| Polycelis | |
|---|---|
 | |
| Polycelis nigra | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Platyhelminthes |
| Class: | Rhabditophora |
| Order: | Tricladida |
| Family: | Planariidae |
| Genus: | Polycelis Ehrenberg, 1831 |
| Synonyms [1] | |
| |
Polycelis is a genus of planarians in the family Planariidae. [1] The genus was described in 1831 by Christian Gottfried Ehrenberg [1] and currently has no consensus on the exact number of species.
The following species are recognised in the genus Polycelis: [2]
The cryptophyceae are a class of algae, most of which have plastids. About 220 species are known, and they are common in freshwater, and also occur in marine and brackish habitats. Each cell is around 10–50 μm in size and flattened in shape, with an anterior groove or pocket. At the edge of the pocket there are typically two slightly unequal flagella.
Hexabranchidae is a monotypic family of colorful nudibranchs which contains only a single genus Hexabranchus, with two species, and has no subfamilies.
The Chromodorididae, or chromodorids, are a taxonomic family of colourful, sea slugs; dorid nudibranchs, marine gastropod mollusks in the superfamily Doridoidea. “Chromodorid nudibranchs are among the most gorgeously coloured of all animals.” The over 360 described species are primarily found in tropical and subtropical waters, as members of coral reef communities, specifically associated with their sponge prey. The chromodorids are the most speciose family of opisthobranchs. They range in size from <10mm to over 30 cm, although most species are approximately 15–30 mm in size.
The Facelinidae are a taxonomic family of colorful sea slugs. These are specifically aeolid nudibranchs. They are marine gastropod molluscs.
Actinocyclidae is a family of sea slugs, dorid nudibranchs, marine gastropod mollusks in the superfamily Doridoidea. This family is within the clade Euctenidiacea.
Phyllodesmium is a genus of predatory sea slugs, aeolid nudibranchs, marine gastropod molluscs in the family Facelinidae.
Actinocyclus is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod molluscs in the family Actinocyclidae.
Otinodoris is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod mollusks previously placed in the family Chromodorididae. It is now considered a synonym of Asteronotus Ehrenberg, 1831 and placed in the family Discodorididae
Asteronotus is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod molluscs in the family Discodorididae.
Lacrymaria is a genus of ciliates. Its best known species is the "Tear of Swan", Lacrymaria olor.
Phyllodesmium hyalinum is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.
The genus Bacterium was a taxon described in 1828 by Christian Gottfried Ehrenberg. The type species was later changed from Bacterium triloculare to Bacterium coli as it was lost. In 1951 and then in 1954 it was recognised as a nomen generum rejiciendum, which means a generic name to be rejected; this also applied to its family Bacteriaceae.
Actinocyclus verrucosus is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Actinocyclidae.
Gyratrix is a genus of flatworms belonging to the family Polycystididae.
Colurella is a genus of rotifers belonging to the family Lepadellidae.
Meridion is a genus of diatoms belonging to the family Fragilariaceae.
Epiphanes is a genus of rotifers belonging to the family Epiphanidae.
Amphiporus is a genus of nemerteans belonging to the family Amphiporidae.
Tetrastemma is a genus of nemerteans belonging to the family Tetrastemmatidae.
Zootecus is a genus of gastropods belonging to the family Achatinidae.