Dalyellia viridis is a species of rhabdocoel flatworm in the family Dalyelliidae.
Description The animal is usually colored intensively green due to zoochlorellae. It is 2.5 to 4 mm long with a rounded anterior and pointed posterior end. It possesses a pair of kidney-shaped eyes. Mature animals carry many eggs in their body.
Taxonomy It was described in 1791 by George Shaw as Hirudo viridis.
Distribution and habitat It occurs in freshwater in stagnant waterbodies. It is most frequently found in temporary pools.
Ecology and behavior The animal harbors symbiotic green algae (zoochlorellae) of the species Chlorella vulgaris in its body. It feeds on algae and animals, including microturbellarians.
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