marine animals  |
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Orthonectida (Orthonectida) Orthonectida |
Orthonectida (Gr.: straight swimmers) are a small phylum of the animal kingdom, comprising only about 25 species, with an uncertain phylogenetic position. They are secondarily simplified tissue animals from the Bilateria. |
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root  |
Orthonectida (Orthonectida) Orthonectida |
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