Planarians (triclads) are free-living flatworms of the class Turbellaria, [2] [3] order Tricladida, [4] which includes hundreds of species, found in freshwater, marine, and terrestrial habitats. [5] Planarians are characterized by a three-branched intestine, including a single anterior and two posterior branches. [ 5 ]

Paludicola Tricladida, the freshwater planarians, sometimes brackish water, is divided into three families: Dugesiidae, Planariidae, and Dendrocoelidae (Gardiner, 1972).

Tricladida (triclads) is an order of turbellarians, a group of free-living flatworms. They are also known as planarians, although this common name is also used for a wide number of free-living platyhelminthes.

May 2, 2022 · Order: Tricladida (planaria, free-living flatwoms) Family: Geoplanidae (land planaria, terrestrial flatworms) Land planaria, which are also called terrestrial flatworms (and some of which are called hammerhead worms), are flattened, small to large worm-like animals that live in moist, terrestrial environments.

Primarily free-living, planarians are characterized by a soft, broad, leaf-shaped (when elongated) body with cilia and a three-branched digestive tract (as reflected in the name Tricladida). Planarians or triclads are widely distributed, common, and diverse.

Feb 18, 2020 · Tricladida are among the best known and most fully studied of the non-parasitic Platyhelminthes. They can be found in both marine and freshwater habitats and there are also a few terrestrial species which can be found in damp or very humid soils.

Planariidae is a family of freshwater planarians. The type genus is Planaria Müller, 1776. [1] Twelve genera of Planariidae are known: [2] Phylogenetic supertree after Sluys et al., 2009: [2] ^ Ball IR: A contribution to the phylogeny and biogeography of the freshwater triclads (Platyhelminthes: Turbellaria).

Apr 4, 1998 · Here we analyse the phylogeny and classification of the Tricladida, with additional, independent, molecular data from complete sequences of 18S rDNA and 18S rRNA. We use maximum parsimony and neighbour-joining methods and the characterization of a unique gene duplication event involving the Terricola and the dugesiids to reconstruct the phylogeny.

Feb 6, 2014 · Planarians are a group of free-living platyhelminths (triclads) best-known largely due to long-standing regeneration and pattern formation research. However, the group’s diversity and evolutionary history has been mostly overlooked.

Within the free-living platyhelminths, the triclads, or planarians, are the best-known group, largely as a result of long-standing and intensive research on regeneration, pattern formation and Hox gene expression.