Finlay j.b. ,g.f.esteban & t. fenchel (1998) .protozoan diversity.converging estimates of the global number of free living ciliate species .protist , (149).29-37
ZOO 115 Invertebrate Zoology Nematoda. Phylum Nematoda Common name: round worms >20,000 species. Mostly widespread and abundant of all metazoans 90,000.
