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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]
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 ...
The complete mitogenome of Caenoplana coerulea is 18,621 bp in length. [7] Its main characteristic is a cytochrome c oxidase subunit 2 gene of unusual length, with a cox2 encoded protein 505 aa in length (compared to about 250 aa in other geoplanids); this characteristic of a very long cox2 is also found in other members of the subfamily Rhynchodeminae, to which Caenoplana coerulea belongs.
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 Turbellaria are one of the traditional sub-divisions of the phylum Platyhelminthes (flatworms), and include all the sub-groups that are not exclusively parasitic.There are about 4,500 species, which range from 1 mm (0.039 in) to large freshwater forms more than 500 mm (20 in) long [3] or terrestrial species like Bipalium kewense which can reach 600 mm (24 in) in length.
When this occurs, the planarian can place its pharynx near the shell without the need for immobilization. [4] In order to ingest snails and large slugs, O. ladislavii pierces the prey's body with its pharynx and sucks its contents, apparently after releasing digestive enzymes. Small slugs may be entirely sucked by the pharynx into the intestine ...
Most adult individuals of B. adventitium are 5–8 cm (2.0–3.1 in) in length. The head is expanded and fan-shaped, being easily distinguishable from other common species of Bipalium, such as Bipalium kewense and Bipalium pennsylvanicum, because these have a head in the shape of a half moon. [1]
Planarian secretory cell nidovirus (PSCNV) is a virus of the species Planidovirus 1, [1] a nidovirus notable for its extremely large genome. At 41.1 kilobases , it is the largest known genome of an RNA virus .