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Histological, histochemical and bacteriological methods were used to study digestion and the digestive enzymes in nine species of leech.
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The local distribution and relative abundance of the leeches of the E. S. George Reserve in southeastern Michigan were investigated.
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A term paper on leeches, some of the most loathed and degraded invertebrates around?
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Analytical Chemistry. Classified links of the Chemistry Biology Information Center of ETH Zürich.
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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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Phylum Annelida Introduction Annelids (segmented worms) are extremely successful and have invaded terrestrial, freshwater, and marine habitats. They include familiar forms such as earthworms and leeches and many diverse marine organisms.
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These are the most highly developed helminths, having segmented bodies, a circulatory system, nephridia (part of a primitive excretory system, but still much more advanced than the flame cells of, for example, the Platyhelminthes), a highly developed digestive system, and a primitive brain.
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