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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]
Tasmanoplana is a genus of land planarians from ... The parenchymal musculature includes very strong and compact longitudinal fibers forming a ring around the intestine.
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 ]
Each fragment develops into a mature, fully grown individual. Fragmentation is seen in many organisms. Animals that reproduce asexually include planarians, many annelid worms including polychaetes [17] and some oligochaetes, [17] turbellarians and sea stars. Many fungi and plants reproduce asexually.
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 ...
Currently, the genus Geoplana is characterized by having the features described by Ogren & Kawatasu (dorsal testes, a protrusible penis and a female canal entering the genital antrum dorsally) plus several others, such as a slender body with nearly parallel margins, a strongly convex dorsum, monolobulated eyes (i.e., simple and circular, with only one lobe), and a strong muscle tube around the ...