Common name: blue dragon nudibranch

General information

The Blue Dragon Nudibranch, scientifically known as Pteraeolidia ianthina, is a strikingly beautiful sea slug that captures the attention of many marine enthusiasts. This species is known for its vibrant blue and purple hues, along with its elongated body and numerous cerata, which resemble the mythical dragon's spines. These cerata not only serve an aesthetic purpose but also function in respiration and defense.

Care

Caring for Pteraeolidia ianthina in a reef aquarium requires attention to water quality and diet. They thrive in stable, well-oxygenated environments with low nitrate levels. It's crucial to provide them with a supply of hydroids, their natural prey, which can be challenging to maintain in captivity. Without these, the nudibranchs may starve, making them suitable only for advanced hobbyists who can meet their dietary needs.

Reproduction

Blue Dragon Nudibranchs are hermaphrodites, possessing both male and female reproductive organs. They can self-fertilize or mate with another individual. After mating, they lay spiral ribbons of eggs on substrates. The larvae are planktonic before settling down and transforming into their adult form.

Symbiosis

An interesting aspect of Pteraeolidia ianthina is its relationship with photosynthetic zooxanthellae. The nudibranchs incorporate the algae from their hydroid prey into their own tissues, a process known as kleptoplasty. This symbiotic relationship allows the nudibranchs to derive energy from photosynthesis, supplementing their diet and contributing to their vibrant coloration.

Habitat

Pteraeolidia ianthina is commonly found in the Indo-Pacific region, from the shallow waters of the Red Sea to the coasts of Australia and Japan. They are typically seen in coral reef environments, where they can blend in with the colorful surroundings and have access to their preferred prey, hydroids.