GeoChemBio.com/biology/organisms/Schmidtea mediterranea (planarian)

 

Untreated planarians
Untreated planarians

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Schmidtea mediterranea

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Nemose

Taxonomy

Planarians are members of the phylum Platyhelminthes and sharewith vertebrates key traits such as bilateral symmetry, three germ layers (ectoderm, mesoderm and endoderm), and dorsoventral and anteroposterior polarities. Planarians are also among the simplest bilaterians to display cephalization - a complex accumulation of neurons in their anterior region. These characteristics have attracted the attention of a long succession of zoologists, and the taxonomic history and classification of the flatworms have been of considerable controversy.

Taxonomic lineage

cellular organisms - Eukaryota - Fungi/Metazoa group - Metazoa - Eumetazoa - Bilateria - Acoelomata - Platyhelminthes - Turbellaria - Seriata - Tricladida - Paludicola - Dugesiidae - Schmidtea - Schmidtea mediterranea

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Planarian anatomy

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Brief facts

Basic morphology/anatomy

Tissue pasticity

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Life cycle

Schmidtea mediterranea exists as both sexual worms that reproduce as cross-fertilizing hermaphrodites and asexual worms that reproduce strictly by transverse fission.

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Tissues

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References

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