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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 ]
Planaria is a genus of planarians in the family Planariidae. Due to its excellent ability to regenerate, species of Planaria has also been used as model organisms in regeneration studies. [ 1 ] When an individual is cut into pieces, each piece has the ability to regenerate into a fully formed individual. [ 2 ]
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Bipalium is a genus of large predatory land planarians. They are often loosely called "hammerhead worms" or "broadhead planarians" because of the distinctive shape of their head region. Land planarians are unique in that they possess a "creeping sole", a highly ciliated region on the ventral epidermis that helps them to creep over the substrate ...
Land planarians are carnivorous and most species are active predators, but some are mainly scavengers. [22] All planarians feed through a muscular and eversible pharynx located slightly posteriorly to the middle of the body length and opening through a ventral mouth. The pharynx is an extensible tube-like organ bearing a complex muscular coat.
The eye cup in Dugesiidae is composed of several retinal cells, while in other freshwater planarians they are composed of a single cell. [4] All freshwater planarians have an accessory organ called copulatory bursa or bursa copulatrix, which is connected to the genital atrium by a canal. In Dugesiidae, the oviducts, which conduct the eggs from ...
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The subfamily Geoplaninae was initially defined by Ogren and Kawakatsu (1990) [4] for land planarians which have a broad creeping sole, mouth in the second half of the body, dorsal testes, subepithelial longitudinal musculature well developed and parenchymal longitudinal musculature absent or not well developed. The eyes contour the anterior ...