Éponge Cornée Noire

Overview

Scalarispongia scalaris is a marine sponge endemic to the Mediterranean Sea. It typically forms massive, globose, or cushion-like colonies that are recognized by their distinct black coloration.

Appearance

The sponge has a soft, slightly compressible texture and a characteristic rugose surface covered in small, widely spaced conules—pointed projections measuring 1 to 2 mm in height. Its oscula, or exhalant openings, are relatively small and often situated within smooth, shallow depressions on the upper surface of the colony. Internally, the species is defined by a highly regular, ladder-like skeletal network of spongin fibers, where primary and secondary fibers intersect at right angles. This unique structural arrangement is the origin of its scientific name.

Distribution & habitat

This species is found throughout the Mediterranean Sea. It prefers shaded, low-light environments and is frequently observed attached to rocky walls, within crevices, or inside marine caves.