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Phylogeny of Leeches (Hirudinea) Based on Mitochondrial CytochromecOxidase Subunit I.

62793 Phylogeny of Leeches (Hirudinea) Based on Mitochondrial CytochromecOxidase Subunit I. http://dx.doi.org/10.1006/mpev.1997.0455 The authors investigated the phylogenetic relationships of leeches with molecular data. Biology > Biota > Fauna > Annelida > Hirudinea Jan 1, 1998  

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Other links at Biology > Biota > Fauna > Annelida > Hirudinea

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This page states that leeches are among the most highly specialized of the annelids. They are predominantly freshwater organisms, although there are marine and terrestrial forms. Leeches are highly specialized predators that feed on blood.
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Photographs of various species from the North Pacific and the Ukraine.
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