Button Star

Nardoa variolata

Button Stars are echinoderms characterized by their distinctive star-shaped bodies. They can be recognized by their rounded arms and the unique patterns on their surface. These patterns can vary, helping divers distinguish them from similar species in the region. Generally, they inhabit the tropical waters of the Western Indian Ocean, often found in association with coral communities. They thrive in shallow depths, typically between 5 and 15 meters, but can be located in waters less than 30 meters deep. In their natural habitat, Button Stars are primarily benthic, residing on the ocean floor. They feed on organic matter and small invertebrates, playing a role in the ecosystem by helping to recycle nutrients. Their life cycle and reproductive behaviors are not extensively documented, but like many echinoderms, they likely engage in external fertilization, releasing eggs and sperm into the water column during spawning events. Encountering a Button Star while diving can be a serene experience. These creatures are generally harmless and can often be seen resting on the substrate, blending into their surroundings. Divers should approach gently to avoid disturbing them, as they can be shy and may retract their arms when threatened. The conservation status of Button Stars has not been evaluated, indicating a lack of comprehensive data on their populations and threats.