Blue-Spotted Shield Slug

Chelidonura livida

Chelidonura livida is a distinctive sea slug characterized by its black or dark brown body adorned with bright blue spots or rings. This species can reach lengths of about 10 to 50 mm, making it relatively small compared to other marine creatures. Divers can identify it by its unique coloration, which sets it apart from similar species in the Aglajidae family. Its markings serve as a warning to potential predators about its unpalatable nature. This headshield slug inhabits the tropical waters of the Indo-West Pacific, specifically in regions such as the Red Sea, Madagascar, and extending to northern Australia and the Philippines. It prefers sandy environments, often found on intertidal shallow sand flats where it can easily blend into the substrate. The species is typically encountered at various dive sites. As an active predator, Chelidonura livida primarily feeds on flatworms, utilizing its specialized adaptations to hunt in its sandy habitat. Members of the order Cephalaspidea, to which this species belongs, are generally hermaphroditic, allowing them to reproduce effectively in their environment. Encountering this slug during a dive can be an interesting experience, as divers may observe it gliding across the sand, showcasing its unique coloration and behavior. The conservation status of Chelidonura livida has not been evaluated by the IUCN, leaving its long-term viability in its natural habitat uncertain. However, its presence in numerous dive sites suggests it is not currently considered rare.