| Species aggregate | Polycelis nigra or tenuis (a species aggregate of flatworms) |
| Genus | Polycelis (a genus of flatworms) |
| Family | PLANARIIDAE (a family of flatworms) |
| Infraorder | Paludicola (an infraorder of flatworms) |
| Order | TRICLADIDA |
| Class | RHABDITOPHORA (a class of flatworms) |
| Phylum | PLATYHELMINTHES (flatworms, tapeworms, flukes) |
| Superphylum | PROTOSTOMIA (protostomes) |
| Clade | Bilateria (bilaterally symmetrical animals) |
| Subkingdom | EUMETAZOA (metazoans) |
| Kingdom | ANIMALIA (animals) |
| Domain | Eukaryota (eukaryotes) |
| Life | BIOTA (living things) |
| Records of Polycelis nigra or tenuis (a species aggregate of flatworms) : | ||||
| 1: Polycelis nigra or tenuis (a species aggregate of flatworms) | ||||
| 12 Feb 2022 | OSGR: SY67 | 50° 30’ N, 2° 30’ W | Vice County: Dorset (VC 9) | England |
| One of several dark grey specimens, found in watering can after filling at council tank. | ||||
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| 2: Polycelis nigra or tenuis (a species aggregate of flatworms) | ||||
| 22 Oct 2008 | OSGR: ST44 | 51° 10’ N, 2° 50’ W | Vice County: North Somerset (VC 6) | England |
| in shaded ditch, under trees | ||||
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Polycelis nigra or tenuis (a species aggregate of flatworms) may be included in identification literature listed under the following higher taxa:
 NBN (data.nbn.org.uk)
has a distribution map for Polycelis nigra or tenuis (a species aggregate of flatworms)
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 BioInfo (www.bioinfo.org.uk)
has 0 host/parasite/foodplant and/or other relationships for Polycelis nigra or tenuis (a species aggregate of flatworms)
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