Rotaria is a genus of asexual, microscopic animal known as a bdelloid rotifer. Analysis published in 2007 of morphology and DNA sequence data of species from the genus confirmed that despite their asexual mechanism of reproduction, two fundamental properties of species, independent evolution and ecological divergence by natural selection occurred. This demonstrates that sex is not a necessary condition for speciation.^[2]

Rotaria
(A) R. neptunia, lateral view; (B) R. macrura, ventral view; (C) R. tardigrada, dorsal view; (D) R. sordida, lateral view; and (E) trophi of R. tardigrada
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Rotifera
Class:	Bdelloidea
Order:	Bdelloida
Family:	Philodinidae
Genus:	Rotaria Scopoli, 1777
Species
Rotaria citrina Rotaria macrura Rotaria magnacalcarata Rotaria neptunia Rotaria neptunoida Rotaria rotatoria Rotaria socialis Rotaria sordida Rotaria tardigrada Rotaria sp. CWB-2005[1]
Synonyms
Rotifer vulgaris = Rotaria rotatoria