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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 ]
The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, protists, and other living organisms.This number, along with the visual appearance of the chromosome, is known as the karyotype, [1] [2] [3] and can be found by looking at the chromosomes through a microscope.
Some species have auricles that protrude from the margins of the head. The auricles can contain chemical and mechanical sensory receptors. [14] The number of eyes in the triclads is variable depending on the species. While many species have two eyes (e.g. Dugesia or Microplana), others have many more distributed along the body (e.g. most ...
Order: Tricladida: Superfamily: Planarioidea: Family: ... See text Planariidae is a family of freshwater planarians. The type genus is Planaria Müller, 1776. [1 ...
This list of sequenced animal genomes contains animal species for which complete genome sequences have been assembled, annotated and published. Substantially complete draft genomes are included, but not partial genome sequences or organelle-only sequences.
Some species are well adapted to human-disturbed environments and many of those have been introduced in areas outside of their native range. In some localities, such as the United Kingdom, the number of introduced land planarian species greatly surpass the number of described native species. [21]
In 1955, Eudóxia Maria Froehlich defined that Geoplana vaginuloides would be the type-species of Geoplana, as it was the first species listed by Stimpson. [ 3 ] In 1990, Robert E. Ogren and Masaharu Kawakatsu published a review of the classification of land planarians and divided Geoplana in four genera: Geoplana , Gigantea , Notogynaphallia ...
Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs .