A planarian is one of many flatworms of the traditional class Turbellaria. It usually describes free-living flatworms of the order Tricladida (triclads), although this common name is also used for a wide number of free-living platyhelminthes. Planaria are common to many parts of the world, living in both saltwater and freshwater ponds and rivers. Some species are terrestrial and are found under logs, in or on the soil, and on plants in humid areas.
Dugesia is a genus of dugesiid triclads that contains some common representatives of the class Turbellaria. These common flatworms are found in freshwater habitats of Africa, Europe, Middle East, Asia, and Australia. Dugesia is best known to non-specialists because of its regeneration capacities.
Geoplanidae is a family of flatworms known commonly as land planarians or land flatworms.
Schmidtea mediterranea is a freshwater triclad that lives in southern Europe and Tunisia. It is a model for regeneration, stem cells and development of tissues such as the brain and germline.
Dugesiidae is a family of freshwater planarians distributed worldwide. The type genus is Dugesia Girard, 1850.
Girardia is a genus of freshwater planarians belonging to the family Dugesiidae.
Schmidtea is a freshwater triclad genus widely used in regeneration and developmental studies.
Dugesia notogaea is a species of dugesiid triclad that inhabits freshwater bodies of north Queensland, Australia.
Dugesia aenigma is a species of dugesiid triclad that inhabits freshwater bodies of Cephalonia, Greece.
Dugesia sicula is a species of dugesiid triclad that lives in freshwater bodies of the Mediterranean Basin, where it is widely distributed. It has been reported from Sicily, Elba and Mallorca, Eivissa, Sardinia, Algeria, Tunisia, Morocco and Crete.
Dugesia japonica is a species of dugesiid triclad that inhabits the freshwater bodies of East Asia. Because it is under the genus Dugesia, it is also sometimes considered a type of planarian.
Dugesia sagitta is a species of dugesiid triclad that inhabits the rivers of Corfu, Greece. The specimens of this species are up to 10 millimetres (0.39 in) long and 3 millimetres (0.12 in) wide.
Cura is a genus of freshwater flatworm (triclad) belonging to the family Dugesiidae.
Microplana is a genus of land planarians found in Europe and Africa.
Neppia is a genus of dugesiid triclad that is found in South America, Subantarctic region, Africa, Tasmania and New Zealand.
Dugesia artesiana is a species of dugesiid triclad found in Queensland, Australia.
Dugesia arcadia is a species of freshwater dugesiid found in northern Peloponnese, Greece.
Bdellocephala is a genus of freshwater triclad that inhabits different regions of Eurasia.
Geoplaninae is a subfamily of land planarians endemic to the Neotropical region.
The reproductive system of planarians is broadly similar among different families, although the associated structures can vary in complexity.
