Glove Sponge

Overview

The Glove Sponge (Spongia officinalis) is an iconic marine sponge historically harvested for its soft, absorbent skeleton. It plays a significant role in Mediterranean marine ecosystems, though its populations have faced pressure from over-harvesting and disease.

Distribution & habitat

This species is primarily found throughout the Mediterranean Sea and parts of the nearby Atlantic Ocean. It typically inhabits hard, rocky substrates, though it may occasionally be found attached to seagrass rhizomes. While it can be found in shallower waters, it is most commonly observed at depths between a few meters and 40 meters, becoming increasingly rare at greater depths.

Appearance

Spongia officinalis typically grows in massive, globular, or lobed forms that can reach diameters of up to 40 cm. Its surface is characterized by numerous small, cone-shaped projections known as conules, which give the sponge a distinct "goosebump" texture. The color is highly variable, ranging from light grey to black, or occasionally yellowish-white, depending on light exposure. It features prominent, often raised oscules (exhalant openings) that are frequently surrounded by a lighter-colored ring.

Biology & behavior

This sponge is composed of a dense, complex mesh of primary and secondary fibers. It reproduces both sexually and asexually through processes like budding or fragmentation. Individuals may be dioecious or sequential hermaphrodites, releasing free-swimming, lecithotrophic larvae that eventually settle on a suitable benthic surface to begin their slow growth.