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Planarians are bilaterian flatworms that lack a fluid-filled body cavity, and the space between their organ systems is filled with parenchyma. [5] [13] Planarians lack a circulatory system, and absorb oxygen through their body wall. They uptake food to their gut using a muscular pharynx, and nutrients diffuse to internal tissues.
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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 ]
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.
Geoplaninae is a subfamily of land planarians endemic to the Neotropical region. [ 1 ] [ 2 ] Members of this family are sometimes referred to as the Neotropical land planarians . However, one species, Obama nungara has been introduced in Europe .
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 ...
Species of Girardia are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. [1] One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall.
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