Aplysille Jaune Soufre

Overview

Aplysilla sulfurea is a distinctive encrusting sponge known for its vibrant lemon-to-sulphur yellow coloration. It is a soft, compressible organism that lacks spicules, relying instead on a dendritic skeleton of horny spongin fibers for structural support.

Distribution & habitat

This species has a widespread, nearly cosmopolitan distribution, found across the Atlantic Ocean, the North Sea, the Mediterranean, and various Indo-Pacific regions. It is typically a sciaphilic (shade-loving) organism, commonly inhabiting sheltered environments such as rocky overhangs, crevices, caves, and the undersides of stones. While it can be found in shallow littoral zones, it has been recorded at depths reaching 320 meters.

Appearance

This sponge forms thin, spreading plaques that generally do not exceed 5 mm in thickness. Its surface is characterized by a network of membranous areas and is notably covered in small, irregularly distributed conules—pointed projections created by the underlying skeleton. Several oscules (exhalant pores) are often present, sometimes raised on chimney-like structures.

Biology & behavior

Aplysilla sulfurea is a filter feeder that processes water to extract microorganisms, including bacteria and unicellular algae. It is a hermaphroditic species and reproduces sexually; it is viviparous, meaning the fertilized egg is incubated within the sponge before a ciliated larva is released to settle and develop on a suitable substrate.