Leeches
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ECOLOGY
General Characteristics
Range and Habitat
Ecological Niche
Life Strategy
R vs. K Strategists
Unique Adaptations / Traits
GENETICS
PHYLOGENY/EVOLUTIONARY HISTORY
PHYSIOLOGY
Digestion
Excretion
Special Adaptations
LIFECYCLE
SOURCES
EXCRETION
The excretory system is made up of seventeen pairs of nephridia. Each nephridium includes a horseshoe-shaped gland composed of excretory tissue and is extended by a short excretory duct leading to a bladder.