Common name: Orsak's Flatworm

Scientific name: Maiazoon orsaki Newman & Cannon, 1996
Orsak's Flatworm (Maiazoon orsaki) swimming upon corals of Raja Ampat

General Information

The Orsak's Flatworm, scientifically known as Maiazoon orsaki, is a fascinating marine flatworm that has captured the interest of both scientists and aquarium hobbyists. Known for its distinctively flattened body and undulating edges, this species is often found in coral reef environments, where it plays a role in the complex ecosystem dynamics.

Though not as commonly kept as other marine species, Maiazoon orsaki is appreciated for its unique appearance and intriguing movement patterns. Its presence in an aquarium can add diversity and interest, especially for enthusiasts keen on replicating a natural reef habitat.

Details

Estimated price
Affordable
Recommended minimum tank volume
50 liter (13 gallons)
Salinity
S.G. 1.023 to 1.025
Temperature
24 to 28 °C (75 to 82 °F)
Acidity
pH 8 to 8.4
Average size
5 cm (2″)
Care level
Moderate to easy
Diet
Detritivore Feeds on biofilm, detritus, and organic particles
Reefsafe
Yes
Aggression
Peaceful
Captive bred
No

Taxonomy

  1. Kingdom
    Animals
    Animalia
  2. Phylum
    Flatworms
    Platyhelminthes
  3. Class
    Turbellarians
    Rhabditophora
  4. Order
    Polyclad Flatworms
    Polycladida
  5. Family
    Pseudocerotid flatworms
    Pseudocerotidae
  6. Genus
    Orphek LED Lighting Jellyfish
    Maiazoon
  7. Species
    Orsak's Flatworm
    Maiazoon orsaki Newman & Cannon, 1996
  8. Source: GBIF | Global Biodiversity Information Facility

Care

Caring for the Orsak's Flatworm requires a stable aquarium environment with plenty of live rock and hiding spots. These flatworms are sensitive to changes in water quality, so maintaining stable parameters is crucial. They thrive in well-established tanks where they can graze on biofilm and detritus.

Diet and Feeding

Orsak's Flatworms are detritivores, feeding on biofilm, detritus, and small organic particles found in the aquarium. They do not require supplemental feeding if the tank is mature and well-maintained with a healthy microfauna population.

Behavior and Compatibility

These flatworms are generally peaceful and can coexist with a variety of reef-safe species. However, they should not be housed with aggressive tank mates that might view them as prey. Their slow movement and soft bodies make them vulnerable to predation.

Health and Common Issues

Orsak's Flatworm is relatively hardy but can be susceptible to poor water conditions. Regular monitoring of water parameters and maintaining a clean tank environment will help prevent health issues. Look out for signs of stress, such as lack of movement or disintegration of the body edges.

Habitat

Naturally found in tropical coral reefs across the Indo-Pacific region, the Orsak's Flatworm prefers environments with ample live rock and crevices. They are often seen gliding over substrates in search of food, contributing to the reef's nutrient cycle.