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A three-branched intestine runs across almost the entire body, and includes a single anterior and two posterior branches. The planarian intestine is a blind sac, having no exit cavity, and therefore planarians uptake food and egest waste through the same orifice, located near the middle of the ventral body surface. [5]
The genus Kontikia includes planarians of elongate body, with a creeping sole that occupies one to two thirds of the body width. The mesenchymal musculature includes well-developed longitudinal muscles forming a ring zone around the intestine. [2]
Microplana is a genus of land planarians found in Europe and Africa. [1] Description ... connecting the intestine to the female atrium. [2] Ecology
Dendrocoelum lacteum, the milk-white planarian, is a freshwater planarian found in lakes and running waters in Europe, being the most widespread freshwater planarian in this continent. Description [ edit ]
The subfamily Microplaninae was defined by Ogren and Kawakatsu (1988) [2] for land planarians with a short and cylindroid form, an anterior end that is blunt, eyes often small and subepithelial musculature weak. The male copulatory apparatus is often complicated and has a well-developed penis.
The tribe Anzoplanini contains land planarians with dorsoventral testes, a condition that in land planarians is considered intermediate between a primitive ventral condition and a derivate dorsal condition. The mesenchymal musculature contains longitudinal fibers forming either a ventral plate or a ring around the intestine. [2]
Alejandro Sanchez-Alvarado and Philip Newmark transformed planarians into a model genetic organism in the beginning of the 20th century to study the molecular mechanisms underlying regeneration. [12] Morgan found that a piece corresponding to 1/279th of a planarian [ 11 ] or a fragment with as few as 10,000 cells could regenerate into a new ...
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 ...