Polycelis nigra (wiki)
Kingdom: Animalia
Phylum: Platyhelminthes
Class: Acentrosomata
Order: Tricladida
Family: Planariidae
Genus: Polycelis
Species: nigra
Date: 2018-04-22
Place: 50.227748, 14.580591 (Mratinsky potok)
Observer: sumie-dh
Biotope: benthos, under stones
River: Mratínský potok - Labe
Bedrock: Loess, Cretaceous sandstone and marl
Microscope: Novex stereomicroscope P-20 (bright field)
Amplification: 20x
Collecting method: manual - brush
Description: Two specimens of this species was found in fast flowing brook with stones and sandy ground. No other planarian species was found on this locality.
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