Sulphur Sponge

Aplysilla sulfurea

Sulphur Sponge is cosmopolitan and can be found encrusting on the exposed sides of coral boulders, particularly in coves and calm waters. It is sessile, meaning it remains fixed in one place, and is often found at depths ranging from the surface down to 300 meters. However, most occurrences are recorded at depths shallower than 40 meters, making it accessible to divers. The Sulphur Sponge has a common length of about 12.5 cm and is characterized by its bright yellow coloration, which can help divers distinguish it from other sponge species. As members of the class Demospongiae, these sponges are hermaphroditic. Their life cycle includes a free-swimming parenchymella larva stage before settling down on a substrate to grow into a young sponge. While diving, encountering a Sulphur Sponge can be an interesting experience, as they contribute to the complex ecosystems of coral reefs. They do not pose any threat to humans and are not evaluated by the IUCN for conservation status.