as the primary exit points for water, are located atop small, raised elevations on the sponge's surface. Due to its visual similarity to other red encrusting sponges, such as Phorbas topsenti, definitive identification often requires microscopic examination of its skeletal spicules.

Distribution & habitat

Hamigera hamigera is endemic to the western Mediterranean, with notable populations reported near the French coast, particularly around Banyuls-sur-Mer, as well as in parts of Corsica, Tunisia, and the Adriatic Sea. It is a photophilic species, commonly found in well-lit areas such as horizontal rock surfaces, crevices, and cave entrances. It also frequently colonizes the rhizomes of Posidonia seagrass.

Biology & behavior

Like other sponges, Hamigera hamigera is a filter feeder. It maintains a constant flow of water through its porous body wall to extract oxygen and essential nutrients from the surrounding environment. It is a long-lived organism, with some individuals potentially surviving for over a century, growing at a rate of approximately 2 cm per year.