Phylum

Common name: Flatworms

Scientific name: Platyhelminthes

Platyhelminthes, commonly known as flatworms, are a fascinating group of invertebrates characterized by their flattened, soft bodies. These organisms are found in a variety of environments, including marine, freshwater, and terrestrial habitats. In the context of marine aquariums, flatworms are often considered both a curiosity and a concern, depending on the species. Some flatworms are harmless and can even be beneficial as part of the clean-up crew, helping to control algae and detritus. However, certain species, such as those from the genus Convolutriloba, can become pests, rapidly reproducing and covering corals, which can lead to stress and damage to the coral colonies.

Flatworms exhibit a range of colors and patterns, making them visually interesting additions to an aquarium, but their presence needs to be managed carefully. They have a simple body structure with no specialized circulatory or respiratory systems, relying on diffusion for these functions. This simplicity allows them to regenerate lost body parts, a trait that is particularly fascinating to both scientists and hobbyists.

In a reef aquarium, it is vital to identify the species of flatworms present to determine whether they pose a threat. Some aquarists use natural predators, such as certain species of wrasses, to control flatworm populations. Chemical treatments are also available, but they must be used with caution to avoid harming other marine life. Understanding the balance and role of flatworms in the aquarium ecosystem can lead to more effective management and a healthier tank environment.

  1. Marine Blue Flatworm (Cycloporus venetus)
    Common name: Marine Blue Flatworm
    Scientific name: Cycloporus venetus
  2. Common name: Flatworm
    Scientific name: Leptoplana tremellaris
  3. Orsak's Flatworm (Maiazoon orsaki) swimming upon corals of Raja Ampat
    Common name: Orsak's Flatworm
    Scientific name: Maiazoon orsaki
  4. Common name: Alcino's Flatworm
    Scientific name: Notoplana alcinoi
  5. Persian Carpet Flatworm (Pseudobiceros bedfordi) - Palau
    Common name: Persian Carpet Flatworm
    Scientific name: Pseudobiceros bedfordi
  6. Common name: Damawan Flatworm
    Scientific name: Pseudobiceros damawan
  7. Cerise flatworm (Pseudoceros ferrugineus) Showing its Colors
    Common name: Fuchsia flatworm
    Scientific name: Pseudobiceros ferrugineus
  8. Marine flatworm - Pseudobiceros fulgor. Macro underwater world of Tulamben, Bali, Indonesia.
    Common name: Pseudoceros fulgor
    Scientific name: Pseudobiceros fulgor
  9. Pseudoceros ferrugineus, the Fuchsia flatworm, is a marine flatworm species that belongs to the Pseudocerotidae family
    Common name: Glorious Flatworm
    Scientific name: Pseudobiceros gloriosus
  10. Cryptic flatworm
    Common name: Camouflaged flatworm
    Scientific name: Pseudobiceros kryptos
  11. Common name: Pseudoceros uniarborensis
    Scientific name: Pseudobiceros uniarborensis
  12. Common name: White and orange edge flatworm
    Scientific name: Pseudoceros hancockanus
  13. Common name: Pillar Tailed Flatworm
    Scientific name: Stylochus pilidium