Genus
Common name: Green Bonellia
Scientific name: Bonellia
Bonellia is a genus of marine echiuran worms, known for the striking sexual dimorphism in its species. The females are large and green, with a long proboscis, while males are tiny and live parasitically within the female's body. In the aquarium, they are a rare sight, often associated with deep sand beds or live rock. They are detritivores, helping to break down waste and aerate the substrate. Their unique biology and behavior can add a fascinating aspect to a diverse reef ecosystem, but they are not commonly kept due to their specialized needs and rarity.