Schmidtea mediterranea
| Schmidtea mediterranea | |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Platyhelminthes |
| Class: | Rhabditophora |
| Order: | Tricladida |
| Family: | Dugesiidae |
| Genus: | Schmidtea |
| Species: | S. mediterranea |
| Binomial name | |
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Schmidtea mediterranea Benazzi, Baguñà, Ballester, Puccinelli & Del Papa, 1975 |
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| Distribution of S. mediterranea (Western Mediterranean) |
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| Synonyms | |
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Schmidtea mediterranea is a freshwater triclad that lives in southern Europe and Tunisia. It is a model for regeneration, stem cells and development of tissues such as the brain and germline.
Schmidtea mediterranea is found in some coastal areas and islands in the Western Mediterranean: Catalonia, Menorca, Mallorca, Corsica, Sardinia, Sicily and Tunisia.
High water temperatures (25-27 °C) have deleterous effects on S. mediterranea populations, while variations in the pH of the water (6.9-8.9) don’t seem to have an important influence on the survival of this species.
S. mediterranea can be found with associated fauna such as gastropods, bivalves, insects, leeches, and nematodes.
The sexual specimens of Schmidtea mediterranea produce cocoons between November and April. In May, when water temperature rises above 20 °C, they lose their reproductive apparatus. Despite this, they don’t reproduce asexually (by fissiparity) during the summer months.
Almost any piece from a Schmidtea mediterranea individual can regenerate an entire organism in a few days. This is in part enabled by the presence of abundant pluripotent stem cells called neoblasts.
An analysis of the genome of S. mediterranea indicated the presence of a previously unknown family of long terminal repeats and the lack of several essential genes, including genes responsible for the synthesis of fatty acids and the MAD1 and MAD2 genes, which were thought to be essential components of the spindle assembly checkpoint.
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