During a recent underwater cleanup posted by Ambjent Malta on their social media page, divers encountered the Mermaid’s Wineglass (Acetabularia acetabulum), a fascinating species of green algae found in Maltese waters.

This unique organism is noteworthy for being one of the largest single-celled organisms in the region. Its scientific name, meaning ‘little vinegar cup’ in Latin, is a nod to its distinct wineglass-like shape.

Typically found at shallow depths between 1-2 metres, the Mermaid’s Wineglass plays a vital role in the marine ecosystem. It often acts as a pioneer species, colonising artificial structures in otherwise barren habitats.

By establishing itself in these areas, it helps create a foundation for more complex ecosystems to develop. Other species, attracted by the algae, are drawn to these environments, where they eventually breed and thrive, forming intricate marine communities.

The discovery of this species during the cleanup highlights the importance of preserving underwater environments. Not only does the Mermaid’s Wineglass contribute to marine biodiversity, but its presence also reflects the health and balance of these ecosystems.

Efforts to protect and maintain marine habitats like these ensure that species such as the Mermaid’s Wineglass can continue to support the rich biodiversity of the Mediterranean Sea.

Have you ever encountered the Mermaid’s Wineglass in Maltese waters?